摘要
着眼于东亚海陆热力强迫差异的影响,探讨了东亚初夏环流与江淮梅雨成因。结果表明:江淮流域夏季降水与前期地面气温的东亚纬向海陆热力差异相关;江淮流域初夏降水量与同期北半球500hPa位势高度场的高相关区对应于入梅期“双阻”型环流系统,且最高相关系统为副热带高压。数值试验表明,东亚海陆热力强迫的差异与夏季风、梅雨阻塞系统的形成密切相关。研究结果揭示了梅雨初期环流特征形成的机理与热力结构因素。
In this paper,with a view to the effect of sea-land thermal forcing contrast in East Asian,the early summer circulation in East Asia and Meiyu cause of formation in Jianghuai valley are studied. The results show that the summer precipitation in Jianghuai valley is related to zonal sea-land thermal contrast in East Asia of early days surface air temperature.The high correlation area between early summer precipitation in Jianghuai valley and corresponding-period 500hPa geopotential height field of the northern hemisphere corresponds to the circulation system of 'double blocking'pattern at the entering period of Meiyu with the highest correlation system being subtropical high. The numerical experiments indicate that sea-land thermal forcing contrast in East Asia is closely related to summer monsoon and the formation of Meiyu blocking system. The forming mechanism of circulation features and thermal structure factors at the first period of Meiyu are revealed.
出处
《南京气象学院学报》
CSCD
1993年第4期471-478,共8页
Journal of Nanjing Institute of Meteorology
关键词
大气环流
梅雨
成因
sea-land thermal contrast,early summer circulation,Meiyu cause of formation,thermal structure,numerical experiment
