Albion
11-11-2011, 09:48 PM
Western Europe experienced a general cooling of the climate between the years 1150 and 1460 and a very cold climate between 1560 and 1850 that brought dire consequences to its peoples. The colder weather impacted agriculture, health, economics, social strife, emigration, and even art and literature. Increased glaciation and storms also had a devastating affect on those that lived near glaciers and the sea.
Impact on Agriculture
http://upload.wikimedia.org/wikipedia/commons/9/99/Vineyard_at_Wyken_Hall_-_geograph.org.uk_-_216836.jpg
English Vineyard
Lamb (1966) points out that in the warmest times of the last 1000 years, southern England had the climate that northern France has now. For example, the difference between the northen-most vineyard in England in the past and present-day vineyard locations in France is about 350 miles. In other terms that means the growing season changed by 15 to 20 percent between the warmest and coldest times of the millenium. That is enough to affect almost any type of food production, especially crops highly adapted to use the full-season warm climatic periods. During the coldest times of the LIA, England's growing season was shortened by one to two months compared to present day values. The availability of varieties of seed today that can withstand extreme cold or warmth, wetness or dryness, was not available in the past. Therefore, climate changes had a much greater impact on agricultural output in the past.
One of the worst famines in the seventeenth century occurred in France due to the failed harvest of 1693. Millions of people in France and surrounding countries were killed.
The effect of the LIA on Swiss farms was also severe. Due to the cooler climate, snow covered the ground deep into spring. A parasite, known as Fusarium nivale, which thrives under snow cover, devastated crops. Additionally, due to the increased number of days of snow cover, the stocks of hay for the animals ran out so livestock were fed on straw and pine branches. Many cows had to be slaughtered.
In Norway, many farms located at higher latitudes were abandoned for better land in the valleys. By 1387, production and tax yields were between 12 percent and 70 percent of what they had been around 1300. In the 1460's it was being recognized that this change was permanent. As late as the year 1665, the total Norwegian grain harvest is reported to have been only 67 - 70 percent of what it had been about the year 1300 (Lamb, 1995.)
Impact on Wine Production
People keep records of their most important crops, grapes for wine-making being no exception. Ladurie (1971) notes that there were many "bad years" for wine during the LIA in France and surrounding countries due to very late harvests and very wet summers. The cultivation of grapes was extensive throughout the southern portion of England from about 1100-1300. This area is about 300 miles farther north than the areas in France and Germany that grow grapes today (although hardy German strains are now grown in England once more (http://en.wikipedia.org/wiki/English_wine)).
Grapes were also grown in northern France and Germany at that time, areas which even today do not sustain commercial vineyards. At the time of the compilation of the Domesday Survey in the late eleventh century, vineyards were recorded in 46 places in southern England, from East Anglia through to modern-day Somerset. By the time King Henry VIIIth ascended the throne there were 139 sizeable vineyards in England and Wales - 11 of them owned by the Crown, 67 by noble families and 52 by the church (English-wine.com). In fact, Lamb (1995) suggests that during that period the amount of wine produced in England was substantial enough to provide significant economic competition with the producers in France. With the coming cooler climate in the 1400's, temperatures became too cold for grape production and the vineyards in southern England gradually declined.
German wine production also declined during the cooling experienced after the MWP and during the LIA. Between 1400 and 1700 German wine production was never above 53% of the production before 1300 and at times was as low as 20% of that production (Lamb, 1995.)
Impact on Forests During the Little Ice Age
http://planetearth.nerc.ac.uk/images/uploaded/medium/beech-forest-m.jpg
A study of the tree populations in forests of Southern Ontario by Campbell and McAndrews (1993) shows how the tree population in Europe might have been changed by the LIA. Their analysis of pollen demonstrated that after the year 1400, beech trees, the formerly dominant warmth-loving species, were replaced first by oak and subsequently by pine. Further, the forest under study appears to have remained in disequilbrium with the prevailing climate of today. That suggests that tree population distribution takes hundreds of years to recover from major climate changes.
Impact on Health
http://cbertel.files.wordpress.com/2011/02/france-ergot-st-anthonys-fire-cartoon-2.jpg
The cooler climate during the LIA had a huge impact on the health of Europeans. As mentioned earlier, dearth and famine killed millions and poor nutrition decreased the stature of the Vikings in Greenland and Iceland.
Cool, wet summers led to outbreaks of an illness called St. Anthony's Fire (Ergotism). Whole villages would suffer convulsions, hallucinations, gangrenous rotting of the extremities, and even death. Grain, if stored in cool, damp conditions, may develop a fungus known as ergot blight and also may ferment just enough to produce a drug similar to LSD. (In fact, some historians claim that the Salem, Massachusetts witch hysteria was the result of ergot blight.)
Malnutrition led to a weakened immunity to a variety of illnesses. In England, malnutrition aggravated an influenza epidemic of 1557-8 in which whole families died. In fact, during most of the 1550's deaths outnumbered births (Lamb, 1995.) The Black Death (Bubonic Plague) was hastened by malnutrition all over Europe.
One might not expect a typically tropical disease such as malaria to be found during the LIA, but Reiter (2000) has shown that it was an important cause of illness and death in several parts of England. The English word for malaria was ague, a term that remained in common usage until the nineteenth century. Geoffrey Chaucer (1342-1400) wrote in the Nun's Priest Tale:
You are so very choleric of complexion.
Beware the mounting sun and all dejection,
Nor get yourself with sudden humours hot;
For if you do, I dare well lay a groat
That you shall have the tertian fever's pain,
Or some ague that may well be your bane.
In sixteenth century England, many marshlands were notorious for their ague-stricken populations. William Shakespeare (1564-1616) mentioned ague in eight of his plays. Oliver Cromwell (1599-1658) died of ague in September 1658, which was one of the coldest years of the LIA.
Five indigenous species of mosquito are capable of transmitting malaria in England where they prefer the brackish water along river estuaries. The anaerobic bacterial flora of saline mud produces a strong sulfur odor that was widely believed to be the cause of agues in salt marsh areas (i.e. Shakespeare's "unwholesome fens.") The term malaria comes from the Italian term "mala aria" meaning "bad air."
Impact on Economics
In addition to increasing grain prices and lower wine production, there were many examples of economic impact by the dramatic cooling of the climate. Due to famine, storms, and growth of glaciers ,many farmsteads were destroyed, which resulted in less tax revenues collected due to decreased value of the properties (Lamb, 1995.)
Cod fishing greatly decreased, especially for the Scottish fisherman, as the cod moved farther south. The cod fishery at the Faeroe Islands began to fail around 1615 and failed altogether for thirty years between 1675 and 1704 (Lamb, 1995.) In the Hohe Tauern mountains of the Austrian Alps, advancing glaciers closed the gold mines of the Archbishop of Salzburg who was one of the wealthiest dukes in the empire. The succession of two or three bad summers where the miners could not rely on work in the mines caused them to find employment elsewhere, which resulted in an abrupt end to the mining operations (Bryson, 1977.)
http://upload.wikimedia.org/wikipedia/commons/thumb/d/db/Grand_Banks.png/300px-Grand_Banks.png
Not all of the economic impact was bad. The fertile fishing grounds of the present day Newfoundland Banks were thought to have been found by fisherman in the late 1400's who were looking for the fish stocks that had deserted their former grounds as the result of the movement of colder waters from the north (Lamb, 1995.)
English fisherman benefited by the southern movement of herring normally found in the waters off Norway. This increase in deep-sea fishing helped to build the maritime population and strength of the country (Lamb, 1995.) The failure of crops in Norway between 1680 and 1720 was a prime reason for the great growth of merchant shipping there. Coastal farmers whose crops failed turned to selling their timber and to constructing ships in order to transport these timbers themselves (Lamb, 1995.)
Social Unrest
Conditions during the LIA led to many cases of social unrest. The winter of 1709 killed many people in France. Conditions were so bad, a priest in Angers, in west-central France, wrote: "The cold began on January 6, 1709, and lasted in all its rigor until the twenty-fourth. The crops that had been sewn were all completely destroyed.... Most of the hens had died of cold, as had the beasts in the stables. When any poultry did survive the cold, their combs were seen to freeze and fall off. Many birds, ducks, partidges, woodcock, and blackbirds died and were found on the roads and on the thick ice and frequent snow. Oaks, ashes, and other valley trees split with cold. Two thirds of the vines died.... No grape harvest was gathered at all in Anjou.... I myself did not get enough wine from my vineyard to fill a nutshell." (Ladurie, 1971)
In March the poor rioted in several cities to keep the merchants from selling what little wheat they had left. The winter of 1739-40 was also a bad one. After that there was no spring and only a damp, cool summer which spoiled the wheat harvest. The poor rebelled and the governor of Liege told the rich to "fire into the middle of them. That's the only way to disperse this riffraff, who want nothing but bread and loot." (Ladurie, 1971)
Lamb (1995) reports the occurrence of cattle raids on the Lowlanders by Highlanders who were stressed by the deteriorating climate. In 1436, King James I of Scotland was murdered while hunting on the edge of the Highland region near Perth. The clan warfare grew so bad that it was decided that no place north of Edinburgh Castle was safe for the king so Edinburgh became the capital of the country.
In England, the effect of starvation and the poor condition of the country encouraged men to enlist during the War of the Roses (1455-1485.) As tillable land was converted to other uses such as sheep rearing, the landlords who organized the conversions became the focus of many hostilities.
One group in particular suffered from the poor conditions - people thought to be witches (Behringer, 1999.) Weather-making was thought to be among the traditional abilities of witches and during the late fourteenth and fifteenth centuries many saw a great witch conspiracy. Extensive witch hunts took place during the most severe years of the LIA, as people looked for scapegoats to blame for their suffering.
One of history's most notorious quotes might have been due in part to a rare extremely warm period during the LIA. In northern France in 1788, after an unusually bad winter, May, June, and July were excessively hot, which caused the grain to shrivel. On July 13, just at harvest time, a severe hailstorm (which typically occurs when there is very cold air aloft) destroyed what little crops were left. From that bad harvest of 1788 came the bread riots of 1789 which led to Marie Antoinette's alleged remark "Let them eat cake," and the storming of the Bastille.
Frequency of Storms
During the LIA, there was a high frequency of storms. As the cooler air began to move southward, the polar jet stream strengthened and followed, which directed a higher number of storms into the region. At least four sea floods of the Dutch and German coasts in the thirteenth century were reported to have caused the loss of around 100,000 lives. Sea level was likely increased by the long-term ice melt during the MWP which compounded the flooding. Storms that caused greater than 100,000 deaths were also reported in 1421, 1446, and 1570. Additionally, large hailstorms that wiped out farmland and killed great numbers of livestock occurred over much of Europe due to the very cold air aloft during the warmer months. Due to severe erosion of coastline and high winds, great sand storms developed which destroyed farmlands and reshaped coastal land regions.
Impact of Glaciers
http://www.topnews.in/files/swiss-glacier.jpg
During the post-MWP cooling of the climate, glaciers in many parts of Europe began to advance. Glaciers negatively influenced almost every aspect of life for those unfortunate enough to be living in their path. Glacial advances throughout Europe destroyed farmland and caused massive flooding. On many occasions bishops and priests were called to bless the fields and to pray that the ice stopped grinding forward (Bryson, 1977.) Various tax records show glaciers over the years destroying whole towns caught in their path.
North Atlantic Drift Ice
http://williamcalvin.com/img/AltanticMonthlyCurrentMap.jpg
Drift ice is carried from the arctic ice pack and the waters north of Iceland by ocean currents. In colder times, arctic waters carry the ice southward while in warmer times the Gulf Stream dominates the Iceland area, keeping drift ice away. Iceland and Greenland are far enough north to observe this ice but far enough south so that they are not always surrounded by drift ice. Drift ice was carefully observed by Icelanders both from shore and from ships because it threatened ships and therefore affected commerce. Drift ice can be considered a thermometer of the north Atlantic.
From 1846 to present, detailed records have been kept in Iceland that show the number of months drift ice appeared along with the temperature. Bergthorsson (1969) has estimated past north Atlantic temperatures using a drift ice vs. temperature correlation derived from recorded data. For example, he observed that if ice is sighted in 20 months of one decade and 22 months of the next decade, that second decade was about 0.1oC cooler than the first. By analyzing various clues to reports of drift ice, he applied this correlation to estimate temperatures back to 1591. Using other historical references to past climate, he extended his temperature estimates back to the year 900. Fig. 5 shows the results of his research and Fig. 6 shows the variation in amount of polar ice seen from Iceland (Lamb, 1977.) Both illustrate the MWP and the LIA quite well.
Impact on Agriculture
http://upload.wikimedia.org/wikipedia/commons/9/99/Vineyard_at_Wyken_Hall_-_geograph.org.uk_-_216836.jpg
English Vineyard
Lamb (1966) points out that in the warmest times of the last 1000 years, southern England had the climate that northern France has now. For example, the difference between the northen-most vineyard in England in the past and present-day vineyard locations in France is about 350 miles. In other terms that means the growing season changed by 15 to 20 percent between the warmest and coldest times of the millenium. That is enough to affect almost any type of food production, especially crops highly adapted to use the full-season warm climatic periods. During the coldest times of the LIA, England's growing season was shortened by one to two months compared to present day values. The availability of varieties of seed today that can withstand extreme cold or warmth, wetness or dryness, was not available in the past. Therefore, climate changes had a much greater impact on agricultural output in the past.
One of the worst famines in the seventeenth century occurred in France due to the failed harvest of 1693. Millions of people in France and surrounding countries were killed.
The effect of the LIA on Swiss farms was also severe. Due to the cooler climate, snow covered the ground deep into spring. A parasite, known as Fusarium nivale, which thrives under snow cover, devastated crops. Additionally, due to the increased number of days of snow cover, the stocks of hay for the animals ran out so livestock were fed on straw and pine branches. Many cows had to be slaughtered.
In Norway, many farms located at higher latitudes were abandoned for better land in the valleys. By 1387, production and tax yields were between 12 percent and 70 percent of what they had been around 1300. In the 1460's it was being recognized that this change was permanent. As late as the year 1665, the total Norwegian grain harvest is reported to have been only 67 - 70 percent of what it had been about the year 1300 (Lamb, 1995.)
Impact on Wine Production
People keep records of their most important crops, grapes for wine-making being no exception. Ladurie (1971) notes that there were many "bad years" for wine during the LIA in France and surrounding countries due to very late harvests and very wet summers. The cultivation of grapes was extensive throughout the southern portion of England from about 1100-1300. This area is about 300 miles farther north than the areas in France and Germany that grow grapes today (although hardy German strains are now grown in England once more (http://en.wikipedia.org/wiki/English_wine)).
Grapes were also grown in northern France and Germany at that time, areas which even today do not sustain commercial vineyards. At the time of the compilation of the Domesday Survey in the late eleventh century, vineyards were recorded in 46 places in southern England, from East Anglia through to modern-day Somerset. By the time King Henry VIIIth ascended the throne there were 139 sizeable vineyards in England and Wales - 11 of them owned by the Crown, 67 by noble families and 52 by the church (English-wine.com). In fact, Lamb (1995) suggests that during that period the amount of wine produced in England was substantial enough to provide significant economic competition with the producers in France. With the coming cooler climate in the 1400's, temperatures became too cold for grape production and the vineyards in southern England gradually declined.
German wine production also declined during the cooling experienced after the MWP and during the LIA. Between 1400 and 1700 German wine production was never above 53% of the production before 1300 and at times was as low as 20% of that production (Lamb, 1995.)
Impact on Forests During the Little Ice Age
http://planetearth.nerc.ac.uk/images/uploaded/medium/beech-forest-m.jpg
A study of the tree populations in forests of Southern Ontario by Campbell and McAndrews (1993) shows how the tree population in Europe might have been changed by the LIA. Their analysis of pollen demonstrated that after the year 1400, beech trees, the formerly dominant warmth-loving species, were replaced first by oak and subsequently by pine. Further, the forest under study appears to have remained in disequilbrium with the prevailing climate of today. That suggests that tree population distribution takes hundreds of years to recover from major climate changes.
Impact on Health
http://cbertel.files.wordpress.com/2011/02/france-ergot-st-anthonys-fire-cartoon-2.jpg
The cooler climate during the LIA had a huge impact on the health of Europeans. As mentioned earlier, dearth and famine killed millions and poor nutrition decreased the stature of the Vikings in Greenland and Iceland.
Cool, wet summers led to outbreaks of an illness called St. Anthony's Fire (Ergotism). Whole villages would suffer convulsions, hallucinations, gangrenous rotting of the extremities, and even death. Grain, if stored in cool, damp conditions, may develop a fungus known as ergot blight and also may ferment just enough to produce a drug similar to LSD. (In fact, some historians claim that the Salem, Massachusetts witch hysteria was the result of ergot blight.)
Malnutrition led to a weakened immunity to a variety of illnesses. In England, malnutrition aggravated an influenza epidemic of 1557-8 in which whole families died. In fact, during most of the 1550's deaths outnumbered births (Lamb, 1995.) The Black Death (Bubonic Plague) was hastened by malnutrition all over Europe.
One might not expect a typically tropical disease such as malaria to be found during the LIA, but Reiter (2000) has shown that it was an important cause of illness and death in several parts of England. The English word for malaria was ague, a term that remained in common usage until the nineteenth century. Geoffrey Chaucer (1342-1400) wrote in the Nun's Priest Tale:
You are so very choleric of complexion.
Beware the mounting sun and all dejection,
Nor get yourself with sudden humours hot;
For if you do, I dare well lay a groat
That you shall have the tertian fever's pain,
Or some ague that may well be your bane.
In sixteenth century England, many marshlands were notorious for their ague-stricken populations. William Shakespeare (1564-1616) mentioned ague in eight of his plays. Oliver Cromwell (1599-1658) died of ague in September 1658, which was one of the coldest years of the LIA.
Five indigenous species of mosquito are capable of transmitting malaria in England where they prefer the brackish water along river estuaries. The anaerobic bacterial flora of saline mud produces a strong sulfur odor that was widely believed to be the cause of agues in salt marsh areas (i.e. Shakespeare's "unwholesome fens.") The term malaria comes from the Italian term "mala aria" meaning "bad air."
Impact on Economics
In addition to increasing grain prices and lower wine production, there were many examples of economic impact by the dramatic cooling of the climate. Due to famine, storms, and growth of glaciers ,many farmsteads were destroyed, which resulted in less tax revenues collected due to decreased value of the properties (Lamb, 1995.)
Cod fishing greatly decreased, especially for the Scottish fisherman, as the cod moved farther south. The cod fishery at the Faeroe Islands began to fail around 1615 and failed altogether for thirty years between 1675 and 1704 (Lamb, 1995.) In the Hohe Tauern mountains of the Austrian Alps, advancing glaciers closed the gold mines of the Archbishop of Salzburg who was one of the wealthiest dukes in the empire. The succession of two or three bad summers where the miners could not rely on work in the mines caused them to find employment elsewhere, which resulted in an abrupt end to the mining operations (Bryson, 1977.)
http://upload.wikimedia.org/wikipedia/commons/thumb/d/db/Grand_Banks.png/300px-Grand_Banks.png
Not all of the economic impact was bad. The fertile fishing grounds of the present day Newfoundland Banks were thought to have been found by fisherman in the late 1400's who were looking for the fish stocks that had deserted their former grounds as the result of the movement of colder waters from the north (Lamb, 1995.)
English fisherman benefited by the southern movement of herring normally found in the waters off Norway. This increase in deep-sea fishing helped to build the maritime population and strength of the country (Lamb, 1995.) The failure of crops in Norway between 1680 and 1720 was a prime reason for the great growth of merchant shipping there. Coastal farmers whose crops failed turned to selling their timber and to constructing ships in order to transport these timbers themselves (Lamb, 1995.)
Social Unrest
Conditions during the LIA led to many cases of social unrest. The winter of 1709 killed many people in France. Conditions were so bad, a priest in Angers, in west-central France, wrote: "The cold began on January 6, 1709, and lasted in all its rigor until the twenty-fourth. The crops that had been sewn were all completely destroyed.... Most of the hens had died of cold, as had the beasts in the stables. When any poultry did survive the cold, their combs were seen to freeze and fall off. Many birds, ducks, partidges, woodcock, and blackbirds died and were found on the roads and on the thick ice and frequent snow. Oaks, ashes, and other valley trees split with cold. Two thirds of the vines died.... No grape harvest was gathered at all in Anjou.... I myself did not get enough wine from my vineyard to fill a nutshell." (Ladurie, 1971)
In March the poor rioted in several cities to keep the merchants from selling what little wheat they had left. The winter of 1739-40 was also a bad one. After that there was no spring and only a damp, cool summer which spoiled the wheat harvest. The poor rebelled and the governor of Liege told the rich to "fire into the middle of them. That's the only way to disperse this riffraff, who want nothing but bread and loot." (Ladurie, 1971)
Lamb (1995) reports the occurrence of cattle raids on the Lowlanders by Highlanders who were stressed by the deteriorating climate. In 1436, King James I of Scotland was murdered while hunting on the edge of the Highland region near Perth. The clan warfare grew so bad that it was decided that no place north of Edinburgh Castle was safe for the king so Edinburgh became the capital of the country.
In England, the effect of starvation and the poor condition of the country encouraged men to enlist during the War of the Roses (1455-1485.) As tillable land was converted to other uses such as sheep rearing, the landlords who organized the conversions became the focus of many hostilities.
One group in particular suffered from the poor conditions - people thought to be witches (Behringer, 1999.) Weather-making was thought to be among the traditional abilities of witches and during the late fourteenth and fifteenth centuries many saw a great witch conspiracy. Extensive witch hunts took place during the most severe years of the LIA, as people looked for scapegoats to blame for their suffering.
One of history's most notorious quotes might have been due in part to a rare extremely warm period during the LIA. In northern France in 1788, after an unusually bad winter, May, June, and July were excessively hot, which caused the grain to shrivel. On July 13, just at harvest time, a severe hailstorm (which typically occurs when there is very cold air aloft) destroyed what little crops were left. From that bad harvest of 1788 came the bread riots of 1789 which led to Marie Antoinette's alleged remark "Let them eat cake," and the storming of the Bastille.
Frequency of Storms
During the LIA, there was a high frequency of storms. As the cooler air began to move southward, the polar jet stream strengthened and followed, which directed a higher number of storms into the region. At least four sea floods of the Dutch and German coasts in the thirteenth century were reported to have caused the loss of around 100,000 lives. Sea level was likely increased by the long-term ice melt during the MWP which compounded the flooding. Storms that caused greater than 100,000 deaths were also reported in 1421, 1446, and 1570. Additionally, large hailstorms that wiped out farmland and killed great numbers of livestock occurred over much of Europe due to the very cold air aloft during the warmer months. Due to severe erosion of coastline and high winds, great sand storms developed which destroyed farmlands and reshaped coastal land regions.
Impact of Glaciers
http://www.topnews.in/files/swiss-glacier.jpg
During the post-MWP cooling of the climate, glaciers in many parts of Europe began to advance. Glaciers negatively influenced almost every aspect of life for those unfortunate enough to be living in their path. Glacial advances throughout Europe destroyed farmland and caused massive flooding. On many occasions bishops and priests were called to bless the fields and to pray that the ice stopped grinding forward (Bryson, 1977.) Various tax records show glaciers over the years destroying whole towns caught in their path.
North Atlantic Drift Ice
http://williamcalvin.com/img/AltanticMonthlyCurrentMap.jpg
Drift ice is carried from the arctic ice pack and the waters north of Iceland by ocean currents. In colder times, arctic waters carry the ice southward while in warmer times the Gulf Stream dominates the Iceland area, keeping drift ice away. Iceland and Greenland are far enough north to observe this ice but far enough south so that they are not always surrounded by drift ice. Drift ice was carefully observed by Icelanders both from shore and from ships because it threatened ships and therefore affected commerce. Drift ice can be considered a thermometer of the north Atlantic.
From 1846 to present, detailed records have been kept in Iceland that show the number of months drift ice appeared along with the temperature. Bergthorsson (1969) has estimated past north Atlantic temperatures using a drift ice vs. temperature correlation derived from recorded data. For example, he observed that if ice is sighted in 20 months of one decade and 22 months of the next decade, that second decade was about 0.1oC cooler than the first. By analyzing various clues to reports of drift ice, he applied this correlation to estimate temperatures back to 1591. Using other historical references to past climate, he extended his temperature estimates back to the year 900. Fig. 5 shows the results of his research and Fig. 6 shows the variation in amount of polar ice seen from Iceland (Lamb, 1977.) Both illustrate the MWP and the LIA quite well.