摘要
利用1951—2004年全国160站降水资料和NCEP/NCAR500hPa月平均资料,从中纬度西风环流、位势高度、纬向风、经向风、垂直速度场等方面,分析了长江中下游地区6—7月降水与500hPa大气环流的关系。结果表明,欧亚中纬度地区西风带多雨、少雨年均表现为长波的两槽两脊形势,但是槽脊系统差异显著。长江中下游地区降水与东亚500hPa上空位势高度场、纬向风、经向风、垂直速度场均有显著的关系,进一步证明了长江中下游地区6—7月降水与500hPa大气环流有密切关系。
Considering middle latitude westerly circulation, geopotential height, zonal wind, meridional wind and vertical velocity, the monthly average precipitation data from 160 stations in China during 1951--2004 and NCEP/NCAR reanalysis data are employed to analyze the relationship between the 500 hPa atmospheric circulation and the June--July precipitation of the midlower Yangtze River. The results show that there are two-troughs and two-ridges circulations in both wet and dry years in middle westerly zone and the differences between troughs and ridges are remarkable.The precipitation is closely related to geopotential height, zonal wind, meridional wind and vertical velocity, which further reveals the close relationship between precipitation and 500 hPa atmospheric circulation.
出处
《气象与减灾研究》
2009年第4期18-24,共7页
Meteorology and Disaster Reduction Research
基金
气象灾害省部共建教育部重点实验室项目(编号:KLME050103).
关键词
降水异常
500hPa大气环流
长江中下游
Mid-lower Yangtze River
Precipitation anomalies
500 hPa atmospheric circulation.
