摘要
利用南京6站近50 a(1960—2009年)的夏季逐日降水资料,应用累积距平、趋势系数、小波分析等方法,分析了南京地区夏季降水和旱、涝年的时空特征。结果表明,南京地区夏季降水量、雨日、暴雨日和暴雨日降水强度均有明显的年代际变化特征,其中降水量和暴雨日数的年代际变化基本一致;各站夏季降水量、雨日和暴雨日均呈增加趋势,总降水量的增加趋势主要是大雨及以上量级降水的贡献;夏季降水量存在2～8 a的周期变化;南京地区旱、涝年的夏季降水量与长江中下游地区有较好的一致性,与华南地区呈相反关系。
Using 50 a（1960--2009） summer daily precipitation data over 6 stations of Nanjing re- gion, both the temporal/spatial features of rainfall and flood/drought years are analyzed. The results indi- cate that precipitation, wet days, rainstorm days and their rain intensity all experience obvious interdecadal variation, and the precipitation as well as the rainstorm days follow the similar interdeeadal variation. The temporal trends of summer precipitation, wet days and heavy rain days are all positive. The weak increas- ing trend of total rainfall is mainly due to the heavy rain and the precipitation over it. The periodic varia- tion of 2 -8 a is found for summer precipitation. The precipitation amount in flood and drought years is consistent with that of the Lower-Middle Reaches of the Yangtze River but opposite to South China＇s.
出处
《气象科学》
CSCD
北大核心
2012年第6期646-652,共7页
Journal of the Meteorological Sciences
基金
科技部科技支撑计划资助项目(2011BAK21B04)
江苏省青年气象科研基金(Q200904
Q201106)
关键词
夏季降水
累积距平
趋势系数
小波分析
Summer precipitation
Accumulative anomaly
Trend coefficient
Wavelet analysis
