Monsoon Regimes and Processes in CCSM4. Part I: The Asian–Australian Monsoon
Monsoon Regimes and Processes in CCSM4. Part I: The Asian–Australian Monsoon
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DOI：
10.1175/jcli-d-11-00184.1
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发表时间：
2012-04
影响因子：
4.9
通讯作者：
G. Meehl;J. Arblaster;J. Caron;H. Annamalai;M. Jochum;A. Chakraborty;R. Murtugudde
中科院分区：
文献类型：
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作者：
G. Meehl;J. Arblaster;J. Caron;H. Annamalai;M. Jochum;A. Chakraborty;R. Murtugudde
亚洲-澳大利亚季风的模拟特征记录的共同体气候系统模式，版本4（CCSM 4）。这是第一部分的两部分系列研究季风制度在全球热带地区的CCSM4。比较大气模式相互比较项目（AMIP）模拟的大气成分在CCSM4社区大气模式，版本4，（CAM 4）]，以推断季风模拟运行与观测到的海表温度（SST）和海洋-大气耦合的差异。这些模拟还与先前版本的模型（CCSM 3）进行了比较，以评估进展。一般来说，季风降雨量太大，在非耦合AMIP运行与CAM4，和季风降雨量一般更好地模拟与海洋耦合CCSM4。与CCSM3相比，CCSM4对亚澳季风的模拟在很多方面都有所改进。南亚季风的热带印度洋降雨的系统误差减少，孟加拉湾的SST和区域南亚季风降水之间的模拟良好的连接。澳大利亚季风的降雨模式更接近观测结果，部分原因是CCSM4中印度尼西亚季风流和底辟扩散的改善。亚洲-澳大利亚季风的季节内变率在CCSM4中比CCSM3在向东和向北传播特征方面都有很大改善，但仍比观测到的要弱。CCSM4中对厄尔尼诺的模拟结果的改进，使得亚澳季风与厄尔尼诺-南方涛动（ENSO）之间的联系更加真实，尽管季风与ENSO之间的联系强度存在着相当大的年代际和世纪时间尺度的变化。
The simulation characteristics of the Asian-Australian monsoon are documented for the Community Climate System Model, version 4 (CCSM4). This is the first part of a two part series examining monsoon regimes in the global tropics in the CCSM4. Comparisons are made to an Atmospheric Model Intercomparison Project (AMIP) simulation of the atmospheric component in CCSM4 Community Atmosphere Model, version 4, (CAM4)] to deduce differences in the monsoon simulations run with observed sea surface temperatures (SSTs) and with ocean-atmosphere coupling. These simulations are also compared to a previous version of the model (CCSM3) to evaluate progress. In general, monsoon rainfall is too heavy in the uncoupled AMIP run with CAM4, and monsoon rainfall amounts are generally better simulated with ocean coupling in CCSM4. Most aspects of the Asian-Australian monsoon simulations are improved in CCSM4 compared to CCSM3. There is a reduction of the systematic error of rainfall over the tropical Indian Ocean for the South Asian monsoon, and well-simulated connections between SSTs in the Bay of Bengal and regional South Asian monsoon precipitation. The pattern of rainfall in the Australian monsoon is closer to observations in part because of contributions from the improvements of the Indonesian Throughflow and diapycnal diffusion in CCSM4. Intraseasonal variability of the Asian-Australian monsoon is much improved in CCSM4 compared to CCSM3 both in terms of eastward and northward propagation characteristics, though it is still somewhat weaker than observed. An improved simulation of El Nino in CCSM4 contributes to more realistic connections between the Asian-Australian monsoon and El Nino-Southern Oscillation (ENSO), though there is considerable decadal and century time scale variability of the strength of the monsoon-ENSO connection.