大气高度场对春季印度洋海温一致型异常响应的数值模拟  

Numerical simulation on height response of unipole pattern to the Indian Ocean SSTA in spring

作　　者：彭道睿[1,2] 王丽琼[1] 左瑞亭[1] 于坤[1] 徐传书 

机构地区：[1]解放军理工大学气象学院 [2]解放军94592部队气象台

出　　处：《气象科学》2013年第3期273-281,共9页Journal of the Meteorological Sciences

基　　金：中科院大气物理研究所国际气候与环境科学中心开放课题

摘　　要：用60 a Hadley气候中心的月平均海温资料,用EOF分析重构了4月份印度洋海温的一致变化型异常,并以此驱动IAP9层大气环流模式,分别研究了海温异常初期适应阶段、异常当月和气候平均夏季3种时间尺度下大气高度场响应的传播和分布特征。研究发现,初期适应阶段,高度场响应的垂直传播约需4 d,且受控于整层无辐散约束;冷暖位相高度响应的水平传播路径差异较大,表现出明显的非对称性。海温异常当月,冷位相会激发出全球纬向Rossby波;而暖位相则激发出两半球洋面上2个大圆波列,且均有显著正压性。对气候平均夏季的北半球冷相位,高度响应表现为太平洋上空的3条异常纬带;对暖相位则表现为太平洋和大西洋上空的2个大圆波列。而南半球的高度场对冷位相响应主要表现为2波结构的绕极驻波,暖相位激发出环球的同心异常纬带。Based on EOF analysis on monthly mean SST data for 60 a from Hadley Climate Center, the unipole pattern of Indian Ocean SSTA was reconstructed, which drives IAP9L AGCM to investigate the propagation and distribution of the atmospheric height field during three periods including the initial adapting stage, the exact anomalous month and the climatic mean summer. The results show： during the initial adaption, the vertical propagation of height response approximately reguires 4 d and is restricted to non-divergence of the whole layer. The extending paths of height response present obvious horizohtal asymmetry and show distinct difference between the cold and the warm phase. During the exact anomalous month, the global zonal Rossby waves are inspired by cold phase while two wavelets are aroused by warm phase over the Pacific Ocean in two hemispheres; both of the two phases show remarkable barotropy. For climatic summer in north hemisphere, three anomalous height zones are presented over Pacific Ocean for cold phase, while two wavelets are produced over both Pacific Ocean and Atlantic Ocean for warm case. In southern hemisphere, double peak＇s stationary polar waves are arosed for cold phase, while global circled anomalous zones are presented for warm case.

关 键 词：海温异常 数值模拟 高度场响应 

分 类 号：P434.4[天文地球—大气科学及气象学]