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气象:2000,26(5):39-43
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西藏高原汛期降水类型的研究
(西藏自治区气象台,拉萨 850000)
Analysis of Rainfall Patterns during Rainy Season over the Tibetan Plateau
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中文摘要: 利用西藏高原26个测站26年(1973~1998年)汛期(5~9月)降水量资料,采用主成分分析和旋转主成分分析方法,对高原汛期降水空间分布型进行了分析。结果表明,主成分分解得到的降水空间分布形式较为集中,前3个特征向量场的分布型具有十分明确的物理意义,可表示降水场总方差的63.14%。旋转主成分分解后前6个载荷向量的累积方差贡献达76.67% ,可较好反映西藏高原汛期降水6个异常敏感区:东南部、东北部、那曲中西部、雅鲁藏布江谷地区、南部边缘地区和高原西北部。并逐年确定了高原汛期降水分布的类型。
Abstract:With Principal Component (PC) and Rotated Principal Component (RPC) analysis,the spatial anomaly characteristics of flood season rainfall over the Tibetan Plateau were studied by using 26 observational stations precipitation data of rainy season (from May to September) over the Tibetan Plateau from 1973 to 1998.Results show that the first three loading vector field could reflect the whole wet season anomaly structures of rainfall over the Plateau,for example,wet (dry) in all area pattern,wet (dry) in north and dry (wet) in south pattern,wet (dry) in west and dry (wet) in east pattern.The first six rotated loading vector field represent six principal anomaly regions:Southeast part,northeast part,midwest region of Naqu,Yalu Zangbu River basin,the margin zone of south Plateau and northwest part.
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基金项目:西藏自治区科委《西藏农区夏季旱涝规律及预报》资助,中国气象局《印度季风与西藏高原夏季降水》课题资助
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引用文本:
周顺武,普布卓玛,假拉,2000.西藏高原汛期降水类型的研究[J].气象,26(5):39-43.
,2000.Analysis of Rainfall Patterns during Rainy Season over the Tibetan Plateau[J].Meteor Mon,26(5):39-43.