北太平洋海气系统主要模态的年代际变化  

Analysis of changes in decadal mode of North Pacific air-sea system

作　　者：张增平[1] 沈柏竹 李尚锋 龚志强[3] 封国林[1,3] 

机构地区：[1]扬州大学物理科学与技术学院,江苏扬州225002 [2]中高纬度环流系统与东亚季风研究开放实验室,长春130062 [3]中国气象局国家气候中心气候诊断预测室,北京100081

出　　处：《扬州大学学报（自然科学版）》2011年第4期31-37,共7页Journal of Yangzhou University：Natural Science Edition

基　　金：国家自然科学基金资助项目(41175083;40930952);国家支撑计划资助项目(2007BAC29B06);气象公益性行业专项资助项目(GYHY201006021)

摘　　要：结合北太平洋各种指数、海表温度和高度场,分析了北太平洋海气系统的突变特征及其与时间尺度分量的联系.研究结果表明:各种指数、海表温度和高度场在20世纪60年代、70年代和90年代末期均存在显著突变;海表温度60年代的突变主要分布于北太平洋北部,70年代的突变主要分布于北太平洋北部、中部和东南部,90年代突变则主要分布于北太平洋东南部和西南部;高度场突变主要分布于北太平洋北部、西北部和东南部,且突变范围从高层向低层递减.各种指数中60年代突变1～8a尺度分量的贡献较大,70年代突变是20～30a尺度分量的贡献较大,90年代的突变则是1～8a尺度和20～30a尺度分量作用相当.在3个突变时期中,海表温度和高度场的空间分布及相关性分析验证了这种联系的可能性.Abrupt change of North Pacific air-sea system（NPASS） and its correlations with temporal components of EOF are analyzed based on Pacific indices,sea surface temperature（SST） and height field.Research results show that 1960s,1970s and 1980s are three important abrupt change periods for NPASS,and abrupt changes are all existed in North Pacific indices,SST and height field.Abrupt change of SST mainly occurred in northern part of North Pacific during 1960s,in northern,middle and east northern parts during 1970s,in east and west northern parts during 1990s.Abrupt change of height field mainly occurred in northern,west northern and east southern parts,and abrupt change scope decreased from high to low level.In 1960s abrupt change of North Pacific indices was mainly contributed by the 1～8 a temporal components.In 1970s it was mainly contributed by the 20～30 a component,in 1990s mainly contributed by the 1～8 a and 20～30 a components.The analysis of SST and the spatial distribution of height field proves the probability of the connection mentioned above during 3 abrupt change scopes.

关 键 词：北太平洋 海气系统 时间尺度分量 

分 类 号：P401.2[天文地球—大气物理学与大气环境]