| 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。 |
| 关键词: 遥相关 夏季降水 太平洋海温 统计诊断 |
| DOI： |
| 分类号: |
| 基金项目:气象科学基金资助，9306号 |
附件 |
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| THE RELATION BETWEEN THE SUMMER PRECIPITATION ANOMALY IN SOUTHWESTERN CHINA AND THE SEASONAL SST VARIATION IN THE PACIFIC OCEAN |
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Tang Youmim1, Zhai Wuquan2, Xu Jinhong3
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1.Chengdu Institute of Meteorlogy,chengdu 610041;2.Meteorological Research Institute of Anhui Province,hefei 230061;3.Putian Weather Bureau,fujian Province,Putian 351100
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| Abstract: |
| By applying the data of sea surface temperature (SST) of Pacific Ocean (10°S - 50°N, 120°E - 80°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 function (EOF) to analyze the correlation between the summer precipitation in Southwestern China and the seasonal SST, clustering analysis to obtain two different precipitation patterns, and discusses the seasonal SST variation’s response 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 changed the nature of this correlation. Seasonal SST anomalies in the two kinds of precipitation patterns, which included anomaly and oscillation propagation were obviously different. E1 Nino event I, which began, with building up of heat west of the equatorial Eastern Pacific Ocean, affected precipitation pattern II , while El Nino event II , which began with building up over the equatorial Eastern Pacific Ocean, affected precipitation pattern I . The relation of the two the kinds of El Nino events to the two precipitation patterns were illustrated by the changes of subtropical high pressure which was caused by the differences of SST of the equatorial Eastern Pacific Ocean. |
| Key words: Correlation, Summer precipitation, SST of Pacific Ocean, Statistic diagnosis |
