Monsoon Regimes in the CCSM3

Simulations of regional monsoon regimes, including the Indian, Australian, West African, South American, and North American monsoons, are described for the T85 version of the Community Climate System Model version 3 (CCSM3) and compared to observations and Atmospheric Model Intercomparison Project (...

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Bibliographic Details
Published in:Journal of climate 2006-06, Vol.19 (11), p.2482-2495
Main Authors: Meehl, Gerald A., Arblaster, Julie M., Lawrence, David M., Seth, Anji, Schneider, Edwin K., Kirtman, Ben P., Min, Dughong
Format: Article
Language:English
Subjects:
Atmospheric models
Climate
Climate models
Climate system
Global climate models
Modeling
Monsoons
Oceans
Precipitation
Rain
Rainy seasons
Simulation
Simulations
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Summary:Simulations of regional monsoon regimes, including the Indian, Australian, West African, South American, and North American monsoons, are described for the T85 version of the Community Climate System Model version 3 (CCSM3) and compared to observations and Atmospheric Model Intercomparison Project (AMIP)-type SST-forced simulations with the Community Atmospheric Model version 3 (CAM3) at T42 and T85. There are notable improvements in the regional aspects of the precipitation simulations in going to the higher-resolution T85 compared to T42 where topography is important (e.g., Ethiopian Highlands, South American Andes, and Tibetan Plateau). For the T85 coupled version of CCSM3, systematic SST errors are associated with regional precipitation errors in the monsoon regimes of South America and West Africa, though some aspects of the monsoon simulations, particularly in Asia, improve in the coupled model compared to the SST-forced simulations. There is very little realistic intraseasonal monsoon variability in the CCSM3 consistent with earlier versions of the model. Teleconnections to the tropical Pacific are well simulated for the South Asian monsoon.
ISSN:0894-8755
1520-0442
DOI:10.1175/JCLI3745.1