重庆汛期降水与西太平洋副热带高压的关系

Relationship between the rainfall in flood season in Chongqing and West Pacific Subtropical High

摘要: 利用近47a(1960～2006年)完整而系统的副高特征指数资料和重庆34个站点的汛期(6～8月)降水量资料进行相关普查,得出副高脊线、北界位置与重庆汛期降水之间都存在很高的正相关关系.当西太平洋副高偏北时,重庆汛期降水将会偏少;而当副高偏南时,该地区的降水将偏多.因此,重点讨论副高南北位置的变化与重庆汛期降水的关系.研究表明副高南北位置的异常对应着欧亚地区特别是东亚地区大气环流的异常变化,从而影响重庆乃至中国的汛期降水.

Abstract: Based on the monthly subtropical high indexes in summer and meteorological data of flood season ( June—August ) rainfall during 1960—2006 observed by 34 meteorological stations,the correlation coefficients between them is studied.The results indicate that the correlation coefficients between the ridge,north boundary of West Pacific Subtropical High and flood season rainfall is markedly.When the West Pacific Subtropical High is located north (south) in summer,the flood season rainfall in Chongqing is less (more).Wherefore,the relationship between the anomaly latitudinal position of West Pacific Subtropical High and flood season rainfall in Chongqing is studied.It is shown that the anomaly latitudinal position of West Pacific Subtropical High goes with the anomaly change of atmospheric circulation in East Asia,which influents the flood season rainfall in China and Chongqing.