Winter temperature in China during the last 500 years was constructed based on historical data about the freeze-up events, the heavy snow and the agricultural damages brought about by cold weathers in East China (25&#...Winter temperature in China during the last 500 years was constructed based on historical data about the freeze-up events, the heavy snow and the agricultural damages brought about by cold weathers in East China (25°N--35°N, 115°E--120°E). Fisrt, the data about the freezing of rivers and lakes and those about snowfall in this region were compiled and evaluated on the basis of an ordinal scale. Then the series of freeze-up events and heavy snow were produced separately and the combination of these series was made to generate a consistent series that reflects the changes in the degree of coldness in winter during the last 500 years. Finally, a reconstruction of winter temperature was carried out at a resolution of 10 years based on a calibration of a regression between recent temperature observations and the cold winter series constructed.展开更多
Abstract: In 1876 Blytt proposed a post-glacial climatic classification, maintaining that the then temperature fluctuated 1–2°C higher or lower than that today. Lamb (1969) held that in Europe “the axis of the ...Abstract: In 1876 Blytt proposed a post-glacial climatic classification, maintaining that the then temperature fluctuated 1–2°C higher or lower than that today. Lamb (1969) held that in Europe “the axis of the subtropical high pressure belt was generally displaced north by about 10° latitudes” during the Hypsithermal and that the temperature was three to six times higher than that in the postglacial period.展开更多
文摘Winter temperature in China during the last 500 years was constructed based on historical data about the freeze-up events, the heavy snow and the agricultural damages brought about by cold weathers in East China (25°N--35°N, 115°E--120°E). Fisrt, the data about the freezing of rivers and lakes and those about snowfall in this region were compiled and evaluated on the basis of an ordinal scale. Then the series of freeze-up events and heavy snow were produced separately and the combination of these series was made to generate a consistent series that reflects the changes in the degree of coldness in winter during the last 500 years. Finally, a reconstruction of winter temperature was carried out at a resolution of 10 years based on a calibration of a regression between recent temperature observations and the cold winter series constructed.
文摘Abstract: In 1876 Blytt proposed a post-glacial climatic classification, maintaining that the then temperature fluctuated 1–2°C higher or lower than that today. Lamb (1969) held that in Europe “the axis of the subtropical high pressure belt was generally displaced north by about 10° latitudes” during the Hypsithermal and that the temperature was three to six times higher than that in the postglacial period.
