强弱南海夏季风年水汽输送路径特征分析

Characteristics of the water vapor transporting path in strong and weak SCS summer monsoon years

提出了一种量化水汽输送路径的方法,基于NCEP/NCAR再分析资料研究了南海强、弱夏季风年水汽输送路径的特征.结果表明:南海强夏季风年水汽输送路径偏东偏南;弱夏季风年水汽输送路径偏西偏北,且弱夏季风年水汽输送路径呈抛物线型.南海夏季风活动和夏季风槽的异常必然引起水汽输送的异常,而南海地区水汽输送强度与前期黑潮区域海温异常存在密切联系.

A method of quantifying the path of water vapor transport is put forward in this paper, and characteristics of water vapor transport over South China Sea （SCS） in strong and weak summer monsoon years are investigated based on the method and NCEP/NCAR reanalysis data. The results show that the paths of water vapor transport in strong summer monsoon years are located more southeastward than normal,whereas the paths of water vapor transport in weak summer monsoon years,which display a para-curve,are located more northwestward than normal. The anomalous SCS monsoon along with its summer monsoon trough leads to the anomalous water vapor transport of SCS monsoon. Tracks along which the water vapor is transported shift largely in zonal direction between strong and weak SCS monsoon years, which induces anomalous summer precipitation in China. The intensity of vapor transport is found to be significantly related to the sea surface temperature variations in tropical Indian Ocean and Krushio region.