ANALYSES OF FEATURES AND MECHANISMS OF SUMMER MONSOON ONSETS OVER SCS AND ITS VICINITY IN 1998

In the context of reanalysis NCEP/NCAP daily data and SST in 1998, the features and mechanisms of summer monsoon onset over the South China Sea (SCS) are investigated. Results show that SCS and its vicinity summer monsoon can be divided into three phrases with different characteristics. SST of SCS increases to its maximum suddenly before SCS summer monsoon onset. The conversion of sensible heat flux between sea and land may be an important factor that induces onsets of East Asia subtropical monsoon and SCS monsoon.