Connection between the South Pacific anticyclone , Peruvian stratocumulus , and the South American Monsoon System
Connection between the South Pacific anticyclone , Peruvian stratocumulus , and the South American Monsoon System
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南太平洋反气旋、秘鲁层积云和南美季风系统之间的联系
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
F. Sales
中科院分区：
文献类型：
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作者：
Ma;C. Mechoso;H. Xiao;C.;Y. Xue;F. Sales
我们研究了南太平洋副热带反气旋强度、秘鲁层积云和南美季风系统之间的联系。该方法是基于一个耦合的大气-海洋环流模式（GCM）的实验，在大气模式中的不同处理的陆面过程提供不同的代表性的对流在大陆。具体而言，大气模式是加州洛杉矶大学大气GCM（UCLA AGCM），其版本包括简单陆地方案（SLS）或简化的简单生物圈模式（SSiB），允许考虑土壤和植被生物物理过程。海洋GCM是马萨诸塞州理工学院海洋GCM（MIT OGCM）。这些陆面过程对季风气候学的影响表明，在SSIB版本中，亚马逊河流域中部的对流得到了改善，而在SLS版本中，对流太强了。南太平洋副热带反气旋减弱，其方式与罗德韦尔-霍斯金斯机制一致，即，通过SAMS对流以西的罗斯比波响应。秘鲁层积云的改善是由于沉降减弱和下垫面温度升高。关键词：大气环流模式，陆面过程，南太平洋反气旋，层积云
We examine the connection between the strength of the subtropical anti-cyclone in the South Pacific, Peruvian stratocumulus and the South American Monsoon System. The approach is based on experiments with a coupled atmosphere-ocean general circulation model (GCM) in which different treatment of land surface processes in the atmospheric model provide different representations of convection over the continents. Specifically the atmospheric model is the University of California Los Angeles Atmospheric GCM (UCLA AGCM) in versions with simple land scheme (SLS) or the Simplified Simple Biosphere Model (SSiB) that allows for consideration of soil and vegetation biophysical processes. The oceanic GCM is the Massachusetts Institute of Technology Oceanic GCM (MIT OGCM). The impact of these land surface processes on the monsoon climatology shows improved convection in central Amazonia in the SSiB version, which is too strong in the version with SLS. The subtropical anticyclone in the South Pacific weakens, in a way consistent with the Rodwell-Hoskins mechanism, i.e., through the Rossby wave response to the west of the SAMS convection. The Peruvian stratocumulus is improvement due to both weaker subsidence and warmer underlying sea surface temperature. Key word: GCM, land surface processes, South Pacific anti-cyclone, stratocumulus