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QUANTITATIVE RECONSTRUCTED CLIMATIC CHANGES OF DAIHAI BASIN BY POLLEN DATA
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2003
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EngineeringEarth System ScienceEarth ScienceHolocenePaleoenvironmental ChangeAtmospheric ScienceQuantitative Climatic ChangesClimate ChangeHydrometeorologyMeteorologyGeographyMean July TemperatureCore 99APaleoclimatologyEarth's ClimateClimate DynamicsClimatologyDroughtPollen DiagramGlobal ClimatePhenology
Quantitative climatic changes of mean July temperature and mean annual precipitation have been reconstructed using pollenclimate response surfaces conducted by SUN Xiangjun et al(1996) from pollen data of core 99a in the Daihai Lake. Mean July temperature was 2～3 ℃ higher and annual precipitation were 100～180 mm more than those of today during the warm and humid periods. Mean July temperature was 2～3 ℃ lower and annual precipitation were 40～120 mm less than those of today during the cold and dry periods. Several cold and humid or cold and dry events or temperature rising events took place during the Holocene. The cold and dry events happened in the periods of 10 270, 9 500, 4 400～4 200, 2 800～1 650 aBP, cold and humid events happened in the periods of 7 600～7 400 and 5 800～5 600 aBP, and temperature rising events happened in the periods of 3 750～3 500 and 1 650～1 350 aBP. Except the cold and dry event during 2 800～1 650 aBP, most of the events lasted about 200～300 years.