Simulation of the QBO in IAP-AGCM:Analysis of momentum budget  

IAP-AGCM对QBO模拟的动量收支分析

作　　者：Zhaoyang Chai Minghua Zhang Qingcun Zeng Jinbo Xie Ting You He Zhang 

机构地区：[1]International Center for Climate and Environment Sciences,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China [2]College of Earth and Planetary Science,University of Chinese Academy of Sciences,Beijing,China [3]School of Marine and Atmospheric Sciences,State University of New York at Stony Brook,NY,USA [4]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China [5]Center for Monsoon System Research,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing,China

出　　处：《Atmospheric and Oceanic Science Letters》2021年第3期1-6,共6页大气和海洋科学快报（英文版）

基　　金：This research was supported by the National Major Research High Performance Computing Program of China[grant number 2016YFB0200800];the National Natural Science Foundation of China[grant numbers 41630530 and 41706036];the National Key Scientific and Technological Infrastructure project“Earth System Science Numerical Simulator Facility”(EarthLab).

摘　　要：The quasi-biennial oscillation(QBO),a dominant mode of the equatorial stratospheric(~100–1 hPa)variability,is known to impact tropospheric circulation in the middle and high latitudes.Yet,its realistic simulation in general circulation models remains a challenge.The authors examine the simulated QBO in the 69-layer version of the Institute of Atmospheric Physics Atmospheric General Circulation Model(IAP-AGCML69)and analyze its momentum budget.The authors find that the QBO is primarily caused by parameterized gravity-wave forcing due to tropospheric convection,but the downward propagation of the momentum source is significantly offset by the upward advection of zonal wind by the equatorial upwelling in the stratosphere.Resolved-scale waves act as a positive contribution to the total zonal wind tendency of the QBO over the equator with comparable magnitude to the gravity-wave forcing in the upper stratosphere.Results provide insights into the mechanism of the QBO and possible causes of differences in models.平流层准两年振荡(QBO)是赤道平流层(~100–1 hPa)变率的主要模态,可对中高纬地区的环流产生重要影响,但目前利用通用大气环流模式(GCM)对其进行准确模拟仍然是一个挑战.本文利用IAP大气环流模式(IAP-AGCM)的中高层大气模式版本(IAP-AGCML69)对QBO进行模拟,并对其动量收支情况进行分析.研究发现,QBO主要是由对流活动引起的重力波强迫(参数化)引起的,但该动量强迫被平流层赤道上升流所引起的平流过程显著削弱.模式可分辨尺度的波动强迫对赤道上空的QBO的总纬向风倾向有正贡献,在上平流层,其量值大小与参数化的重力波强迫相当.以上结果提供了对QBO形成机制以及模式模拟差异可能原因的认识.

关 键 词：QBO Gravity waves Momentum budget Zonal wind 

分 类 号：P434[天文地球—大气科学及气象学]