江苏省“五一”期间降水变化特征及极端异常天气分析  

Analysis on Characters of Precipitation and Extreme Wheather in Jiangsu during 1st—7th May

作　　者：张娇[1] 郭品文[1] 刘海文[1] 

机构地区：[1]南京信息工程大学大气科学系,江苏南京210044

出　　处：《南京气象学院学报》2004年第5期681-687,共7页Journal of Nanjing Institute of Meteorology

基　　金：江苏省自然科学基金资助项目(BK20011106)

摘　　要：利用1961—1999年江苏省60站逐日降水量资料和NCEP/NCAR再分析逐日风场资料分析研究了江苏省"五一"期间降水的时空分布特征及其大气环流背景。结果表明:江苏省"五一"前后降水量的时间变化特征与南海夏季风建立进程有关;"五一"期间降水存在着明显的区域变化特征,可分为苏南和苏北两区。进一步分析"五一"期间降水极端异常年份对应的全国同期降水分布特征和低层流场特征发现:降水中心与气候平均状况相比明显偏北,且西太平洋副热带高压在南海夏季风建立过程中出现了明显的异常。In the context of the daily precipitation data of 60 stations in Jiangsu from 1961 to 1999 and the daily reanalysis wind field data from NCEP/NCAR,the spatial-temporal variation characters of precipitation in Jiangsu and the background of atmosphere general circulation during 1st—7th May are analyzed.Results indicate that the temporal variation characters of precipitation are related to the course of summer monsoon onset in the South China Sea;and Jiangsu can be divided into the southern and northern areas of precipitation variation.The distributive characters of precipitation and 850hPa wind field are also analyzed in the year when the extreme precipitation occurred in Jiangsu during 1st—7th May,and it is found that the precipitation lay obviously north of the climatological normal and the subtropical high of the west percific appeared obviously abnormal in the extreme year.

关 键 词：“五一”期间 南海夏季风 副热带高压 

分 类 号：P458.2[天文地球—大气科学及气象学]