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《Journal of Glaciology and Geocryology》 2004-05
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Relation between Abnormity of East Asian Summer Monsoon and Summer Precipitation in East Part of Northwest China

WANG Bao-jian~(1,2),LI Dong-liang~(3),HUANG Yu-xia~(4),WANG Jin-song~(1) (1.Lanzhou Institute of Arid Meteorology, Chinese Meteorology Administration, Lanzhou Gansu 730020, China; 2.Gansu Province Meteorology Bureau, Lanzhou Gansu 730020, China; 3.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Science, Lanzhou Gansu 730000, China; 4.The Professional Meteorological Observtory of Gansu, Lanzhou Gansu 730020, China)  
Analyzing the correlation of East Asian summer monsoon and drought/flood phenomena in Northwest China, as well as the evolution characteristics of vapor flux and its divergence flux field, height field and u-v wind field at strong and weak summer monsoon years, the following results are obtained East Asian Summer Monsoon (EASM) mainly affects the precipitation in the eastern region (100° E ); In the strong summer monsoon year, the height field is low on the west and high on the east. In addition, the west wind in latitude direction and the south wind in longitude direction and vapor flux transportation in west and southwest winds are evidently boosted up. There is a vapour flux confluence in the northwest region under the influence of EASM. In the weak summer monsoon year, there is drought and scarce precipitation mostly. In the northwest region under the influence of EASM, west wind in latitude direction and south wind in longitude direction, as well as moisture transportation by west and southwest wind, are remarkably reduced, with a vapour flux divergence in the northwest region under the influence of EASM.
【Fund】: 国家自然科学基金项目(40475038);; 中国科学院寒区旱区环境与工程研究所知识创新工程项目(CACX2004117)资助
【CateGory Index】: P426.42
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