热带气象学报（英文版）
熱帶氣象學報（英文版）
열대기상학보（영문판）
JOURNAL OF TROPICAL METEOROLOGY
2004年
2期
190-200
,共11页
onset of the SCS summer monsoon%atmospheric heat source%Hadley circulation
The characteristics of atmospheric heat source associated with the summer monsoon onset in the South China Sea (SCS) are studied using ECMWF reanalysis data from 1979 to 1993. A criterion of the SCS summer monsoon onset is defined by the atmospheric heat source. Applying this criterion to the 15-year (1979 - 1993) mean field, the onset of the SCS summer monsoon is found to occur in the fourth pentad of May. And this criterion can also give reasonable results for the onset time of the SCS summer monsoon on a year-to-year basis. In addition, pretty high correlation has been found between the onset time of the SCS summer monsoon and the zonal mean vertically integrated heat source <Q1> at 40(S in April. The causes for the late or early onset of the SCS summer monsoon and the close relationship between the onset time and the zonal mean vertically integrated heat source <Q1> at 40 (S in April might be explained by the variations in intensity of the Hadley circulation.
