一种基于整层水汽通量的南海夏季风爆发指数

An Index of South China Sea Summer Monsoon Onset Based on Vertically Integrated Moisture Transport

利用1951～2000年的NCEP/NCAR逐日再分析风场、比湿和海平面气压资料,得到南海区域的整层水汽通量。根据南海夏季风爆发前后水汽通量的特征分析,定义了南海夏季风爆发指数IVIMT,并确定出1951～2000年南海夏季风的爆发日期。通过分析发现,利用该指数可以合理地确定南海夏季风的爆发时间。

The vertically integrated moisture transport （VIMT） of South China Sea （SCS） is obtained based on 1951-2000 50-year NCEP/NCAR reanalysis daily dataset of wind, specific humidity and surface pressure. An index of SCS summer monsoon onset （IVIMT） is defined according to the characteristics analysis of VIMT before and after the SCS summer monsoon onset, then the onset dates of the SCS summer monsoon from 1951-2000 are ascertained with the index IVIMT. By analysis it is found that the onset dates of the SCS summer monsoon can be reasonably defined with the index IVIMT.