中国区域水汽输送异常与长江流域旱涝的关系(英文)

编号 zgly0001585935

文献类型 期刊论文

文献题名 中国区域水汽输送异常与长江流域旱涝的关系(英文)

作者 蒋兴文  李跃清  王鑫 

作者单位 InstituteofPlateauMeteorology  ChinaMeteorologicalAdministration  Chengdu610071  China  ClimatecenterofSichuanProvince  Chengdu610071  China 

母体文献 Journal of Geographical Sciences 

年卷期 2009年02期

年份 2009 

分类号 P426.616 

关键词 watervaportransport  droughtandflood  complexEOF  YangtzeRiverBasin 

文摘内容 The characteristics of water vapor transport(WVT) over China and its relationship with precipitation anomalies in the Yangtze River Basin(YRB) are analyzed by using the upper-air station data in China and ECMWF reanalysis data in summer from 1981 to 2002.The results indicate that the first mode of the vertically integrated WVT is significant whose spatial distribution presents water vapor convergence or divergence in the YRB.When the Western Pacific Subtropical High(WPSH) is strong and shifts southward and westward, the Indian Monsoon Low Pressure(IMLP) is weak, and the northern part of China stands behind the middle and high latitude trough, a large amount of water vapor from the Bay of Bengal(BOB), the South China Sea(SCS) and the western Pacific forms a strong and steady southwest WVT band and meets the strong cold water vapor from northern China in the YRB, thus it is likely to cause flood in the YRB.When WPSH is weak and shifts northward and eastward, IMLP is strong, and there is nearly straight west wind over the middle and high latitude, it is unfavorable for oceanic vapor extending to China and no steady and strong southwest WVT exists in the region south of the YRB.Meanwhile, the cold air from northern China is weak and can hardly be transported to the YRB.This brings on no obvious water vapor convergence, and then less precipitation in the YRB.