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Little Ice Age

From Wikipedia, the free encyclopedia

Global average temperatures show that the Little Ice Age was not a distinct planet-wide time period, but the end of a long temperature decline that preceded recent global warming.[1]
Global average temperatures show that the Little Ice Age was not a distinct planet-wide time period, but the end of a long temperature decline that preceded recent global warming.[1]

The Little Ice Age (LIA) was a period of regional cooling that occurred after the Medieval Warm Period.[2] It was not a true ice age of global extent. The term was introduced into scientific literature by François E. Matthes in 1939.[3] The time period has been conventionally defined as extending from the 16th to the 19th centuries,[4][5][6] but some experts prefer an alternative timespan from about 1300[7] to about 1850.[8][9][10]

The NASA Earth Observatory notes three particularly cold intervals: one beginning about 1650, another about 1770, and the last in 1850, all separated by intervals of slight warming.[6] The Intergovernmental Panel on Climate Change Third Assessment Report considered that the timing and areas affected by the Little Ice Age suggested largely independent regional climate changes rather than a globally synchronous increased glaciation. At most, there was modest cooling of the Northern Hemisphere during the period.[11]

Several causes have been proposed: cyclical lows in solar radiation, heightened volcanic activity, changes in the ocean circulation, variations in Earth's orbit and axial tilt (orbital forcing), inherent variability in global climate, and decreases in the human population (for example from the Black Death and the epidemics emerging in the Americas upon European contact[12]).

Areas involved

The Intergovernmental Panel on Climate Change Third Assessment Report (TAR) of 2001 described the areas affected:

Evidence from mountain glaciers does suggest increased glaciation in a number of widely spread regions outside Europe prior to the twentieth century, including Alaska, New Zealand and Patagonia. However, the timing of maximum glacial advances in these regions differs considerably, suggesting that they may represent largely independent regional climate changes, not a globally-synchronous increased glaciation. Thus current evidence does not support globally synchronous periods of anomalous cold or warmth over this interval, and the conventional terms of "Little Ice Age" and "Medieval Warm Period" appear to have limited utility in describing trends in hemispheric or global mean temperature changes in past centuries.... [Viewed] hemispherically, the "Little Ice Age" can only be considered as a modest cooling of the Northern Hemisphere during this period of less than 1°C relative to late twentieth century levels.[11]

The IPCC Fourth Assessment Report (AR4) of 2007 discusses more recent research, giving particular attention to the Medieval Warm Period:

...when viewed together, the currently available reconstructions indicate generally greater variability in centennial time scale trends over the last 1 kyr than was apparent in the TAR.... The result is a picture of relatively cool conditions in the seventeenth and early nineteenth centuries and warmth in the eleventh and early fifteenth centuries, but the warmest conditions are apparent in the twentieth century. Given that the confidence levels surrounding all of the reconstructions are wide, virtually all reconstructions are effectively encompassed within the uncertainty previously indicated in the TAR. The major differences between the various proxy reconstructions relate to the magnitude of past cool excursions, principally during the twelfth to fourteenth, seventeenth and nineteenth centuries.[13]

Dating

The last written records of the Norse Greenlanders are from a 1408 marriage at Hvalsey Church, now the best-preserved of the Norse ruins.
The last written records of the Norse Greenlanders are from a 1408 marriage at Hvalsey Church, now the best-preserved of the Norse ruins.

There is no consensus regarding the time when the Little Ice Age began,[14][15] but a series of events before the known climatic minima has often been referenced. In the 13th century, pack ice began advancing southwards in the North Atlantic, as did glaciers in Greenland. Anecdotal evidence suggests expanding glaciers almost worldwide. Based on radiocarbon dating of roughly 150 samples of dead plant material with roots intact, collected from beneath ice caps on Baffin Island and Iceland, Miller et al. (2012)[7] state that cold summers and ice growth began abruptly between 1275 and 1300, followed by "a substantial intensification" from 1430 to 1455.[7]

In contrast, a climate reconstruction based on glacial length[16][17] shows no great variation from 1600 to 1850 but strong retreat thereafter.

Therefore, any of several dates ranging over 400 years may indicate the beginning of the Little Ice Age:

  • 1250 for when Atlantic pack ice began to grow; cold period possibly triggered or enhanced by the massive eruption of Samalas volcano in 1257[18]
  • 1275 to 1300 based on the radiocarbon dating of plants killed by glaciation
  • 1300 for when warm summers stopped being dependable in Northern Europe
  • 1315 for the rains and Great Famine of 1315–1317
  • 1560 to 1630 for beginning of worldwide glacial expansion known as the Grindelwald Fluctuation[19]
  • 1650 for the first climatic minimum.

The Little Ice Age ended in the latter half of the 19th century or early in the 20th century.[20][21][22]

Geophysical and social impact by region

Europe

The Frozen Thames, 1677
The Frozen Thames, 1677

The Baltic Sea froze over twice, 1303 and 1306–07; years followed of "unseasonable cold, storms and rains, and a rise in the level of the Caspian Sea.”[23] The Little Ice Age brought colder winters to parts of Europe and North America. Farms and villages in the Swiss Alps were destroyed by encroaching glaciers during the mid-17th century.[24] Canals and rivers in Great Britain and the Netherlands were frequently frozen deeply enough to support ice skating and winter festivals.[24] The first River Thames frost fair was in 1608 and the last in 1814; changes to the bridges and the addition of the Thames Embankment affected the river flow and depth, greatly diminishing the possibility of further freezes.[25] In 1658, a Swedish army marched across the Great Belt to Denmark to attack Copenhagen. The winter of 1794–1795 was particularly harsh: the French invasion army under Pichegru was able to march on the frozen rivers of the Netherlands, and the Dutch fleet was locked in the ice in Den Helder harbour.

Sea ice surrounding Iceland extended for miles in every direction, closing harbors to shipping. The population of Iceland fell by half, but that may have been caused by skeletal fluorosis after the eruption of Laki in 1783.[26] Iceland also suffered failures of cereal crops and people moved away from a grain-based diet.[27] The Norse colonies in Greenland starved and vanished by the early 15th century, as crops failed and livestock could not be maintained through increasingly harsh winters. Greenland was largely cut off by ice from 1410 to the 1720s.[28]

Winter skating on the main canal of Pompenburg, Rotterdam in 1825, shortly before the minimum, by Bartholomeus Johannes van Hove
Winter skating on the main canal of Pompenburg, Rotterdam in 1825, shortly before the minimum, by Bartholomeus Johannes van Hove

In his 1995 book the early climatologist Hubert Lamb said that in many years, "snowfall was much heavier than recorded before or since, and the snow lay on the ground for many months longer than it does today."[29] In Lisbon, Portugal, snowstorms were much more frequent than today; one winter in the 17th century produced eight snowstorms.[30] Many springs and summers were cold and wet but with great variability between years and groups of years. This was particularly evident during the 'Grindelwald Fluctuation' (1560–1630): a rapid cooling phase that was associated with more erratic weather – including increased storminess, unseasonal snow storms and droughts.[31] Crop practices throughout Europe had to be altered to adapt to the shortened, less reliable growing season, and there were many years of dearth and famine (such as the Great Famine of 1315–1317, but that may have been before the Little Ice Age).[32] According to Elizabeth Ewan and Janay Nugent, "Famines in France 1693–94, Norway 1695–96 and Sweden 1696–97 claimed roughly 10 percent of the population of each country. In Estonia and Finland in 1696–97, losses have been estimated at a fifth and a third of the national populations, respectively."[33] Viticulture disappeared from some northern regions and storms caused serious flooding and loss of life. Some of them resulted in permanent loss of large areas of land from the Danish, German, and Dutch coasts.[29]

The violin maker Antonio Stradivari produced his instruments during the Little Ice Age. The colder climate is proposed to have caused the wood used in his violins to be denser than in warmer periods, contributing to the tone of his instruments.[34] According to the science historian James Burke, the period inspired such novelties in everyday life as the widespread use of buttons and button-holes, and knitting of custom-made undergarments to better cover and insulate the body. Chimneys were invented to replace open fires in the centre of communal halls, so allowing houses with multiple rooms, separation of masters from servants.[35]

The Little Ice Age, by anthropologist Brian Fagan of the University of California at Santa Barbara, tells of the plight of European peasants during the 1300 to 1850 chill: famines, hypothermia, bread riots and the rise of despotic leaders brutalizing an increasingly dispirited peasantry. In the late 17th century, agriculture had dropped off dramatically: "Alpine villagers lived on bread made from ground nutshells mixed with barley and oat flour."[36] Historian Wolfgang Behringer has linked intensive witch-hunting episodes in Europe to agricultural failures during the Little Ice Age.[37]

The Frigid Golden Age, by environmental historian Dagomar Degroot of Georgetown University, by contrast, reveals that some societies thrived while others faltered during the Little Ice Age. In particular, the Little Ice Age transformed environments around the Dutch Republic – the precursor to the present-day Netherlands –  so that they were easier to exploit in commerce and conflict. The Dutch were resilient, even adaptive, in the face of weather that devastated neighboring countries. Merchants exploited harvest failures, military commanders took advantage of shifting wind patterns, and inventors developed technologies that helped them profit from the cold. The 17th-century "Golden Age" of the Republic therefore owed much to the flexibility of the Dutch in coping with a changing climate.[38]

Cultural responses

Historians have argued that cultural responses to the consequences of the Little Ice Age in Europe consisted of violent scapegoating.[39][40][41][37][42] The prolonged cold, dry periods brought drought upon many European communities, resulting in poor crop growth, poor livestock survival, and increased activity of pathogens and disease vectors.[43] Disease tends to intensify under the same conditions that unemployment and economic difficulties arise: prolonged, cold, dry seasons. Both of these outcomes – disease and unemployment – enhance each other, generating a lethal positive feedback loop.[43] Although these communities had some contingency plans, such as better crop mixes, emergency grain stocks, and international food trade, these did not always prove effective.[39] Communities often lashed out via violent crimes, including robbery and murder; sexual offense accusations increased as well, such as adultery, bestiality, and rape.[40] Europeans sought explanations for the famine, disease, and social unrest that they were experiencing, and blamed the innocent. Evidence from several studies indicate that increases in violent actions against marginalized groups that were held responsible for the Little Ice Age overlap with years of particularly cold, dry weather.[41][37][39]

One example of the violent scapegoating occurring during the Little Ice Age was the resurgence of witchcraft trials, as argued by Oster (2004) and Behringer (1999). Oster and Behringer argue that this resurgence was brought upon by the climatic decline. Prior to the Little Ice Age, "witchcraft" was considered an insignificant crime and victims were rarely accused.[37] But beginning in the 1380s, just as the Little Ice Age began, European populations began to link magic and weather-making.[37] The first systematic witch hunts began in the 1430s, and by the 1480s it was widely believed that witches should be held accountable for poor weather.[37] Witches were blamed for direct and indirect consequences of the Little Ice Age: livestock epidemics, cows that gave too little milk, late frosts, and unknown diseases.[40] In general, as the temperature dropped, the number of witchcraft trials rose, and trials decreased when temperature increased.[39][37] The peaks of witchcraft persecutions overlap with hunger crises that occurred in 1570 and 1580, the latter lasting a decade.[37] These trials primarily targeted poor women, many of whom were widows. Not everybody agreed that witches should be persecuted for weather-making, but such arguments primarily focused not upon whether witches existed, but upon whether witches had the capability to control the weather.[37][39] The Catholic Church in the Early Middle Ages argued that witches could not control the weather because they were mortals, not God, but by the mid-13th-century most populations agreed with the idea that witches could control natural forces.[39]

Historians have argued that Jewish populations were also blamed for climatic deterioration during the Little Ice Age.[40][42] Christianity was the official religion of Western Europe, and within these populations there was a great degree of anti-Semitism.[40] There was no direct link made between Jews and weather conditions, they were only blamed for indirect consequences such as disease.[40] For example, outbreaks of the plague were often blamed on Jews; in Western European cities during the 1300s Jewish populations were murdered in an attempt to stop the spread of the plague.[40] Rumors were spread that either Jews were poisoning wells themselves, or conspiring against Christians by telling those with leprosy to poison the wells.[40] As a response to such violent scapegoating, Jewish communities sometimes converted to Christianity or migrated to the Ottoman Empire, Italy, or to territories of the Holy Roman Empire.[40]

Some populations blamed the cold periods and the resulting famine and disease during the Little Ice Age on general divine displeasure.[41] Particular groups, however, took the brunt of the burden in attempts to cure it.[41] For example, in Germany, regulations were imposed upon activities such as gambling and drinking, which disproportionately affected the lower class, and women were forbidden from showing their knees.[41] Other regulations affected the wider population, such as prohibiting dancing and sexual activities, as well as moderating food and drink intake.[41]

In Ireland, Catholics blamed the Reformation for the bad weather. The Annals of Loch Cé, in its entry for the year 1588, describes a midsummer snowstorm: "a wild apple was not larger than each stone of it," blaming it on the presence of a "wicked, heretical, bishop in Oilfinn"; that is, the Protestant Bishop of Elphin, John Lynch.[44][45]

Depictions of winter in European painting

William James Burroughs analyses the depiction of winter in paintings, as does Hans Neuberger.[46] Burroughs asserts that it occurred almost entirely from 1565 to 1665 and was associated with the climatic decline from 1550 onwards. Burroughs claims that there had been almost no depictions of winter in art, and he "hypothesizes that the unusually harsh winter of 1565 inspired great artists to depict highly original images and that the decline in such paintings was a combination of the 'theme' having been fully explored and mild winters interrupting the flow of painting".[47] Wintry scenes, which entail technical difficulties in painting, have been regularly and well handled since the early 15th century by artists in illuminated manuscript cycles showing the Labours of the Months, typically placed on the calendar pages of books of hours. January and February are typically shown as snowy, as in February in the famous cycle in the Les Très Riches Heures du duc de Berry, painted 1412–1416 and illustrated below. Since landscape painting had not yet developed as an independent genre in art, the absence of other winter scenes is not remarkable. On the other hand, snowy winter landscapes and stormy seascapes in particular became artistic genres in the Dutch Republic during the coldest and stormiest decades of the Little Ice Age. At the time when the Little Ice Age was at its height, Dutch observations and reconstructions of similar weather in the past caused artists to consciously paint local manifestations of a cooler, stormier climate. This was a break from European conventions as Dutch paintings and realistic landscapes depicted scenes from everyday life, which most modern scholars believe that were full of symbolic messages and metaphors that would have been clear to contemporary customers.[48]

The famous winter landscape paintings by Pieter Brueghel the Elder, such as The Hunters in the Snow, are all thought to have been painted in 1565. His son Pieter Brueghel the Younger (1564–1638) also painted many snowy landscapes, but according to Burroughs, he "slavishly copied his father's designs. The derivative nature of so much of this work makes it difficult to draw any definite conclusions about the influence of the winters between 1570 and 1600...".[47][49]

Winter landscape with iceskaters, c. 1608, Hendrick Avercamp
Winter landscape with iceskaters, c. 1608, Hendrick Avercamp

Burroughs says that snowy subjects return to Dutch Golden Age painting with works by Hendrick Avercamp from 1609 onwards. There is then a hiatus between 1627 and 1640, before the main period of such subjects from the 1640s to the 1660s, which relates well with climate records for the later period. The subjects are less popular after about 1660, but that does not match any recorded reduction in severity of winters and may reflect only changes in taste or fashion. In the later period between the 1780s and 1810s, snowy subjects again became popular.[47]

Neuberger analysed 12,000 paintings, held in American and European museums and dated between 1400 and 1967, for cloudiness and darkness.[46] His 1970 publication shows an increase in such depictions that corresponds to the Little Ice Age,[46] peaking between 1600 and 1649.[50]

Paintings and contemporary records in Scotland demonstrate that curling and ice skating were popular outdoor winter sports, with curling dating back to the 16th century and becoming widely popular in the mid-19th century.[51] As an example, an outdoor curling pond constructed in Gourock in the 1860s remained in use for almost a century, but increasing use of indoor facilities, problems of vandalism, and milder winters led to the pond being abandoned in 1963.[52]

General Crisis of the Seventeenth Century

The General Crisis of the Seventeenth Century in Europe was a period of inclement weather, crop failure, economic hardship, extreme inter-group violence, and high mortality causally linked to the Little Ice Age. Episodes of social instability track the cooling with a time lapse of up to 15 years, and many developed into armed conflicts, such as the Thirty Years' War (1618–1648).[53] It started as a war of succession to the Bohemian throne. Animosity between Protestants and Catholics in the Holy Roman Empire (Germany today) added fuel to the fire. Soon, it escalated to a huge conflict involving all major European powers that devastated much of Germany. By the war's end, some regions of the Holy Roman Empire saw their population drop by as much as 70%.[54] But as global temperatures started to rise, the ecological stress faced by Europeans also began to fade. Mortality rates dropped and the level of violence fell, paving the way for a period known as Pax Britannica, which witnessed the emergence of a variety of innovations in technology (which enabled industrialization), medicine (which improved hygiene), and social welfare (such as the world's first welfare programs in Germany), making life even more comfortable.[55]

North America

"February" from the calendar of Les Très Riches Heures du duc de Berry, 1412–1416
"February" from the calendar of Les Très Riches Heures du duc de Berry, 1412–1416

Early European explorers and settlers of North America reported exceptionally severe winters. For example, according to Lamb, Samuel Champlain reported bearing ice along the shores of Lake Superior in June 1608. Both Europeans and indigenous peoples suffered excess mortality in Maine during the winter of 1607–1608, and extreme frost was reported in the Jamestown, Virginia, settlement at the same time.[29] Native Americans formed leagues in response to food shortages.[28] The journal of Pierre de Troyes, Chevalier de Troyes, who led an expedition to James Bay in 1686, recorded that the bay was still littered with so much floating ice that he could hide behind it in his canoe on 1 July.[56] In the winter of 1780, New York Harbor froze, allowing people to walk from Manhattan Island to Staten Island.

The extent of mountain glaciers had been mapped by the late 19th century. In the north and the south temperate zones, Equilibrium Line Altitude (the boundaries separating zones of net accumulation from those of net ablation) were about 100 metres (330 ft) lower than they were in 1975.[57] In Glacier National Park, the last episode of glacier advance came in the late 18th and the early 19th centuries.[58] In 1879, famed naturalist John Muir found that Glacier Bay ice had retreated 48 miles. In Chesapeake Bay, Maryland, large temperature excursions were possibly related to changes in the strength of North Atlantic thermohaline circulation.[59]

Because the Little Ice Age took place during the European colonization of the Americas, it threw off a lot of the early colonizers. The colonizers had expected the climate of North America to be similar to the climate of Europe at similar latitudes, however the climate of North America had hotter summers and colder winters than were expected by the Europeans. This was an effect aggravated by the Little Ice Age. This unpreparedness led to the collapse of many early European settlements in North America.

When colonizers settled at Jamestown, in modern day Virginia, historians agree it was one of the coldest time periods in the last 1000 years. Droughts were also a huge problem in North America during the Little Ice Age, settlers arriving in Roanoke were in the largest drought of the past 800 years. Tree ring studies done by the University of Arkansas discovered that many colonists arrived at the beginning of a seven year drought. These times of drought also decreased Native American populations and led to conflict due to food scarcity. English colonists at Roanoke forced Native Americans of Ossomocomuck to share their depleted supplies with them. This led to warfare between the two groups and Native American cities were destroyed. That cycle would repeat itself many times at Jamestown. The combination of fighting and cold weather led to the spread of diseases as well. The colder weather brought on by the Little Ice Age helped the Malaria parasites brought by Europeans in mosquitoes develop faster. This in turn led to many deaths among Native American populations.[60]

Cold winters made worse by the Little Ice Age were also an issue in North America for colonists. Anecdotal evidence shows that people who lived in North America suffered during this time. John Smith, who established Jamestown, Virginia, wrote of a winter so cold, not even the dogs could bear it. Another colonist, Francis Perkins, wrote in the Winter of 1607 that it got so cold that the river at his fort froze due to extremely cold weather. In 1642, Thomas Gorges wrote that between 1637 and 1645, colonists in Maine in Massachusetts had horrendous weather conditions. June of 1637 was so hot that European newcomers were dying in the heat and travelers had to travel at night to stay cool enough. He also wrote that the winter of 1641–1642 was “piercingly Intolerable” and that no Englishman nor Native American had ever seen anything like it. Stating that the Massachusetts bay had frozen as far as one could see and that horse carriages now roamed where ships used to be. The summers of 1638 and 1639 were very short, cold, and wet according to Gorges and this led to compounding food scarcity for a few years. To make matters worse, creatures like caterpillars and pigeons were feeding on crops and devastating harvests. Every year that Gorges writes about, he notes unusual weather patterns that include high precipitation, drought, and extreme cold or extreme heat. These all are byproducts of the Little Ice Age.[61]

While the Little Ice Age dropped global temperatures by an estimated 0.1 degrees celsius, it increased global weirding all over North America and the world. Summers got hotter and winters got colder. Floods ensued and so did droughts. The Little Ice age didn’t just cool places off a bit, it threw the climate into a weird unpredictable beast that made living in North America significantly harder for all of its inhabitants.

While nobody knows exactly what caused the Little Ice Age, one theory from Warren Ruddimen states that approximately 50% of the Little Ice Age originated in North America. This theory states that when European diseases wiped out 95 percent of Native Americans, the resulting effects led to global cooling. Approximately 55 million Native Americans died due to those diseases and the theory is that as a result of those deaths, 56 million hectares of land was abandoned and reforested. Ruddimen believes that this caused more oxygen to enter the air and then created a global cooling effect.[62]

Many of the people living in North America had their own theories as to why the weather was so poor. Colonist Ferdinando Gorges blamed the cold weather on cold ocean winds. Humphrey Gilbert tried to explain the extremely cold and foggy weather of Newfoundland by saying the earth drew cold vapors from the ocean and drew them west. Dozens of others had their own theories as to why North America was so much colder than Europe. But because of their observations and hypotheses, we know a lot about the Little Ice Age’s effect on North America.[63]

Mesoamerica

An analysis of several climate proxies undertaken in Mexico's Yucatán Peninsula, linked by its authors to Maya and Aztec chronicles relating periods of cold and drought, supports the existence of the Little Ice Age in the region.[64]

Another study conducted in several sites in Mesoamerica such as Los Tuxtlas and Lake Pompal in Veracruz, Mexico demonstrate a decrease in human activity in the area during the Little Ice Age. This was proven by studying charcoal fragments and the amount of maize pollen taken from sedimentary samples using a nonrotatory piston corer. The samples also showed volcanic activity which caused forest regeneration between 650 and 800. The instances of volcanic activity near Lake Pompal indicate varying temperatures, not a continuous coldness, during the Little Ice Age in Mesoamerica.[65]

Atlantic Ocean

In the North Atlantic, sediments accumulated since the end of the last ice age, nearly 12,000 years ago, show regular increases in the amount of coarse sediment grains deposited from icebergs melting in the now open ocean, indicating a series of 1–2 °C (2–4 °F) cooling events recurring every 1,500 years or so.[66] The most recent of these cooling events was the Little Ice Age. These same cooling events are detected in sediments accumulating off Africa, but the cooling events appear to be larger, ranging between 3–8 °C (6–14 °F).[67]

Asia

Although the original designation of a Little Ice Age referred to reduced temperature of Europe and North America, there is some evidence of extended periods of cooling outside this region, but it is not clear whether they are related or independent events. Mann states:[4]

While there is evidence that many other regions outside Europe exhibited periods of cooler conditions, expanded glaciation, and significantly altered climate conditions, the timing and nature of these variations are highly variable from region to region, and the notion of the Little Ice Age as a globally synchronous cold period has all but been dismissed.

In China, warm-weather crops such as oranges were abandoned in Jiangxi Province, where they had been grown for centuries.[68] Also, the two periods of most frequent typhoon strikes in Guangdong coincide with two of the coldest and driest periods in northern and central China (1660–1680, 1850–1880).[69] Scholars have argued that the fall of the Ming dynasty may have been partially caused by the droughts and famines caused by the Little Ice Age.[70]

There are debates on the start date and time periods of Little Ice Age's effects. Most scholars agree on categorizing the Little Ice Age period into 3 distinct cold periods. 1458–1552, 1600–1720, and 1840–1880.[71] According to data from the National Oceanic and Atmospheric Administration, the Eastern Monsoon area of China was the earliest to experience the effects of Little Ice Age from 1560–1709. In the Western region of China surrounding the Tibetan Plateau, the effects of Little Ice Age lagged behind the Eastern region, with significant cold periods between 1620 and 1749.[72]

The temperature changes was unprecedented for the farming communities in China. According to Dr. Coching Chu's 1972 study, the Little Ice Age during the end of Ming Dynasty and start of Qing Dynasty (1650–1700) was one of the coldest periods in recorded Chinese history.[73] Many major droughts during summer months were recorded while significant freezing events occurred in Winter months, hurting the food supply significantly during Ming Dynasty.

This period of Little Ice Age would correspond to major historical events of the period. The Jurchen people resided in Northern China and formed a tributary state to the Ming government and Wanli Emperor. From 1573 to 1620, the Manchurian land experienced famine experienced extreme snowfall, which depleted agriculture production and decimated the livestock population. Scholars argued that this was caused by the temperature drops during Little Ice Age. Despite the lack of food production, Wanli Emperor ordered the Jurchens to pay the same amount of tribute each year. This led to anger and sowed seeds to the rebellion against Ming China. In 1616, Jurchens established the Later Jin dynasty. Led by Hong Taiji and Nurhaci, the Later Jin dynasty moved South and achieved decisive victories in battles against the Ming military such as the Battle of Fushun in 1618.[74]

Following the earlier defeats and the death of Wanli Emperor, Chongzhen Emperor took the reign of China and continued the war effort. From 1632 to 1641, the Little Ice Age climate began to cause drastic climate changes in Ming territories. For example, rainfall in Huabei region dropped by 11% ~ 47% compared to historical average. Meanwhile, the Shaanbei region along the Yellow River experienced six major floods that ruined cities such as Yan’an. The climate factored heavily in weakening the Imperial government’s control over China and accelerated the fall of Ming dynasty. In 1644, Li Zicheng led Later Jin forces into Beijing, overthrowing the Ming Dynasty, and establishing the Qing Dynasty.[75]

During the early years of the Qing Dynasty, the little ice age continued to have a significant impact on Chinese society. During the rule of Kangxi Emperor (1661–1722), majority of the Qing territories were still much colder than the historical average. However, Kangxi Emperor pushed reforms and managed to increase socioeconomic recovery from the natural disasters, partially benefiting from the peacefulness of the early Qing dynasty. This essentially marked the end of the Little Ice Age in China and led to a more affluent era of Chinese monarchial history known as the High Qing era.[76]

In the Himalayas, the general assumption is that the cooling events in the Himalayas were synchronous with cooling events in Europe during the Little Ice Age based on the characteristics of moraines. However, applications of Quaternary dating methods such as surface exposure dating demonstrated that glacial maxima occurred between 1300 and 1600, which was slightly earlier than the recorded coldest period in Northern Hemisphere. Many large Himalayan glacial debris remained close to their limits from the Little Ice Age to present. The Himalayas also experienced increase in snowfall at higher altitudes, resulting in a southward shift in the Indian summer monsoon and an increase in precipitation. Overall, the increase in winter precipitation may have caused some glacial movements.[77]

In Pakistan, the Balochistan province became colder and the native Baloch people started mass migration and settled along the Indus River in Sindh and Punjab provinces.[78]

Africa

The influence of the Little Ice Age on African climate has been clearly demonstrated throughout the 14th-19th century.[79] Despite variances throughout the continent, a general trend of declining temperatures led to an average cooling of 1 °C in the continent.[80]

In Ethiopia and North Africa, permanent snow was reported on mountain peaks at levels where it does not occur today.[68] Timbuktu, an important city on the trans-Saharan caravan route, was flooded at least 13 times by the Niger River; there are no records of similar flooding before or since.[68]

Several paleoclimatic studies of Southern Africa have suggested significant changes in relative changes in climate and environmental conditions. In Southern Africa, sediment cores retrieved from Lake Malawi show colder conditions between 1570 and 1820, suggesting the Lake Malawi records "further support, and extend, the global expanse of the Little Ice Age."[81] A novel 3,000-year temperature reconstruction method, based on the rate of stalagmite growth in a cold cave in South Africa, further suggests a cold period from 1500 to 1800 "characterizing the South African Little Ice age."[82] This δ18O stalagmite record temperature reconstruction over a 350-year period (1690–1740) suggests that South Africa may have been the coldest region in Africa, cooling as much as 1.4 °C in the Summer.[83] Further, solar magnetic and Niño-Southern Oscillation cycle may have been key drivers of climate variability in the subtropical region. Periglacial features in the eastern Lesotho Highlands might have been reactivated by the Little Ice Age.[84] Another archaeological reconstruction of South Africa reveals the rise of the Great Zimbabwe people society due to ecological advantages due to increased rainfall over other competitor societies’ such as the Mupungubwe people.[85]

Aside from temperature variability, data from equatorial East Africa suggests impacts to the hydrologic cycle in the late 1700s. Historical data reconstructions from ten major African lakes indicate an episode of “drought and desiccation” occurred throughout East Africa.[86] This period showed drastic reductions in lake depth as these were transformed into desiccated puddles. It is very likely that locals could traverse lake Chad, among others, and bouts of “intense droughts were ubiquitous”. These predictors indicate local societies were probably launched into long migrations and warfare with neighboring tribes as agriculture was rendered virtually useless by the arid soil conditions.

Antarctica

CO2 mixing ratios at Law Dome
CO
2
mixing ratios at Law Dome

Kreutz et al. (1997) compared results from studies of West Antarctic ice cores with the Greenland Ice Sheet Project Two GISP2 and suggested a synchronous global cooling.[87] An ocean sediment core from the eastern Bransfield Basin in the Antarctic Peninsula shows centennial events that the authors link to the Little Ice Age and Medieval Warm Period.[88] The authors note "other unexplained climatic events comparable in duration and amplitude to the LIA and MWP events also appear."

The Siple Dome (SD) had a climate event with an onset time that is coincident with that of the Little Ice Age in the North Atlantic based on a correlation with the GISP2 record. The event is the most dramatic climate event in the SD Holocene glaciochemical record.[89] The Siple Dome ice core also contained its highest rate of melt layers (up to 8%) between 1550 and 1700, most likely because of warm summers.[90] Law Dome ice cores show lower levels of CO
2
mixing ratios from 1550 to 1800, which Etheridge and Steele conjecture are "probably as a result of colder global climate."[91]

Sediment cores in Bransfield Basin, Antarctic Peninsula, have neoglacial indicators by diatom and sea-ice taxa variations during the Little Ice Age.[92] Stable isotope records from the Mount Erebus Saddle ice core site suggests that the Ross Sea region experienced 1.6 ± 1.4 °C cooler average temperatures during the Little Ice Age, compared to the last 150 years.[93]

Australia and New Zealand

Due to its location in the Southern Hemisphere, Australia did not experience a regional cooling as in Europe or North America. Instead, the Australian Little Ice Age was characterized by humid, rainy climates followed by drying and aridification in the nineteenth century.[94]

As studied by Tibby et al. (2018), lake records from Victoria, New South Wales, and Queensland suggest that conditions in the east and south-east of Australia were wet and unusually cool from the sixteenth to early nineteenth centuries. This corresponds with the “peak” of the global Little Ice Age from 1594–1722. For example, the Swallow Lagoon rainfall record indicates that from c. 1500–1850, there was significant and consistent rainfall, sometimes exceeding 300 millimeters.[94] These rainfalls significantly reduced after circa 1890. Similarly, the hydrological records of Lake Surprise’s salinity levels reveal high humidity levels from circa 1440–1880, while an increase in salinity between 1860–1880 point to a negative change to the once-humid climate.[95] The mid-nineteenth century marked a notable change to east Australia’s rainfall and humidity patterns.

As Tibby et al. (2018) note, in eastern Australia, these paleoclimatic changes of the Little Ice Age in the late 1800s coincided with the agricultural changes resulting from European colonization. Following the 1788 establishment of British colonies on the Australian continent – primarily concentrated in eastern regions and cities like Sydney, and later Melbourne and Brisbane – the British introduced new agricultural practices such as pastoralism.[94] Practices such as these required widespread deforestation and vegetation clearance. Pastoralism and land clearing is captured in works of art such as prominent landscape artist John Glover’s 1833 painting, Patterdale Landscape with Cattle.

Patterdale Landscape with Cattle (1833) by John Glover depicts agricultural practices like pastoralism, which contributed to the aridification of Australia's late Little Ice Age.
Patterdale Landscape with Cattle (1833) by John Glover depicts agricultural practices like pastoralism, which contributed to the aridification of Australia's late Little Ice Age.

Over the next century, such deforestation led to biodiversity loss, wind and water-based soil erosion, and soil salinity.[96] Furthermore, as argued by Gordan et al. (2003), such land and vegetation clearance in Australia resulted in a 10% reduction in water vapor transport to the atmosphere. This occurred in western Australia as well, in which nineteenth century land-clearing resulted in reduced rainfall over the region.[97] By 1850–1890, these human agricultural practices, concentrated in the eastern region of Australia, most likely amplified the drying and aridification that marked the end of the Little Ice Age.

In the north, evidence suggests fairly dry conditions, but coral cores from the Great Barrier Reef show similar rainfall as today but with less variability. A study that analyzed isotopes in Great Barrier Reef corals suggested that increased water vapor transport from southern tropical oceans to the poles contributed to the Little Ice Age.[98] Borehole reconstructions from Australia suggest that over the last 500 years, the 17th century was the coldest on the continent.[99] The borehole temperature reconstruction method further indicates that the warming of Australia over the past five centuries is only around half that of the warming experienced by the Northern Hemisphere, further proving that Australia did not reach the same depths of cooling as the continents to the north.

On the west coast of the Southern Alps of New Zealand, the Franz Josef glacier advanced rapidly during the Little Ice Age and reached its maximum extent in the early 18th century, in one of the few cases of a glacier thrusting into a rainforest.[100] Evidence suggests, corroborated by tree ring proxy data, that the glacier contributed to a -0.56 °C temperature anomaly over the course of the Little Ice Age in New Zealand.[101] Based on dating of a yellow-green lichen of the Rhizocarpon subgenus, the Mueller Glacier, on the eastern flank of the Southern Alps within Aoraki / Mount Cook National Park, is considered to have been at its maximum extent between 1725–1730.[102]

Pacific Islands

Sea-level data for the Pacific Islands suggest that sea level in the region fell, possibly in two stages, between 1270 and 1475. This was associated with a 1.5 °C fall in temperature (determined from oxygen-isotope analysis) and an observed increase in El Niño frequency.[103] Tropical Pacific coral records indicate the most frequent, intense El Niño-Southern Oscillation activity in the mid-seventeenth century.[104] Foraminiferald 18 O records indicate that the Indo-Pacific Warm Pool was warm and saline between 1000 and 1400, with temperatures approximating current conditions, but cooled from 1400 onwards, reaching its lowest temperatures in 1700, consistent with the transition from mid-Holocene warming to the Little Ice Age.[105] The nearby Southwestern Pacific, however, experienced warmer than average conditions over the course of the Little Ice Age, thought to be due to increased trade winds causing increased evaporation and higher salinity in the region, and that the dramatic temperature differences between the higher latitudes and the equator resulted in drier conditions in the subtropics.[106] Independent multiproxy analyses of Raraku Lake(sedimentology, mineralology, organic and inorganic geochemistry, etc) indicate that Easter Island was subject to two phases of arid climate leading to drought, with the first occurring between 500 and 1200, and second occurring during the Little Ice Age, from 1570 to 1720.[107] In between these two arid phases, the island enjoyed a humid period, extending from 1200 to 1570, coinciding with the maximum development of the Rapanui civilization.[108]

South America

Tree-ring data from Patagonia show cold episodes between 1270 and 1380 and from 1520 to 1670, contemporary with the events in the Northern Hemisphere.[109][110] Eight sediment cores taken from Puyehue Lake have been interpreted as showing a humid period from 1470 to 1700, which the authors describe as a regional marker of the onset of the Little Ice Age.[111] A 2009 paper details cooler and wetter conditions in southeastern South America between 1550 and 1800, citing evidence obtained via several proxies and models.[112] 18O records from three Andean ice cores show a cool period from 1600 to 1800.[113]

Although only anecdotal evidence, in 1675 the Spanish Antonio de Vea expedition entered San Rafael Lagoon through Río Témpanos (Spanish for "Ice Floe River") without mentioning any ice floe but stating that the San Rafael Glacier did not reach far into the lagoon. In 1766, another expedition noticed that the glacier reached the lagoon and calved into large icebergs. Hans Steffen visited the area in 1898, noticing that the glacier penetrated far into the lagoon. Such historical records indicate a general cooling in the area between 1675 and 1898: "The recognition of the LIA in northern Patagonia, through the use of documentary sources, provides important, independent evidence for the occurrence of this phenomenon in the region."[114] As of 2001, the border of the glacier had significantly retreated as compared to the borders of 1675.[114]

Possible causes

Scientists have tentatively identified seven possible causes of the Little Ice Age: orbital cycles; decreased solar activity; increased volcanic activity; altered ocean current flows;[115] fluctuations in the human population in different parts of the world causing reforestation, or deforestation; and the inherent variability of global climate.

Orbital cycles

Orbital forcing from cycles in the earth's orbit around the sun has, for the past 2,000 years, caused a long-term northern hemisphere cooling trend that continued through the Middle Ages and the Little Ice Age. The rate of Arctic cooling is roughly 0.02 °C per century.[116] This trend could be extrapolated to continue into the future, possibly leading to a full ice age, but the twentieth-century instrumental temperature record shows a sudden reversal of this trend, with a rise in global temperatures attributed to greenhouse gas emissions.[116]

Solar activity

Solar activity includes any sun disturbances like sunspots, solar flares, or prominences, and scientists can track these solar activities in the past by analyzing both the carbon 14 or Beryllium 10 isotopes in items like tree rings. These solar activities, while not the most common or noticeable causes for the little ice age, provide considerable evidence that they played a part in the formation of the little ice age and the increase in temperature after the period. During the time of the little ice age which ranged from 1450 to 1850, there were very low recorded levels of solar activity in the Spörer, Maunder, and Dalton minima.

The Spörer minimum was between 1450–1550, when the little ice age started. A study by Dmitri Mauquoy and others found that at the beginning of Spörer, the percentage of change of carbon-14 skyrocketed to about 10%.[citation needed] This percentage stayed pretty common along with the entire duration of the Spörer minimum, then around 1600 dropped rapidly before the Maunder (1645–1715) where it rose again to a little under 10% change. To put this into perspective, during standard periods the percentage change in carbon-14 idles between -5 to 5 percent so this is a considerable change. At the end of the little ice age which is also the Dalton minimum (1790–1830), the percentage change is normal around -1%. These changes in the Carbon-14 have a strong relationship with the temperature because during these three periods as an increase in the carbon-14 does correlate with cold temperatures during the little ice age.[117]

In a study by Judith Lean, where she talked about the sun and climate relationships and the cause and effect relationship that helped form the little ice age. In her research, she found that during a certain time period there a .13% solar irradiance increased the temperature of the earth by .3 degree Celsius. This was around 1650–1790 and this information can help you formulate another idea of what happened during the little ice age. When they calculated correlation coefficients of the global temperature response to solar forcing over three different periods it comes out to an average coefficient of .79. This shows a strong relationship between the two components and helps the point that the little ice age was considerably cold with very low solar activity. Lean and your team also formulated an equation where Change in T is equal to -168.802+Sx0.123426. This equals turns out to a .16 increase in temperature for every .1% increase in solar irradiance.[118]

To summarize, the entire length of the little ice age had a high percentage change in carbon-14 and low social irradiance. Both of these show a strong relationship to the cold temperatures during the time and while the changes of solar activity actually have on the temperature of the earth compared to things like greenhouse gases is very minimal. Solar activity is still important to the whole picture of climate change and does affect the earth even if it’s just less than one Celsius over a few hundred years.

Solar activity events recorded in radiocarbon
Solar activity events recorded in radiocarbon
The Maunder minimum in a 400-year history of sunspot numbers
The Maunder minimum in a 400-year history of sunspot numbers

Volcanic activity

In a 2012 paper, Miller et al. link the Little Ice Age to an "unusual 50-year-long episode with four large sulfur-rich explosive eruptions, each with global sulfate loading >60 Tg" and notes that "large changes in solar irradiance are not required."[7]

Throughout the Little Ice Age, the world experienced heightened volcanic activity.[119] When a volcano erupts, its ash reaches high into the atmosphere and can spread to cover the whole earth. The ash cloud blocks out some of the incoming solar radiation, leading to worldwide cooling that can last up to two years after an eruption. Also emitted by eruptions is sulfur, in the form of sulfur dioxide gas. When it reaches the stratosphere, it turns into sulfuric acid particles, which reflect the sun's rays, further reducing the amount of radiation reaching Earth's surface.

A recent study found that an especially massive tropical volcanic eruption in 1257, possibly of the now-extinct Mount Samalas near Mount Rinjani, both in Lombok, Indonesia, followed by three smaller eruptions in 1268, 1275, and 1284 did not allow the climate to recover. This may have caused the initial cooling, and the 1452–53 eruption of Kuwae in Vanuatu triggered a second pulse of cooling.[7] The cold summers can be maintained by sea-ice/ocean feedbacks long after volcanic aerosols are removed.

Other volcanoes that erupted during the era and may have contributed to the cooling include Billy Mitchell (c. 1580), Huaynaputina (1600), Mount Parker (1641), Long Island (Papua New Guinea) (ca. 1660), and Laki (1783).[24] The 1815 eruption of Tambora, also in Indonesia, blanketed the atmosphere with ash; the following year, 1816, came to be known as the Year Without a Summer,[120] when frost and snow were reported in June and July in both New England and Northern Europe.

Ocean circulation

Thermohaline circulation or Oceanic conveyor belt illustrated
Thermohaline circulation or Oceanic conveyor belt illustrated

Another possibility is that there was a slowing of thermohaline circulation.[57][115][121][122] The circulation could have been interrupted by the introduction of a large amount of fresh water into the North Atlantic, possibly caused by a period of warming before the Little Ice Age known as the Medieval Warm Period.[36][123][124] There is some concern that a shutdown of thermohaline circulation could happen again as a result of the present warming period.[125][126]

Decreased human populations

Some researchers have proposed that human influences on climate began earlier than is normally supposed (see Early anthropocene for more details) and that major population declines in Eurasia and the Americas reduced this impact, leading to a cooling trend.

The Black Death is estimated to have killed 30% to 60% of Europe's population.[127] In total, the plague may have reduced the world population from an estimated 475 million to 350–375 million in the 14th century.[128] It took 200 years for the world population to recover to its previous level.[129] William Ruddiman proposed that these large population reductions in Europe, East Asia, and the Middle East caused a decrease in agricultural activity. Ruddiman suggests reforestation took place, allowing more carbon dioxide uptake from the atmosphere, which may have been a factor in the cooling noted during the Little Ice Age. Ruddiman further hypothesized that a reduced population in the Americas after European contact in the 16th century could have had a similar effect.[130][131] Other researchers supported depopulation in the Americas as a factor, asserting that humans had cleared considerable amounts of forest to support agriculture in the Americas before the arrival of Europeans brought on a population collapse.[132][133] Richard Nevle, Robert Dull and colleagues further suggested that not only anthropogenic forest clearance played a role in reducing the amount of carbon sequestered in Neotropical forests, but that human-set fires played a central role in reducing biomass in Amazonian and Central American forests before the arrival of Europeans and the concomitant spread of diseases during the Columbian exchange.[134][135][136] Dull and Nevle calculated that reforestation in the tropical biomes of the Americas alone from 1500 to 1650 accounted for net carbon sequestration of 2-5 Pg.[135] Brierley conjectured that European arrival in the Americas caused mass deaths from epidemic disease, which caused much abandonment of farmland, which caused much return of forest, which sequestered greater levels of carbon dioxide.[12] A study of sediment cores and soil samples further suggests that carbon dioxide uptake via reforestation in the Americas could have contributed to the Little Ice Age.[137] The depopulation is linked to a drop in carbon dioxide levels observed at Law Dome, Antarctica.[132] A 2011 study by the Carnegie Institution's Department of Global Ecology asserts that the Mongol invasions and conquests, which lasted almost two centuries, contributed to global cooling by depopulating vast regions and allowing for the return of carbon absorbing forest over cultivated land.[138][139]

Population increases at mid- to high-latitudes

During the Little Ice Age period, it is suggested that increased deforestation had a significant enough effect on albedo (reflectiveness of the Earth) to decrease regional and global temperatures. Changes in albedo were caused by widespread deforestation at high latitudes. In turn this exposed more snow cover to and increased reflectiveness of the Earth's surface as land was cleared for agricultural use. This theory implies that over the course of the Little Ice Age land was cleared to an extent that warranted deforestation as a cause for climate change.[140]

It has been proposed that Land Use Intensification theory could explain this phenomenon. This theory was originally proposed by Ester Boserup and suggests that agriculture is only advanced as the population demands it.[141] Furthermore, there is evidence of rapid population and agricultural expansion that could warrant some of the changes observed in the climate during this period.

This theory is still under speculation for multiple reasons. Primarily, the difficulty of recreating climate simulations outside of a narrow set of land in these regions. This has led to an inability to rely on data to explain sweeping changes, or account for the wide variety of other sources of climate change globally. As an extension of the first reason climate models including this time period have shown increases and decreases in temperature globally.[142] That is, climate models have not shown deforestation as a singular cause for climate change, nor as a reliable cause for global temperature decrease.

Inherent variability of climate

Spontaneous fluctuations in global climate might explain past variability. It is very difficult to know what the true level of variability from internal causes might be given the existence of other forces, as noted above, whose magnitude may not be known. One approach to evaluating internal variability is to use long integrations of coupled ocean-atmosphere global climate models. They have the advantage that the external forcing is known to be zero, but the disadvantage is that they may not fully reflect reality. The variations may result from chaos-driven changes in the oceans, the atmosphere, or interactions between the two.[143] Two studies have concluded that the demonstrated inherent variability is not great enough to account for the Little Ice Age.[143][144] The severe winters of 1770 to 1772 in Europe, however, have been attributed to an anomaly in the North Atlantic oscillation.[145]

See also

References

  1. ^ Hawkins, Ed (30 January 2020). "2019 years". climate-lab-book.ac.uk. Archived from the original on 2 February 2020. ("The data show that the modern period is very different to what occurred in the past. The often quoted Medieval Warm Period and Little Ice Age are real phenomena, but small compared to the recent changes.")
  2. ^ Ladurie, Emmanuel Le Roy (1971). Times of Feast, Times of Famine: a History of Climate Since the Year 1000. Barbara Bray. Garden City, NY: Doubleday. ISBN 978-0-374-52122-6. OCLC 164590.
  3. ^ Matthes, François E. (1939). "Report of Committee on Glaciers, April 1939". Transactions, American Geophysical Union. 20 (4): 518. Bibcode:1939TrAGU..20..518M. doi:10.1029/TR020i004p00518. Matthes described glaciers in the Sierra Nevada of California that he believed could not have survived the hypsithermal; his usage of "Little Ice Age" has been superseded by "Neoglaciation".
  4. ^ a b Mann, Michael (2003). "Little Ice Age" (PDF). In Michael C MacCracken; John S Perry (eds.). Encyclopedia of Global Environmental Change, Volume 1, The Earth System: Physical and Chemical Dimensions of Global Environmental Change. John Wiley & Sons. Retrieved 17 November 2012.
  5. ^ Lamb, HH (1972). "The cold Little Ice Age climate of about 1550 to 1800". Climate: present, past and future. London: Methuen. p. 107. CiteSeerX 10.1.1.408.1689. ISBN 978-0-416-11530-7. (noted in Grove 2004:4).
  6. ^ a b "Earth observatory Glossary L-N". NASA Goddard Space Flight Center, Green Belt MD: NASA. Retrieved 17 July 2015. Cite journal requires |journal= (help)
  7. ^ a b c d e Miller, Gifford H.; Geirsdóttir, Áslaug; Zhong, Yafang; Larsen, Darren J.; Otto-Bliesner, Bette L.; Holland, Marika M.; Bailey, David A.; Refsnider, Kurt A.; Lehman, Scott J.; Southon, John R.; Anderson, Chance; Björnsson, Helgi; Thordarson, Thorvaldur (2012). "Abrupt onset of the Little Ice Age triggered by volcanism and sustained by sea-ice/ocean feedbacks". Geophysical Research Letters. 39 (2): n/a. Bibcode:2012GeoRL..39.2708M. CiteSeerX 10.1.1.639.9076. doi:10.1029/2011GL050168. Lay summaryScience Daily (30 January 2012).
  8. ^ Grove, J.M., Little Ice Ages: Ancient and Modern, Routledge, London (2 volumes) 2004.
  9. ^ Matthews, John A.; Briffa, Keith R. (2005). "The 'little ice age': Re‐evaluation of an evolving concept". Geografiska Annaler: Series A, Physical Geography. 87: 17–36. doi:10.1111/j.0435-3676.2005.00242.x. S2CID 4832081.
  10. ^ "1.4.3 Solar Variability and the Total Solar Irradiance – AR4 WGI Chapter 1: Historical Overview of Climate Change Science". Ipcc.ch. Retrieved 24 June 2013.
  11. ^ a b "Climate Change 2001: The Scientific Basis". UNEP/GRID-Arendal. Archived from the original on 29 May 2006. Retrieved 2 August 2007.
  12. ^ a b Koch, Alexander; Brierley, Chris; Maslin, Mark M.; Lewis, Simon L. (2019). "Earth system impacts of the European arrival and Great Dying in the Americas after 1492". Quaternary Science Reviews. 207: 13–36. Bibcode:2019QSRv..207...13K. doi:10.1016/j.quascirev.2018.12.004.
  13. ^ AR4 WG1 Section 6.6: The Last 2,000 Years, 2007.
  14. ^ Jones, Philip D. (2001). History and climate: memories of the future?. Springer. p. 154.[ISBN missing]
  15. ^ According to JM Lamb of Cambridge University the little ice age was already under way in Canada and Switzerland and in the wider North Atlantic region in the thirteenth and fourteenth centuries
  16. ^ "Worldwide glacier retreat". RealClimate. Retrieved 2 August 2007.
  17. ^ Oerlemans, J. (2005). "Extracting a Climate Signal from 169 Glacier Records". Science. 308 (5722): 675–77. Bibcode:2005Sci...308..675O. doi:10.1126/science.1107046. PMID 15746388. S2CID 26585604.
  18. ^ Jonathan Amos (30 September 2013). "Mystery 13th Century eruption traced to Lombok, Indonesia". BBC. The mystery event in 1257 was so large its chemical signature is recorded in the ice of both the Arctic and the Antarctic. European medieval texts talk of a sudden cooling of the climate, and of failed harvests.
  19. ^ Dagamar Degroot, 'Did the Spanish Empire Change Earth's Climate?' (2016)
  20. ^ Hendy, Erica J.; Gagan, Michael K.; Alibert, Chantal A.; McCulloch, Malcolm T.; Lough, Janice M.; Isdale, Peter J. (2002). "Abrupt Decrease in Tropical Pacific Sea Surface Salinity at End of Little Ice Age". Science. 295 (5559): 1511–14. Bibcode:2002Sci...295.1511H. doi:10.1126/science.1067693. PMID 11859191. S2CID 25698190.
  21. ^ Ogilvie, A.E.J.; Jónsson, T. (2001). "'Little Ice Age' Research: A Perspective from Iceland". Climatic Change. 48: 9–52. doi:10.1023/A:1005625729889. S2CID 189870320.
  22. ^ S.C. Porter. "Anout; Quaternary Science". INQUA. Archived from the original on 15 April 2010. Retrieved 6 May 2010.
  23. ^ Meacham, Jon (7 May 2020). "Pandemics of the Past". The New York Times. ISSN 0362-4331. Retrieved 8 May 2020.
  24. ^ a b c Jonathan Cowie (2007). Climate change: biological and human aspects. Cambridge University Press. p. 164. ISBN 978-0-521-69619-7.
  25. ^ Davies, Caroline (12 February 2021). "Part of River Thames freezes amid sub-zero temperatures". The Guardian. Retrieved 12 February 2021.
  26. ^ Stone, R. (2004). "Volcanology: Iceland's Doomsday Scenario?". Science. 306 (5700): 1278–81. doi:10.1126/science.306.5700.1278. PMID 15550636. S2CID 161557686.
  27. ^ "What Did They Eat? – Icelandic food from the Settlement through the Middle Ages". Archived from the original on 20 February 2012.
  28. ^ a b "SVS Science Story: Ice Age". NASA Scientific Visualization Studio. Retrieved 2 August 2007.
  29. ^ a b c Lamb, Hubert H. (1995). "The little ice age". Climate, history and the modern world. London: Routledge. pp. 211–41. ISBN 978-0-415-12734-9.
  30. ^ "Arquivo de eventos históricos – Página 4 – MeteoPT.com – Fórum de Meteorologia". MeteoPT.com. 17 July 2012. Retrieved 24 June 2013.
  31. ^ Jones, Evan T.; Hewlett, Rose; Mackay, Anson W. (5 May 2021). "Weird weather in Bristol during the Grindelwald Fluctuation (1560–1630)". Weather. 76 (4): 104–10. Bibcode:2021Wthr...76..104J. doi:10.1002/wea.3846 – via Wiley Online Library.
  32. ^ Cullen, Karen J. (2010). Famine in Scotland: The 'Ill Years' of The 1690s. Edinburgh University Press. p. 20. ISBN 978-0-7486-3887-1.
  33. ^ Ewanu, Elizabeth; Nugent, Janay (2008). Finding the Family in Medieval and Early Modern Scotland. Ashgate. p. 153. ISBN 978-0-7546-6049-1.
  34. ^ Whitehouse, David (17 December 2003). "Stradivarius' sound 'due to Sun'". BBC.
  35. ^ Burke, James (21 September 1978). "Thunder in the Skies". Connections. BBC.
  36. ^ a b Fagan 2001
  37. ^ a b c d e f g h i Behringer, Wolfgang (1999). "Climatic change and witch-hunting: the impact of the Little Ice Age on mentalities". Climatic Change. 43: 335–51. doi:10.1023/A:1005554519604. S2CID 189869470.
  38. ^ Dagomar Degroot, The Frigid Golden Age: Climate Change, the Little Ice Age, and the Dutch Republic, 1560–1720 (New York: Cambridge University Press, 2018) ISBN 978-1108419314[page needed]
  39. ^ a b c d e f Oster, Emily (2004). "Witchcraft, weather and economic growth in Renaissance Europe". The Journal of Economic Perspectives. 18 (1): 215–28. CiteSeerX 10.1.1.526.7789. doi:10.1257/089533004773563502. JSTOR 3216882. S2CID 22483025. SSRN 522403.
  40. ^ a b c d e f g h i Behringer, Wolfgang (2009). "Cultural Consequences of the Little Ice Age". A Cultural History of Climate. Wiley. pp. 121–67. ISBN 978-0-745-64529-2.
  41. ^ a b c d e f Parker, Geoffrey (2013). "The Little Ice Age". Global Crisis: War, Climate Change, & Catastrophe in the Seventeenth Century. Yale University Press. pp. 3–25. ISBN 978-0-300-20863-4.
  42. ^ a b Lehmann, Hartmut (1988). "The Persecution of Witches as Restoration of Order: The Case of Germany, 1590s–1650s". Central European History. 21 (2): 107–21. doi:10.1017/S000893890001270X.
  43. ^ a b Post, John D. (1984). "Climatic Variability and the European Mortality Wave of the Early 1740s". The Journal of Interdisciplinary History. 15 (1): 1–30. doi:10.2307/203592. JSTOR 203592. PMID 11617361.
  44. ^ "Part 12 of Annals of Loch Cé". Corpus of Electronic Texts. University College Cork.
  45. ^ Meigs, Samantha A. (1997). Reformations in Ireland: Tradition and Confessionalism, 1400–1690. Springer. ISBN 978-1349257102 – via Google Books.
  46. ^ a b c Macdougall, Douglas (2004). Frozen Earth: The Once and Future Story of Ice Ages. University of California Press. p. 225. ISBN 978-0-520-24824-3.
  47. ^ a b c Huddart, David; Stott, Tim (2010). Earth Environments: Past, Present and Future. Wiley. p. 863. ISBN 978-0-470-74960-9.
  48. ^ Dagomar Degroot (2018). The Frigid Golden Age: Climate Change, the Little Ice Age, and the Dutch Republic, 1560–1720. New York: Cambridge University Press. ISBN 978-1108419314.[page needed]
  49. ^ Burroughs, William (18 December 1980). "New Scientist". New Scientist Careers Guide : The Employer Contacts Book for Scientists. Reed Business Information: 768–. ISSN 0262-4079. 1980 article in the New Scientist
  50. ^ John E. Thornes; John Constable (1999). John Constable's skies: a fusion of art and science. Continuum International. p. 32. ISBN 978-1-902459-02-8.
  51. ^ "Kilsyth Curling". Retrieved 11 September 2010.
  52. ^ "The Story so Far!!!". Gourock Curling Club. 2009. Archived from the original on 25 April 2012. Retrieved 11 September 2010.
  53. ^ Zhang, David D.; Lee, Harry F.; Wang, Cong; Li, Baosheng; Pei, Qing; Zhang, Jane; An, Yulun (18 October 2011). "The causality analysis of climate change and large-scale human crisis". Proceedings of the National Academy of Sciences of the United States of America. 108 (42): 17296–301. doi:10.1073/pnas.1104268108. PMC 3198350. PMID 21969578.
  54. ^ National Geographic (2007). Essential Visual History of the World. National Geographic Society. pp. 190–91. ISBN 978-1-4262-0091-5.
  55. ^ Dutton, Edward; Woodley of Menie, Michael (2018). "Chapter 10: Does This Mean that Civilizations Always Rise and Fall?". At Our Wits' End: Why We're Becoming Less Intelligent and What It Means for the Future. Exeter, United Kingdom: Imprint Academic. ISBN 978-1845409852.
  56. ^ Kenyon W.A.; Turnbull J.R. (1971). The Battle for James Bay. Toronto: Macmillan Company of Canada Limited.
  57. ^ a b Broecker, Wallace S. (2000). "Was a change in thermohaline circulation responsible for the Little Ice Age?". Proceedings of the National Academy of Sciences. 97 (4): 1339–42. Bibcode:2000PNAS...97.1339B. doi:10.1073/pnas.97.4.1339. JSTOR 121471. PMC 34299. PMID 10677462.
  58. ^ "Ice Ages". National Park Service. Archived from the original on 12 April 2005.
  59. ^ Cronin, T. M.; Dwyer, G. S.; Kamiya, T.; Schwede, S.; Willard, D. A. (2003). "Medieval Warm Period, Little Ice Age and 20th century temperature variability from Chesapeake Bay" (PDF). Global and Planetary Change. 36 (1): 17. Bibcode:2003GPC....36...17C. doi:10.1016/S0921-8181(02)00161-3. hdl:10161/6578.
  60. ^ Wolfe, Brendan (7 December 2020). "Little Ice Age and Colonial Virginia". The Encyclopedia Virginia. Retrieved 26 May 2021.
  61. ^ "Climate and Mastery of the Wilderness in Seventeenth-Century New England". Colonial Society of Massachusetts. Retrieved 26 May 2021.
  62. ^ Headrick, Daniel (2015). "Global Warming, the Ruddiman Thesis, and the Little Ice Age". Journal of World History. 26 (1): 157–60. doi:10.1353/jwh.2016.0000. JSTOR 43818831. S2CID 147246368.
  63. ^ White, Sam (2015). "Unpuzzling American Climate: New World Experience and the Foundations of a New Science". Isis. 106 (3): 544–66. doi:10.1086/683166. JSTOR 10.1086/683166. PMID 26685517. S2CID 37331690.
  64. ^ Hodell, David A.; Brenner, Mark; Curtis, Jason H.; Medina-González, Roger; Ildefonso-Chan Can, Enrique; Albornaz-Pat, Alma; Guilderson, Thomas P. (2005). "Climate change on the Yucatan Peninsula during the Little Ice Age". Quaternary Research. 63 (2): 109. Bibcode:2005QuRes..63..109H. doi:10.1016/j.yqres.2004.11.004. S2CID 129924750.
  65. ^ del Socorro Lozano-García, Ma.; Caballero, Margarita; Ortega, Beatriz; Rodríguez, Alejandro; Sosa, Susana (2007). "Tracing the effects of the Little Ice Age in the tropical lowlands of eastern Mesoamerica". Proceedings of the National Academy of Sciences. 104 (41): 16200–03. Bibcode:2007PNAS..10416200L. doi:10.1073/pnas.0707896104. PMC 2000453. PMID 17913875.
  66. ^ Bond et al., 1997[full citation needed]
  67. ^ "Abrupt Climate Changes Revisited: How Serious and How Likely?". USGCRP Seminar. US Global Change Research Program. 23 February 1998.
  68. ^ a b c Reiter, Paul (2000). "From Shakespeare to Defoe: Malaria in England in the Little Ice Age". Emerging Infectious Diseases. 6 (1): 1–11. doi:10.3201/eid0601.000101. PMC 2627969. PMID 10653562.
  69. ^ Liu, Kam-biu; Shen, Caiming; Louie, Kin-Sheun (2001). "A 1,000-Year History of Typhoon Landfalls in Guangdong, Southern China, Reconstructed from Chinese Historical Documentary Records". Annals of the Association of American Geographers. 91 (3): 453–64. doi:10.1111/0004-5608.00253. S2CID 53066209.
  70. ^ Fan, Ka-wai (2010). "Climatic change and dynastic cycles in Chinese history: A review essay". Climatic Change. 101 (3–4): 565–73. Bibcode:2010ClCh..101..565F. doi:10.1007/s10584-009-9702-3. S2CID 153997845.
  71. ^ Cai, Wenjuan; Yn, Shuyan (March 2009). "The freeze disasters in the Little Ice Age of Ming and Qing Dynasties in the Guanzhong Region". Journal of Arid Land Resources and Environment. College of Tourism and Environmental Sciences, Shaanxi Normal University. 23 (3): 119.
  72. ^ Zhang, Xian; Shao, Xiaohua; Wang, Tao (3 May 2013). "Regional Climate Characteristics in China during the Little Ice Age". Journal of Nanjing University of Information Science and Technology: Natural Science Edition. 4 (1): 317–25.
  73. ^ KeZhen, Zhu (January 1972). "中国近五千年来气候变迁的初步研究". Acta Archaeologica Sinica. 1 (1): 25.
  74. ^ Xiao, Jie; Zheng, Guozhang; Guo, Zhengsheng; Yan, Lisha (June 2018). "Climate change and social response during the heyday of the little ice age in the Ming and Qing dynasty". Journal of Arid Land Resources and Environment, College of Geography Science, Shanxi Normal University. 32 (6): 80. doi:10.13448/j.cnki.jalre.2018.176.
  75. ^ Yi, Shanming (May 2015). "明朝灭亡与"小冰期"". Journal of Social Science of the North China University of Water Conservancy and Electric Power. 1 (5): 3. Retrieved 5 May 2021.
  76. ^ Xiao, Lingbo, Xiuqi Fang, Jingyun Zheng, and Wanyi Zhao. “Famine, Migration and War: Comparison of Climate Change Impacts and Social Responses in North China between the Late Ming and Late Qing Dynasties.” Holocene 25, no. 6 (June 2015): 900–10. doi:10.1177/0959683615572851.
  77. ^ Rowan, Ann (1 February 2017). "The 'Little Ice Age' in the Himalaya: A review of glacier advance driven by Northern Hemisphere temperature change". The Holocene. 27 (2): 292–308. Bibcode:2017Holoc..27..292R. doi:10.1177/0959683616658530. S2CID 55253587. Retrieved 6 May 2021.
  78. ^ "From Zardaris to Makranis: How the Baloch came to Sindh". The Express Tribune. 28 March 2014.
  79. ^ Johnson, Thomas C.; Barry, Sylvia L.; Chan, Yvonne; Wilkinson, Paul (2001). <0083:drocvs>2.0.co;2 "Decadal record of climate variability spanning the past 700 yr in the Southern Tropics of East Africa". Geology. 29 (1): 83. Bibcode:2001Geo....29...83J. doi:10.1130/0091-7613(2001)029<0083:drocvs>2.0.co;2. ISSN 0091-7613.
  80. ^ Klein, Richard G. (December 2000). "The Earlier Stone Age of Southern Africa". The South African Archaeological Bulletin. 55 (172): 107–22. doi:10.2307/3888960. ISSN 0038-1969. JSTOR 3888960.
  81. ^ Johnson, Thomas C.; Barry, Sylvia L.; Chan, Yvonne; Wilkinson, Paul (2001). "Decadal record of climate variability spanning the past 700 yr in the Southern Tropics of East Africa". Geology. 29 (1): 83. Bibcode:2001Geo....29...83J. doi:10.1130/0091-7613(2001)029<0083:DROCVS>2.0.CO;2. S2CID 20364249.
  82. ^ Holmgren, K., Tyson, P.D., Moberg, A., Svanered, O. (2001). "A preliminary 3000-year regional temperature reconstruction for South Africa". South African Journal of Science. 97: 49–51. hdl:10520/EJC97278.CS1 maint: multiple names: authors list (link)
  83. ^ Sundqvist, H. S.; Holmgren, K.; Fohlmeister, J.; Zhang, Q.; Matthews, M. Bar; Spötl, C.; Körnich, H. (December 2013). "Evidence of a large cooling between 1690 and 1740 AD in southern Africa". Scientific Reports. 3 (1): 1767. Bibcode:2013NatSR...3E1767S. doi:10.1038/srep01767. ISSN 2045-2322. PMC 3642658.
  84. ^ MacKay, Anson W.; Bamford, Marion K.; Grab, Stefan W.; Fitchett, Jennifer M. (2016). "A multi-disciplinary review of late Quaternary palaeoclimates and environments for Lesotho". South African Journal of Science. 112. doi:10.17159/sajs.2016/20160045.
  85. ^ Huffman, Thomas N. (January 1996). "Archaeological evidence for climatic change during the last 2000 years in southern Africa". Quaternary International. 33: 55–60. Bibcode:1996QuInt..33...55H. doi:10.1016/1040-6182(95)00095-x. ISSN 1040-6182.
  86. ^ Nicholson, Sharon E.; Yin, Xungang (2001). "Rainfall Conditions in Equatorial East Africa during the Nineteenth Century as Inferred from the Record of Lake Victoria". Climatic Change. 48 (2/3): 387–98. doi:10.1023/a:1010736008362. ISSN 0165-0009. S2CID 130327434.
  87. ^ Kreutz, K. J. (1997). "Bipolar Changes in Atmospheric Circulation During the Little Ice Age". Science. 277 (5330): 1294–96. doi:10.1126/science.277.5330.1294. S2CID 129868172.
  88. ^ Khim, Boo-Keun; Yoon, Ho Il; Kang, Cheon Yun; Bahk, Jang Jun (2002). "Unstable Climate Oscillations during the Late Holocene in the Eastern Bransfield Basin, Antarctic Peninsula". Quaternary Research. 58 (3): 234. Bibcode:2002QuRes..58..234K. doi:10.1006/qres.2002.2371. S2CID 129384061.
  89. ^ "Siple Dome Glaciochemistry". Retrieved 4 October 2017.
  90. ^ Sarah B. Das; Richard B. Alley. "Clues to changing WAIS Holocene summer temperatures from variations in melt-layer frequency in the Siple Dome ice core". Archived from the original on 7 October 2006.
  91. ^ D.M. Etheridge; L.P. Steele; R.L. Langenfelds; R.J. Francey; J.-M. Barnola; V.I. Morgan. "Historical CO
    2
     Records from the Law Dome DE08, DE08-2, and DSS Ice Cores"
    . Carbon Dioxide Information Analysis Center. Oak Ridge National Laboratory, U.S. Department of Energy, Oak Ridge, Tenn.
  92. ^ Bárcena, M. Angeles; Gersonde, Rainer; Ledesma, Santiago; Fabrés, Joan; Calafat, Antonio M.; Canals, Miquel; Sierro, F. Javier; Flores, Jose A. (1998). "Record of Holocene glacial oscillations in Bransfield Basin as revealed by siliceous microfossil assemblages". Antarctic Science. 10 (3): 269. Bibcode:1998AntSc..10..269B. doi:10.1017/S0954102098000364.
  93. ^ Rhodes, R. H.; Bertler, N. A. N.; Baker, J. A.; Steen-Larsen, H. C.; Sneed, S. B.; Morgenstern, U.; Johnsen, S. J. (2012). "Little Ice Age climate and oceanic conditions of the Ross Sea, Antarctica from a coastal ice core record". Climate of the Past. 8 (4): 1223. Bibcode:2012CliPa...8.1223R. doi:10.5194/cp-8-1223-2012.
  94. ^ a b c Tibby, J; Tyler, JJ; Barr, C. “Post little ice age drying of eastern Australia conflates understanding of early settlement impacts.” Quaternary Science Reviews. Vol. 202 (15 December 2018): 45–54.
  95. ^ Mercer, D.; Marden, P. “Ecologically sustainable development in a 'quarry' economy: one step forward, two steps back.” Geogr. Res., 44 (2006): 183–202. doi:10.1111/j.1745-5871.2006.00376.x
  96. ^ Gordon, L; Dunlop, M; Foran, B. “Land cover change and water vapour flows: learning from Australia.” Phil. Trans. Biol. Sci., 385 (2003): 1973–84.
  97. ^ Nair, U.S; Wu, Y; Kala, J; Lyons, T.J; Peilke, R.A; Hacker, J.M. “The role of land use change on the development and evolution of the west coast trough, convective clouds, and precipitation in southwest Australia.” Journal of Geophysical Research: Atmospheres, 116 (2011): p. D7.
  98. ^ Hendy, Erica J.; Gagan, Michael K.; Alibert, Chantal A.; McCulloch, Malcolm T.; Lough, Janice M.; Isdale, Peter J. (2002). "Abrupt Decrease in Tropical Pacific Sea Surface Salinity at End of Little Ice Age". Science. 295 (5559): 1511–14. Bibcode:2002Sci...295.1511H. doi:10.1126/science.1067693. PMID 11859191. S2CID 25698190.
  99. ^ Pollack, Henry N.; Huang, Shaopeng; Smerdon, Jason E. (2006). "Five centuries of climate change in Australia: The view from underground". Journal of Quaternary Science. 21 (7): 701. Bibcode:2006JQS....21..701P. doi:10.1002/jqs.1060.
  100. ^ Fagan, Brian M. (2001). The Little Ice Age: How Climate Made History, 1300–1850. Basic Books. ISBN 978-0-465-02272-4.
  101. ^ Lorrey, Andrew; Fauchereau, Nicholas; Stanton, Craig; Pearce, Petra. “The Little Ice Age climate of New Zealand reconstructed from South Alps cirque glaciers: A synoptic type approach.” Climate Dynamics (June 2013): 11–12. doi:10.1007/s00382-013-1876-8.
  102. ^ Winkler, Stefan (2000). "The 'Little Ice Age' maximum in the Southern Alps, New Zealand: Preliminary results at Mueller Glacier". The Holocene. 10 (5): 643–47. Bibcode:2000Holoc..10..643W. doi:10.1191/095968300666087656. S2CID 131695554.
  103. ^ Nunn, Patrick D. (2000). "Environmental catastrophe in the Pacific Islands around A.D. 1300". Geoarchaeology. 15 (7): 715–40. doi:10.1002/1520-6548(200010)15:7<715::AID-GEA4>3.0.CO;2-L.
  104. ^ Kim M. Cobb; Chris Charles; Hai Cheng; R. Lawrence Edwards. "The Medieval Cool Period and the Little Warm Age in the Central Tropical Pacific? Fossil Coral Climate Records of the Last Millennium". Archived from the original on 20 November 2003.
  105. ^ Field, Julie, S; Lape, Peter, V (March 2010). "Paleoclimates and the emergence of fortifications in the tropical Pacific islands". Journal of Anthropological Archaeology. Elsevier Inc. 29 (1): 113–24. doi:10.1016/j.jaa.2009.11.001 – via Elsevier Science Direct.
  106. ^ Hendy, E. J. (22 February 2002). "Abrupt Decrease in Tropical Pacific Sea Surface Salinity at End of Little Ice Age". Science. 295 (5559): 1511–14. Bibcode:2002Sci...295.1511H. doi:10.1126/science.1067693. ISSN 0036-8075. PMID 11859191. S2CID 25698190.
  107. ^ Rull, Valenti (5 January 2020). "Drought, freshwater availability and cultural resilience on Easter Island (SE Pacific) during the Little Ice Age". The Holocene. Sage Publications. 30 (5): 774–80. Bibcode:2020Holoc..30..774R. doi:10.1177/0959683619895587. S2CID 214564573 – via GeoRef In Process.
  108. ^ Fischer, Steven Roger (2005). Island at the End of the World: The Turbulent History of Easter Island. London: Reaktion Books. ISBN 1861892829.
  109. ^ Villalba, Ricardo (1990). "Climatic fluctuations in northern Patagonia during the last 1000 years as inferred from tree-ring records". Quaternary Research. 34 (3): 346–60. Bibcode:1990QuRes..34..346V. doi:10.1016/0033-5894(90)90046-N.
  110. ^ Villalba, Ricardo (1994). "Tree-ring and glacial evidence for the medieval warm epoch and the little ice age in southern South America". Climatic Change. 26 (2–3): 183–97. Bibcode:1994ClCh...26..183V. doi:10.1007/BF01092413. S2CID 189877440.
  111. ^ Bertrand, Sébastien; Boës, Xavier; Castiaux, Julie; Charlet, François; Urrutia, Roberto; Espinoza, Cristian; Lepoint, Gilles; Charlier, Bernard; Fagel, Nathalie (2005). "Temporal evolution of sediment supply in Lago Puyehue (Southern Chile) during the last 600 yr and its climatic significance". Quaternary Research. 64 (2): 163. Bibcode:2005QuRes..64..163B. doi:10.1016/j.yqres.2005.06.005. S2CID 20090174.
  112. ^ Meyer, Inka; Wagner, Sebastian (2009). "The Little Ice Age in Southern South America: Proxy and Model Based Evidence". Past Climate Variability in South America and Surrounding Regions. Developments in Paleoenvironmental Research. 14. pp. 395–412. doi:10.1007/978-90-481-2672-9_16. ISBN 978-90-481-2671-2.
  113. ^ Thompson, L. G.; Mosley-Thompson, E.; Davis, M. E.; Lin, P. N.; Henderson, K.; Mashiotta, T. A. (2003). "Tropical Glacier and Ice Core Evidence of Climate Change on Annual to Millennial Time Scales". Climate Variability and Change in High Elevation Regions: Past, Present & Future. Advances in Global Change Research. 15. p. 137. doi:10.1007/978-94-015-1252-7_8. ISBN 978-90-481-6322-9.
  114. ^ a b Araneda, Alberto; Torrejón, Fernando; Aguayo, Mauricio; Torres, Laura; Cruces, Fabiola; Cisternas, Marco; Urrutia, Roberto (2007). "Historical records of San Rafael glacier advances (North Patagonian Icefield): Another clue to 'Little Ice Age' timing in southern Chile?". The Holocene. 17 (7): 987. Bibcode:2007Holoc..17..987A. doi:10.1177/0959683607082414. hdl:10533/178477. S2CID 128826804.
  115. ^ a b Wanamaker, Alan D.; Butler, Paul G.; Scourse, James D.; Heinemeier, Jan; Eiríksson, Jón; Knudsen, Karen Luise; Richardson, Christopher A. (2012). "Surface changes in the North Atlantic meridional overturning circulation during the last millennium". Nature Communications. 3: 899. Bibcode:2012NatCo...3..899W. doi:10.1038/ncomms1901. PMC 3621426. PMID 22692542.
  116. ^ a b Kaufman, D. S.; Schneider, D. P.; McKay, N. P.; Ammann, C. M.; Bradley, R. S.; Briffa, K. R.; Miller, G. H.; Otto-Bliesner, B. L.; Overpeck, J. T.; Vinther, B. M.; Abbott, M.; Axford, M.; Bird, Y.; Birks, B.; Bjune, H. J. B.; Briner, A. E.; Cook, J.; Chipman, T.; Francus, M.; Gajewski, P.; Geirsdottir, K.; Hu, A.; Kutchko, F. S.; Lamoureux, B.; Loso, S.; MacDonald, M.; Peros, G.; Porinchu, M.; Schiff, D.; Seppa, C.; Seppa, H.; Arctic Lakes 2k Project Members (2009). "Recent Warming Reverses Long-Term Arctic Cooling" (PDF). Science. 325 (5945): 1236–39. Bibcode:2009Sci...325.1236K. CiteSeerX 10.1.1.397.8778. doi:10.1126/science.1173983. PMID 19729653. S2CID 23844037.
    "Arctic Warming Overtakes 2,000 Years of Natural Cooling". UCAR. 3 September 2009. Archived from the original on 27 April 2011. Retrieved 19 May 2011.
    Bello, David (4 September 2009). "Global Warming Reverses Long-Term Arctic Cooling". Scientific American. Retrieved 19 May 2011.
  117. ^ Mauquoy, Dmitri; van Geel, Bas; Blaauw, Maarten; van der Plicht, Johannes (1 January 2002). "Evidence from northwest European bogs shows 'Little Ice Age' climatic changes driven by variations in solar activity". The Holocene. 12 (1): 1–6. Bibcode:2002Holoc..12....1M. doi:10.1191/0959683602hl514rr. ISSN 0959-6836. S2CID 131513256.
  118. ^ Lean, Judith; Rind, David (1 January 1999). "Evaluating sun–climate relationships since the Little Ice Age". Journal of Atmospheric and Solar-Terrestrial Physics. 61 (1–2): 25–36. Bibcode:1999JASTP..61...25L. doi:10.1016/S1364-6826(98)00113-8. ISSN 1364-6826.
  119. ^ Robock, Alan (1979). "The "Little Ice Age": Northern Hemisphere Average Observations and Model Calculations". Science. 206 (4425): 1402–04. Bibcode:1979Sci...206.1402R. doi:10.1126/science.206.4425.1402. PMID 17739301. S2CID 43754672.
  120. ^ "Is the Meghalayan Event a Tipping Point in Geology?". The Wire.
  121. ^ "A Chilling Possibility – NASA Science". Science.nasa.gov. Archived from the original on 17 March 2010. Retrieved 24 June 2013.
  122. ^ Hopkin, Michael (29 November 2006). "Gulf Stream weakened in 'Little Ice Age'". BioEd Online. Retrieved 1 February 2019.
  123. ^ Villanueva, John Carl (19 October 2009). "Little Ice Age". Universe Today. Retrieved 22 September 2010.
  124. ^ Pittenger, Richard F.; Gagosian, Robert B. (October 2003). "Global Warming Could Have a Chilling Effect on the Military" (PDF). Defense Horizons. 33. Retrieved 22 September 2010.
  125. ^ Leake, Jonathan (8 May 2005). "Britain faces big chill as ocean current slows". The Times. London. Archived from the original on 8 February 2007. Retrieved 11 May 2010.
  126. ^ "Little Ice Age, on season 15, episode  5". Scientific American Frontiers. Chedd-Angier Production Company. 2005. PBS. Archived from the original on 2006.
  127. ^ Austin Alchon, Suzanne (2003). A pest in the land: new world epidemics in a global perspective. University of New Mexico Press. p. 21. ISBN 978-0-8263-2871-7.
  128. ^ "Historical Estimates of World Population". Census.gov. Retrieved 28 April 2019.
  129. ^ Jay, Peter (17 July 2000). "A Distant Mirror". TIME Europe. 156 (3). Archived from the original on 25 July 2008. Retrieved 25 January 2018.
  130. ^ Ravilious, Kate (27 February 2006). "Europe's chill linked to disease". BBC.
  131. ^ Ruddiman, William F. (2003). "The Anthropogenic Greenhouse Era Began Thousands of Years Ago". Climatic Change. 61 (3): 261–93. CiteSeerX 10.1.1.651.2119. doi:10.1023/B:CLIM.0000004577.17928.fa. S2CID 2501894.
  132. ^ a b Faust, Franz X.; Gnecco, Cristóbal; Mannstein, Hermann; Stamm, Jörg (2006). "Evidence for the Postconquest Demographic Collapse of the Americas in Historical CO2 Levels" (PDF). Earth Interactions. 10 (11): 1. Bibcode:2006EaInt..10k...1F. doi:10.1175/EI157.1.
  133. ^ R.J. Nevle et al., "Ecological-hydrological effects of reduced biomass burning in the neotropics after A.D. 1500," Geological Society of America Meeting, Minneapolis MN, 11 October 2011. abstract. Popular summary: "Columbus' arrival linked to carbon dioxide drop: Depopulation of Americas may have cooled climate," Science News, 5 November 2011. (access date 2 January 2012)
  134. ^ Nevle, Richard J.; Bird, Dennis K. (7 July 2008). "Effects of syn-pandemic fire reduction and reforestation in the tropical Americas on atmospheric CO2 during European conquest". Palaeogeography, Palaeoclimatology, Palaeoecology. 264 (1): 25–38. Bibcode:2008PPP...264...25N. doi:10.1016/j.palaeo.2008.03.008. ISSN 0031-0182.
  135. ^ a b Dull, Robert A.; Nevle, Richard J.; Woods, William I.; Bird, Dennis K.; Avnery, Shiri; Denevan, William M. (31 August 2010). "The Columbian Encounter and the Little Ice Age: Abrupt Land Use Change, Fire, and Greenhouse Forcing". Annals of the Association of American Geographers. 100 (4): 755–71. doi:10.1080/00045608.2010.502432. ISSN 0004-5608. S2CID 129862702.
  136. ^ Nevle, R.J.; Bird, D.K.; Ruddiman, W.F.; Dull, R.A. (1 August 2011). "Neotropical human–landscape interactions, fire, and atmospheric CO2 during European conquest". The Holocene. 21 (5): 853–64. Bibcode:2011Holoc..21..853N. doi:10.1177/0959683611404578. ISSN 0959-6836. S2CID 128896863.
  137. ^ Bergeron, Louis (17 December 2008). "Reforestation helped trigger Little Ice Age, researchers say". Stanford News Service.
  138. ^ "War, Plague No Match For Deforestation In Driving CO2 Buildup". Carnegie Institution for Science. 20 January 2011. Retrieved 8 December 2019.
  139. ^ Julia Pongratz; Ken Caldeira; Christian H. Reick; Martin Claussen (20 January 2011). "Coupled climate–carbon simulations indicate minor global effects of wars and epidemics on atmospheric CO2 between ad 800 and 1850". The Holocene. 21 (5): 843–851. doi:10.1177/0959683610386981. ISSN 0959-6836. Wikidata Q106515792.
  140. ^ Ellis, Erle C.; Kaplan, Jed O.; Fuller, Dorian Q.; Vavrus, Steve; Klein Goldewijk, Kees; Verburg, Peter H. (2013). "Used planet: A global history". Proceedings of the National Academy of Sciences. 110 (20): 7978–85. Bibcode:2013PNAS..110.7978E. doi:10.1073/pnas.1217241110. PMC 3657770. PMID 23630271.
  141. ^ Turner, B. L.; Fischer-Kowalski, Marina (2010). "Ester Boserup: An interdisciplinary visionary relevant for sustainability". Proceedings of the National Academy of Sciences of the United States of America. 107 (51): 21963–65. Bibcode:2010PNAS..10721963T. doi:10.1073/pnas.1013972108. PMC 3009765. PMID 21135227.
  142. ^ Pitman, A.J.; Noblet-Ducoudre, N.; Cruz, F.T.; Davin, E.L.; Bonan, G.B.; Brovkn, V.; Claussen, M.; Delire, C.; Ganzeveld, L.; Gayler, V.; Can den Hurk, B.J.J.M.; Lawrence, P.J.; van der Molen, M.K.; Muller, C.; Reick, C.H.; Seneviratne, S.I.; Strengers, B.J.; Voldoire, A. (2009). "Uncertainties in climate responses to past land cover change: First results from the LUCID intercomparison study". Geophysical Research Letters. 36 (L14814): L14814. Bibcode:2009GeoRL..3614814P. doi:10.1029/2009GL039076.
  143. ^ a b Free, Melissa; Robock, Alan (1999). "Global warming in the context of the Little Ice Age". Journal of Geophysical Research. 104 (D16): 19, 057. Bibcode:1999JGR...10419057F. doi:10.1029/1999JD900233.
  144. ^ Hunt, B. G. (2006). "The Medieval Warm Period, the Little Ice Age and simulated climatic variability". Climate Dynamics. 27 (7–8): 677–94. Bibcode:2006ClDy...27..677H. doi:10.1007/s00382-006-0153-5. S2CID 128890550.
  145. ^ Collet, Dominik (2020). "Hungern und handeln". Damals (in German). No. 6. pp. 72–76.

Further reading

External links

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