夏季西太副高脊面年际变化与太平洋海温关系的研究  

Relationship between the Interannual Variation of Western Pacific Subtropical High Ridge Surface in Summer and the Sea Surface Temperature of Pacific

作　　者：曹杰[1] 尤亚磊[1] 黄玮[1,2] 

机构地区：[1]云南大学大气科学系,云南昆明650091 [2]云南省气候中心,云南昆明650034

出　　处：《高原气象》2009年第2期411-418,共8页Plateau Meteorology

基　　金：国家自然科学基金项目(40475040,40875054)资助

摘　　要：利用谱分析、带通滤波、奇异值分解及合成分析等方法,以及欧洲中期数值天气预报中心大气环流再分析资料和美国NOAA的海温资料,研究了夏季西太平洋副热带高压(下称西太副高)脊面年际变化及其对前期太平洋海温响应的物理过程。结果表明,西太副高脊面存在准7.5年的最显著振荡周期。太平洋前冬和前春海温对夏季西太副高脊面的影响是显著的。其中El Ni～no型的异常海温分布将使夏季西太副高脊面偏南,而La Ni～na型的则使夏季西太副高脊面偏北。在对比分析与太平洋海温异常相联系的异常环流的基础上,发现异常海温强迫出的异常经向环流是有利于夏季西太副高脊面异常的一个重要原因。Some techniques, such as spectrum analysis, band-pass filtering, Singular Value Decomposition （SVD） and composite analysis, and the atmospheric and SST reanalysis data from ECMWF and NOAA, are used to study the interannual variation of Western Pacific Subtropical High Ridge Surface （WPSHRS） in summer and its response over the Pacific SST anomalies in precedent season. The results indicate that the most significant period of WPSHRS is about 7.5 a. The SSTa impact of precedent winter and spring on the WPSHRS is significant. The E1 Nino pattern generally results in the WPSHRS moving southward, while the La Nina pattern results in the opposite moving of WPSHRS. Based on the composite analysis, it is also found that meridional circulation caused by the Pacific SST anomalies plays an important role in the process of anomaly of WPSHRS.

关 键 词：西太副高脊面 年际变化 异常海温 经向环流 

分 类 号：P461[天文地球—大气科学及气象学]