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《Journal of Glaciology and Geocryology》 2005-04
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Progress of Research on "8.2 ka BP Cold Event"

WANG Jie~1,ZHOU Shang-zhe~\{1, 2\},XU Liu-bing~1(1.Key Laboratory of Western China's Environmental Systems of Ministry of Education of China and Department of Geography,Lanzhou University, Lanzhou Gansu 730000, China; 2.Department of Geography, South China Normal University,Guangzhou Guangdong 510631, China)  
The "8.2 ka BP cold event" had already been proposed by Beget in 1983, and confirmed further in the study of Greenland ice core. It is clear that the cold event occurred 8.4 to 8.0 cal ka BP, and lasted about 400 hundred years. At that time the lowest temperature had decreased (62) , and was half as large at the Younger Drays deviations. This paper is written based on a review of recent articles and papers, focusing those abrupt climate changes during 8.4~8.0 cal ka BP. It is found that many proxies recorded in ice core, stalagmite, marine and lake sediments indicate the cold event. Appearance of the cold event in the early Holocene is summarized, and its triggering mechanisms and regional climate responses are also discussed. According to the appearance of many kinds of climate records, "8.2 ka BP cold event" was not a local cold event, but a global cold one. Agassiz and Ojibway Lakes draining catastrophically -8.47 cal ka BP might be responsible for the abrupt cold event of 8.4~8.0 cal ka BP in North Atlantic. Furthermore, solar insolation lowing or solar activity weakening around 8.4~8.0 cal ka BP might enhance the cold event. Owing to the westerly wind shifting northward and monsoon weakening, the regional climate response to the cold event is different from place to place: cold and dry in middle and high latitudes in Europe and east Asia; decreased precipitation and increased windiness throughout much of the eastern two-thirds of the United States; arid controlling dominantly the climate in Central-America, Africa continent and Arabia; cooler, wetter conditions occurring generally in eastern Europe and Mediterranean basin; very low effective moisture in the Amazon basin and in the Chilian and Bolivian Altiplano.
【Fund】: 国家自然科学基金项目(4037101349971080);; 国家重点基础研究发展规划项目(G1998040811)资助
【CateGory Index】: P467
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