四川"9.3"大暴雨中的水汽输送分析

利用NCEP／NCAR再分析资料对四川“9．3”大暴雨中水汽来源进行了讨论。结果表明,这次暴雨的水汽主要来源于南海、西太平洋地区;异常水汽输送在这次暴雨中占了较大的比例。暴雨日及前3天的异常水汽输送表明,造成此次川东暴雨的异常水汽来源于西太平洋经南海、东海、黄海的向北水汽输送和暴雨区北方的向南水汽输送,以及青藏高原的异常偏西风输送,孟加拉湾的水汽输送对异常强降水并没有明显的作用。大暴雨发生的前期,副高突然异常加强西伸。

Analysis of vapor transport in "9.3" heavy rain in Sichuan

The vapor transport of the "9.3" heavy rain in Sichuan is studied based on the NCEP/NCAR reanalysis data.It is found that the vapor in the heavy rain is mainly from the South China Sea and the west Pacific Ocean.The anomalous vapor transport gives a bigger contribution to the heavy rain.It comes from the northward vapor transport in the South China Sea,the west Pacific Ocean,the East Sea and the Yellow Sea and the southward vapor transport from north and the Plateau.The vapor transport from the Bay of Bengle does not play an obvious role in the heavy rain.The subtropical high in the western Pacific anomaly strengthens and moves westward before the onset of the heavy rain.