我国南方地区夏季低温变化特征及其成因  

Characteristics of Cold Summer Events in Southern China and Their Relations with Variations of Asian Summer Monsoon

作　　者：蔡佳熙[1] 管兆勇[1] 

机构地区：[1]南京信息工程大学大气科学学院

出　　处：《南京气象学院学报》2007年第6期799-806,共8页Journal of Nanjing Institute of Meteorology

基　　金：江苏省"六大人才高峰"项目;江苏省气象灾害重点实验室资助项目(KLME060101)

摘　　要：采用中国气象局整编的日平均气温资料、NCEP/NCAR再分析日平均资料,分析了1960—2004年我国南方地区尤其是长江中下游地区夏季低温的变化特征及成因。结果表明:我国南方地区夏季气温在20世纪70年代末出现一个转折,在此之前气温普遍偏低,在此之后气温普遍升高;江南地区是夏季低温频发且强度较大的区域;各个层次高度场环流形势的变化以及降水和总云量的变化都对夏季低温的形成有一定作用。Using the daily average temperature data from China Meteorological Administration and the NCEP/NCAR reanalysis data, we have analyzed the features of summertime low temperature events in the southern part of China, especially in the middle and lower reaches of the Yangtze River, and the related circulation changes from 1960 to 2004. Our results show that summer temperature trend change its sign in the late 1970s ;the temperature was lower than normal before the late 1970s and higher after that time. The low temperature events occurred more frequently over the south of the Yangtze River. Both the general circulation changes at different levels and variations of the precipitation along with the total cloud cover were responsible for the formation of low temperature events during boreal summer season.

关 键 词：南方地区 夏季低温 环流变化 

分 类 号：P463[天文地球—大气科学及气象学]