地气系统净辐射加热的季节变化及其与亚洲夏季风的关系

THE SEASONAL CYCLE OF THE NET RAdIATION HEATING AT THE TOP OF ATMOSPHERE ANd ITS RELATIONSHIP WITH THE ASIAN SUMMER MONSOON

利用卫星观测的外逸长波辐射（ＯＬＲ）资料、大气层顶短波净辐射（ＳＨＴ）资料以及美国国家环境预报中心（ＮＣＥＰ）的环流资料，分析了地气系统净辐射加热（ＱＲＴ）的季节性演变及其与亚洲夏季风的关系。结果表明，ＱＲＴ的纬向偏差（ＱＲＴＤ）反映了海陆间的热力差异，ＱＲＴＤ随着季节的变化，海陆之间存在突变性反向，由春季到夏季，这种季节性反向要比大气环流的突变早一个月，它可能是导致亚洲夏季风建立和撤退的关键因素。

In this paper,the net radiation heating(QRT) at top of the atmosphere(TOA), i.e. the net thermal forcing on the upper boundary of the earth atmosphere system,are derived from the satellite observed outgoing long wave radiation(OLR) and the TOA short wave net irradiance(SHT).Analyses focus on the climatic feature of the seasonal cycle of the QRT and its relationship with the Asian summer monsoon(ASM). Results show that the evolution of the QRTD(deviation of the QRT from latitudinal mean),which is controlled by the land/sea contrast,experiences rapid seasonal reversals between continents and oceans.From spring to summer,the reversal leads one month to the abrupt change in the atmospheric circulation,which may play a key role in the onset of the ASM.