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《SCIENTIA GEOGRAPHICA SINICA》 2000-01
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Recent Climatic Change and Its Chemical Records in Lake Erhai

CHEN Jing an, WAN Guo jiang, CHEN Zhen lou, HUANG Rong gui (State Key Lab of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang Guizhou 550002)  
As a main lodging of surface substances, the plateau lake sediment continuously records the information of regional climate and environment with high resolution, and has major implications for reconstructing short time scale climatic changes. Through careful sampling of recent sediments and accurate dating by radionuclides, the evolutionary history of the regional climate and environment in recent 650 years is reconstructed successfully by chemical records in sediments of Lake Erhai. The results show that the CaO/(MgO·Al 2O 3)ratio in sediments can indicate palaeotemperature changes while the (CaO+K 2O+Na 2O)/Al 2O 3, Sr/Ba, Ca/Mg ratios have the palaeoclimate implications for revealing the aridity/humidity changes, according to it three climate phases are revealed: the warm dry period within 1340-1570AD,the cold humid period within 1570-1800AD and the warm dry period since 1800AD. This suggestes that the climatic succession type in the region of Lake Erhai is the warm dry and the cold humid alternatively and there exists 200 years time scale climatic quasi periodical changes. At present, it is at the end of the warm dry period and at the beginning of the cold humid period, so the temperature will fall and the precipitation will increase. On the one hand, the regional climate in Lake Erhai shows consistency with the global climate. On the other hand, it takes on specific regional characteristics. Therefore, to strengthen palaeoclimate study in this region is very important and meaningful in theory and reality for extending contents of global changes, realizing climatic change characteristics in the southwest monsoon zone and perfecting the Asian paleomonsoon study.
【Fund】: 国家自然科学基金!(批准号 :49894170 );; 中国科学院重大项目专题资助项目!(KZ95 1-A1-4 0 2 -0 6-0 4)
【CateGory Index】: P532.42
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