Different Features of April-June Vapor Source/Transport during Drought/Flood Years in South China

摘要

Using CMAP, daily observatory rainfall data and NCEP/NCAR reanalysis data, climatic features of moisture transport and its differences between flood years and drought years during the first rainy season of South China (SC) are discussed. Results show that moisture transport influencing South China exhibit distinct difference before South China Sea Summer Monsoon (SCSSM) onset and after SCSSM onset. Therefore the first rainy season of SC should be divided into two stages: from April to SCSSM onset and from SCSSM to June. Variations of moisture transport from the West Pacific and North China have important effects on flood or drought of SC. But that from Arabian Sea-Bay of Bangle mainly influences local rainfall instead of abnormal rainfall over SC.