1982年夏季印缅槽和澳大利亚冷高压的中期振荡及其与广东降水的关系

本文利用1982年7—9月地面气压,850、500hPa高度和温度,广东地区测站的雨量等资料,进行功率谱、交叉谱、凝聚谱以及相关系数的计算。结果表明,这年夏季,印缅槽存在准三周的周期振荡,澳大利亚冷高压存在准两周的周期振荡,两者叠加的结果,与广东地区降水存在的准两周和准一周的振荡周期相吻合。研究还指出,这两个系统的周期变化比广东地区的降水超前1—3天。 

MEDIUM-RANGE OSCILLATIONS FOR THE INDOCHINA-BURMA TROUGH AND THE AUSTRALIAN COLD HIGH AND THEIR RELATIONSHIP WITH PRECIPITATION IN GUANGDONG IN THE SUMMER OF 1982

Using surface pressure,height and temperature data at 850 and 500 hPa.and rainfall records in Guangdong stations for July-September, 1982, power spectrum, cross spectrum, coagulation spectrum and correlation coefficient are derived in this paper.It shows that there is a quasi-3-week oscillation for the Indochina-Burma Trough and quasi-biweekly oscillation for the Australian Cold High and that their superimposed result is consistent with the quasi-biweekly and quasi-weekly oscillations for the precipitation in Guangdong.It is also shown that the periodic variations in the former two systems take place 1-3 days in advance of the ones in Guangdong precipitation.