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Changes in annual accumulation retrieved from Geladaindong ice core and its relationship to atmospheric circulation over the Tibetan Plateau

查看全文 作　　者：ZHANG [1,2]YongJun;KANG [1,3]ShiChang;QIN [3]DaHe;GRIGHOLM [4]Bjorn;MAYEWSKI Paul [4]A. 高影响力作者 机构地区：[1]Institute of Tibetan Plateau Research, Chinese Academy of Sciences (CAS), Beijing 100085, China;[2]Graduate School of CAS, Beijing 100049, China;[3]National Key Laboratory of Cryospheric Sciences, CAS, Lanzhou 730000, China;[4]Climate Change Institute, University of Maine, Orono, ME 04469, USA高影响力机构 出　　处：《Chinese Science Bulletin》索引2007年第52卷第23期,共6页高影响力期刊 基　　金：Supported by the National Natural Science Foundation of China (Grant No. 40401054 and 40121101);the National Basic Research Program of China (Grant No. 2005CB422004);the 'Talent Project' and Innovation Project of Chinese Academy of Sciences (Grant Nos. KZCX3-SW-339 and 334);Dean Foundation of CAS 摘　　要：Annual accumulation records covering 1935 to 2004 were reconstructed using Geladaindong ice core in the source of Yangtze River. A significant positive correlation between annual accumulation and precipitation from nearby meteorological stations was found, suggesting ice core accumulation could be taken as a precipitation proxy in the region. In the past 70 years, precipitation in the Geladaindong region was low from 1930s to early 1960s, and the lowest value occurred in the later 1950s. Since 1960s, precipitation increased dramatically and reached the maximum around 1980s, then decreased slightly in 1990s. By using Mann-Kendall rank statistical test method, a change point for precipitation was de- termined in 1967. Analysis of the atmospheric circulation over the Tibetan Plateau suggested that, compared with the southwest wind during the low precipitation period (before 1967), it extended about 2 latitudes northward during high precipitation period (after 1967). Moreover, during the high precipita- tion, the trough over the Bal Karshi Lake was also enhanced, and both the meridional wind and vapor transporting displayed a remarkable aggrandizement. 关 键 词：大气循环 西藏 气候学 物质蓄积
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