北太平洋环流振荡形成机理的数值研究  

Numerical Study on the Formation Mechanism of the North Pacific Gyre Oscillation

作　　者：吕庆平 张瑰 张东凌[3] 张胜军 LÜQing-ping;ZHANG Gui;ZHANG Dong-ling;ZHANG Sheng-jun(People′s Liberation Army 91001, Beijing 100143, China;Basic Department, Army Engineering University of PLA, Nanjing 211101, China;Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;People′s Liberation Army 92192, Ningbo 315122, China)

机构地区：[1]中国人民解放军91001部队,北京100143 [2]中国人民解放军陆军工程大学基础部,江苏南京211101 [3]中国科学院大气物理研究所,北京100029 [4]中国人民解放军92192部队,浙江宁波315122

出　　处：《海洋科学进展》2020年第4期582-590,共9页Advances in Marine Science

基　　金：国家重点研发计划项目——地球系统模式的改进、应用开发和高性能计算(2016YFB0200800)。

摘　　要：利用大洋环流模式,探讨海洋对大气强迫的响应及北太平洋环流振荡模态(NPGO)形成的直接原因。对控制试验模拟的海表温度异常(SSTA)进行经验正交函数(EOF)分解,发现第二模态类似于经典NPGO模态,说明采用该模式研究海洋对大气强迫的响应是可行的。在控制试验基础上,通过改变大气强迫场设计了一系列敏感试验,发现大气强迫场为NPGO模态正强年的合成场时,所得SST异常场能较好再现NPGO空间特征,说明海洋状态强烈依赖于大气强迫,大气强迫是造成NPGO的直接原因;对大气强迫场中的动力强迫、热力强迫等物理量进行不同配置进行试验,发现风场动力强迫对NPGO的影响最大,是形成NPGO的关键强迫,其中又以纬向风应力的影响居首。An oceanic general circulation model is adopted to study the oceanic response to atmospheric forcing and the formation mechanism of the North Pacific Gyre Oscillation(NPGO).The control experiment shows that the numerical model can successfully simulate the spatio-temporal features of the NPGO,suggesting that the model can be used to study the formation mechanism of the NPGO.The SST anomaly fields simulated by the model being forced with composed atmospheric fields of positive strong NPGO years are similar to the spatial pattern of the NPGO mode,suggesting that the atmospheric forcing is the direct mechanism of NPGO fromation.Sensitivity experiments reveal that the dynamic effect of wind is most important to the formation of NPGO,especially the effect of zonal wind stresses.

关 键 词：大洋环流模式 NPGO 大气强迫 海洋响应 

分 类 号：P732.6[天文地球—海洋科学]