江苏冬夏季人体舒适度指数异常的背景场研究

利用江苏地区37个气象观测站1980—2009年逐日资料,及同时段美国NCEP/NCAR再分析资料以及北太平洋海温资料,通过合成和遥相关法,研究了当江苏冬、夏季人体舒适度指数（CIHB）出现异常偏高和偏低时,大气环流与北太平洋海温场的基本特征。结果表明：（1）CIHB偏高年较偏低年,冬季,东亚大槽偏浅,冬季风明显偏弱,尤其是北风分量偏弱最为明显,江苏上空下沉气流偏弱,均不利于冷空气东移南压以及向下入侵;夏季,副热带高压偏西、偏强,南亚高压偏东、偏北、偏强,夏季风明显偏强,尤其是南风分量偏强显著,导致往北的暖湿气流强盛,垂直运动总体偏弱,不利于夏季对流活动的发生。（2）冬季,CIHB偏高年中西太平洋的海温高于偏低年,尤其是在我国东部近海的黑潮区,偏暖幅度最为明显,无论是超前相关还是同期相关,西太平洋海温与冬季CIHB都是以正相关为主,其中暖池区的正相关最为显著。

Study on Physical Background of Comfort Index of Human Body Anomaly in Winter and Summer in Jiangsu Province

The daily meteorological data at 37 stations in Jiangsu Province,the NCEP/NCAR reanalysis data of monthly mean geopotential height and wind fields,and the data of the North Pacific sea surface temperature (SST) from 1980 to 2009 are analyzed by methods of composite and teleconnection.The characteristics of atmospheric circulation and North Pacific SST were studied when comfort index of human body (CIHB) was anomalous in winter and summer.The results indicated that:(1) the cold air force in winter is weaker when the CIHB is higher than that when the CIHB is lower.Because East Asian trough is shallower, winter monsoon is weaker especially the north wind and downdraft are also weaker at the stage of higher CIHB than lower CIHB.In summer,subtropical high was found to be westward and strengtherning and South Asia high lies easterly and northerly and strengtherns in the higher CIHB stage,including the stronger summer monsoon and weaker vertical convection.(2) In winter,SST in the Midwest Pacific at the stage of higher CIHB is warmer than the lower CIHB,particularly in Kuroshio in China eastern offshore. No matter the leading or contemporaneous correlation,the correlation between the West Pacific SST and the CIHB in winter is positive mainly,especially in Kuroshio.