【摘要】 根据太平洋（10°S-50°N，120°E-80°W）286个网格点1951-1986年逐月平均海温资料和同期西南地区34个站月平均降水资料1），利用交叉相关场EOF分解考察我国西南地区夏季降水与太平洋海温遥相关的结构;然后通过聚类对西南地区夏季降水分成两种基本型，分别对两种降水型对应的各季海温进行距平和复自然正交（CEOF）的合成分析。结果表明:太平洋中高纬地区和赤道东太平洋海温与我国西南四川、贵州等地存在明显的季节变化遥相关;两种降水型对应的海温异常分布，无论是距平结构还是振荡传播，均有明显的两类相反特征。更多还原

【Abstract】 By applying the data of sea surface temperature (SST) of Pacific Ocean (10°S- 5O °N, 12O° E - 8O°W), and the data of monthly mean precipitation of 34 weather stations in the Southwestern China from 1951 to 1986, this paper reports use of the empirical funtion (EOF) to analyze the correlation between the sununer predpitation in Southwestern China and the seasonal SST, clustering analysis to obtain two different precipitation patterns, and discusses the seasonal SST variation’s responee to the two kinds of precipitation patterns. The results indicated that there was an obvious seasonal correlation between the SST at mid-high latitude and the equatorial Eastern Pacific Ocean and some regions of Sichuan and Guizhou, and the spring was one which changcd the nature of this correlation, Seasonal SST anomalies in the two kinds of precipitation pattems, which included anomaly and oscillation propagation, were obviously different- El Nifio event I, which began,with bullding up of heat west Of the equatorial Eastern Pacific Ocean, affected precipitation pattern Ⅱ, while El Niho event which began with bullding up over the equtorial Eastern Pacific Ocean, affected precipitation pattern I. The relation of the two the kinds of El Nitio events to the two precipitation patterns were illustrated by the changcs of subtropical high pressure which was caused by the differences of SST of the equatorial Eastern Pacific Ocean.更多还原