东亚冬季风的区域差异和突变特征

Regional Differences and Abrupt Change Characteristics of East Asian Winter Monsoon in Different Regions

使用1957年9月1日—2002年8月31日共45年ECWMF的温度场、海平面气压场和风场再分析资料,采用EOF、REOF相结合的方法,对东亚冬季风进行了区域划分,即蒙古区、日本区及中国东部区。分析3个分区的区域平均1000 hPa温度、海平面气压、风场和降水随时间的变化特征后,发现各个分区的物理量演变存在非常明显的差异,认为对冬季风活动进行区划研究是必要的;同时发现风场中风向在冬季风的建立和撤退时较易出现突变特征。对各个分区的风场进行了气候突变检验,得到各个分区冬季风建立和撤退的不同日期。

Using the ECWMF reanalyzed data of temperature,sea level pressure(mslp) and from 1 September 1957 to 31 August 2002 the east Asian winter monsoon region was divided into three sub-regions: Mongolia region,Japan region and East China region.The changing characters of 1000 hPa temperature,mslp,wind and precipitation along time were analyzed and apparent differences of the evolvement were found among the three sub-regions,according to which we can regard it necessary to divide Asian winter monsoon into sub-reg...