青藏高原东侧地区夏季气温变化及其可能成因  

Variation of Summer Air Temperature on the East Side of Qinghai-Xizang Plateau and Its Probable Causes

作　　者：李跃清[1] 李崇银[2] 

机构地区：[1]中国气象局成都高原气象研究所,四川成都610072 [2]中国科学院大气物理研究所,北京100080

出　　处：《高原气象》2003年第B10期24-31,共8页Plateau Meteorology

基　　金：中国气象局成都高原气象研究所高原气象开放实验室基金;国家重点基础研究发展规划项目(G1998040900)第一部分;四川省科技厅重点科技项目(2000 03 21);"十五"四川省重点攻关项目(DING018 01);中国气象局"九五"青年气象科学基金资助

摘　　要：应用奇异值分解(SVD)和相关分析方法,研究了青藏高原东侧川渝地区气温变化及其原因。结果表明:夏季川渝地区气温与云量之间主要呈反位相关系,其第一模态代表了它们最主要的耦合特征;热带西太平洋海温偏暖(冷),引起副热带高压系统位置偏北(南),使川渝地区总云量偏少(多),造成川渝地区气温偏高(低)。最后建立了川渝地区夏季气温变化的概念模型,指出热带西太平洋海温异常变化,也是造成青藏高原东侧川渝地区气温变冷的主要原因之一。Using the Singular Value Decomposition (SVD) technique and correlation method, the variation of air temperature and its forming causes were investigated in Sichuan province and Chongqing city (SC) on the east side of QinghaiXizang Plateau. The result shows that the temperature and cloudiness in SC have mainly anticorrelation in summer. The first mode derived from SVD represent the key coupled features of the air temperature and cloudiness fields. The SST over tropical western Pacific are positive(negative) anomalies, the location of subtropical high system to the north(south), the cloudiness in SC decrease(increase), and resulting in the air temperature in SC are warmer (colder) anomalies. Finally, the conceptual model of variation of air temperature in summer was set up in SC. And it is pointed out that the anomalies of SST over tropical western Pacific is also one of the important reasons for the cooling of air temperature in SC on the east side of QinghaiXizang Plateau in summer.

关 键 词：青藏高原东侧 气温变化 成因分析 奇异值分解 

分 类 号：P423.3[天文地球—大气科学及气象学]