Improved simulation of the East Asian winter monsoon interannual variation by IAP/LASG AGCMs  

作　　者：JIN Chen-Xi ZHOU Tian-Jun GUO Zhun WU Bo CHEN Xiao-Long 

机构地区：[1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics,Chinese Academy of Sciences [2]College of Earth Science, University of Chinese Academy of Sciences [3]Climate Change Research Center, Chinese Academy of Sciences

出　　处：《Atmospheric and Oceanic Science Letters》2016年第3期204-210,共7页大气和海洋科学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China[grant numbers 41330423 and 41420104006]

摘　　要：The simulation of the East Asian winter monsoon （EAWM） has been a challenge for climate models. In this study, the performances of two versions of the AGCM developed at the lAP, versions 1 and 2 of the Grid-point Atmospheric Model of the IAP/LASG （GAMIL1 and GAMIL2）, are evaluated in the context of mean state and interannual variation. Significant improvements are shown for GAMIL2 in comparison to GAMIL1. The simulated interannual variability of the EAWM, measured by the regional average of 1000 hPa meridional wind over East Asia, has evidently improved; the correlation coefficient with reanalysis data changes from 0.37 in GAMIL1 to 0.71 in GAMIL2. The associated interannual precipitation anomalies are also improved, in terms of both spatial pattern and magnitude. Analysis demonstrates that the improvements result from the better simulation of the El Nino-related Philippine Sea anticyclone （PSAC） in GAMIL2. The improved moist processes, including the stratiform condensation and evaporation in GAMIL2, lead to a reasonable atmospheric heating associated with El Nitro in the tropical Pacific, which further drives the PSAC as a Rossby- wave response.东亚冬季风的模拟性能一直是检验气候模式的重要指标。本文对比分析了LASG新旧两个版本大气环流模式对东亚冬季风年际变率的模拟性能。结果表明,GAMIL2模拟的东亚冬季风指数与观测的相关系数为0.71,相较于GAMIL1(0.37)有明显改进。主要原因是GAMIL2改进了云参数化方案,能够更合理的再现加热率对厄尔尼诺的响应,有助于激发菲律宾海反气旋,从而改进东亚冬季风的模拟。

关 键 词：East Asian winter monsoon El Nino Grid-point Atmospheric Model of the IAP/LASG Philippine Seaanticyclone atmosphericheating 

分 类 号：P435[天文地球—大气科学及气象学] P425