长江中下游梅汛期强降水过程非均匀特征  

STUDY ON HETEROGENEITY CHARACTERISTICS OF DURATIVE HEAVY PRECIPITATION DURING THE MEIYU PERIOD IN LOW-MIDDLE REACH OF YANGTZE RIVER

作　　者：杜银[1] 张耀存[1] 谢志清[2] 杨红梅 

机构地区：[1]南京大学大气科学系,南京210093 [2]江苏气象科学研究所,南京210008 [3]江苏省连云港气象局,连云港222006

出　　处：《气象科学》2007年第2期133-139,共7页Journal of the Meteorological Sciences

基　　金：江苏省自然科学基金项目(编号:BK2005163);国家自然基金项目(编号:40333026;40233037)共同资助

摘　　要：根据长江中下游地区205站1960—2004年的逐日降水量和梅雨期的特征参数,计算并分析了长江中下游地区梅汛期暴雨降水过程降水量、集中度和集中期的时空非均匀特征。结果表明:长江中下游梅汛暴雨降水量、暴雨日数显著增加,而集中度和集中期无明显变化;暴雨降水量和暴雨降水集中程度在时空上的叠加是造成长江中下游地区大旱大涝趋势加重的重要原因之一。Based on 205 stations daily precipitation datasets and the characteristic parameters of the Meiyu period in low-middle reach of Yangtze River from 1960 to 2004, the rainfall , the precipitation-concentration degree （PCD） and precipitation-concentration period （PCP） of rainstorm event were calculated to analyze their heterogeneous characteristics , mainly including spatial and temporal distributions. It is proved that the precipitation and day of rainstorm increase heavily, but the PCD and PCP do not have the notable change. One of the important reasons that the great drought and great flood is made heavier in the lower reaches of Yangtze River is resulted from adding the precipitation and PCP of rainstorm including spatial and temporal distributions.

关 键 词：梅雨 集中度(PCD) 集中期(PCP) 气候趋势系数 

分 类 号：P462[天文地球—大气科学及气象学]