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作 者:PU Ye TANG Yan-Li LI Li-Juan
机构地区:[1]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG),Institute of Atmospheric Physics,Chinese Academy of Sciences [2]College of Earth Science,University of Chinese Academy of Sciences
出 处:《Atmospheric and Oceanic Science Letters》2016年第5期337-342,共6页大气和海洋科学快报(英文版)
基 金:supported by the National Basic Research Program of China[973 Program,grant number 2015CB954102];the National Natural Sciences Foundation of China[grant number41205079];the China Postdoctoral Science Foundation[grant number 2016M591234]
摘 要:Satisfactory simulation of negative shortwave(SW) radiative feedback during ENSO in the equatorial Pacific remains a challenging issue for climate models. Previous studies have focused on specific physical processes in the atmospheric and/or oceanic model, but the coupling process in coupled models has not received much attention. To investigate the coupling effect on SW feedback, two versions of an AGCM and their corresponding coupled models are analyzed. Results indicate that the effects of the coupling process in the two versions lead to weakening and enhancement of the negative feedback in the earlier and new versions, respectively, mainly due to their different changes in cloud fraction feedback and dynamical feedback. Further examination of the nonlinearity of the feedback reveals that the opposite coupling effects in the two versions originate from their different responses to El Nio and to La Nia.气候模式对ENSO期间负的短波辐射反馈的模拟依然有挑战性,以往的研究主要侧重于大气或者海洋模式中具体物理过程的影响。为了探究耦合作用对其负反馈的效用,本研究分析对比了两个大气环流模式(GAMIL1和GAMIL2)以及相应的耦合模式(FGOALS-g1和FGOALS-g2)对ENSO的模拟,结果显示新旧两个版本的耦合作用对短波反馈的影响是不一样的,主要来源于云量反馈和动力学反馈的差异;通过对反馈的非线性过程的分析进一步揭示了新旧两个版本相反的耦合作用来自于它们对于厄尔尼诺和拉尼娜的不同相应。
关 键 词:Shortwave radiative feedback ENSO coupling effect GAMIL FGOALS-g
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