DOI: 10.1007/s00382-012-1320-5
Scopus记录号: 2-s2.0-84866004814
论文题名: An investigation of tropical Atlantic bias in a high-resolution coupled regional climate model
作者: Patricola C.M. ; Li M. ; Xu Z. ; Chang P. ; Saravanan R. ; Hsieh J.-S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 39, 期: 2017-09-10 起始页码: 2443
结束页码: 2463
语种: 英语
英文摘要: Coupled atmosphere-ocean general circulation models (AOGCMs) commonly fail to simulate the eastern equatorial Atlantic boreal summer cold tongue and produce a westerly equatorial trade wind bias. This tropical Atlantic bias problem is investigated with a high-resolution (27-km atmosphere represented by the Weather Research and Forecasting Model, 9-km ocean represented by the Regional Ocean Modeling System) coupled regional climate model. Uncoupled atmospheric simulations test climate sensitivity to cumulus, land-surface, planetary boundary layer, microphysics, and radiation parameterizations and reveal that the radiation scheme has a pronounced impact in the tropical Atlantic. The CAM radiation simulates a dry precipitation (up to -90%) and cold land-surface temperature (up to -8 K) bias over the Amazon related to an over-representation of low-level clouds and almost basin-wide westerly trade wind bias. The Rapid Radiative Transfer Model and Goddard radiation simulates doubled Amazon and Congo Basin precipitation rates and a weak eastern Atlantic trade wind bias. Season-long high-resolution coupled regional model experiments indicate that the initiation of the warm eastern equatorial Atlantic sea surface temperature (SST) bias is more sensitive to the local rather than basin-wide trade wind bias and to a wet Congo Basin instead of dry Amazon-which differs from AOGCM simulations. Comparisons between coupled and uncoupled simulations suggest a regional Bjerknes feedback confined to the eastern equatorial Atlantic amplifies the initial SST, wind, and deepened thermocline bias, while barrier layer feedbacks are relatively unimportant. The SST bias in some CRCM simulations resembles the typical AOGCM bias indicating that increasing resolution is unlikely a simple solution to this problem. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55088
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Atmospheric Sciences, Texas AandM University, 3150 TAMU, College Station, TX 77843-3150, United States; Department of Oceanography, Texas AandM University, College Station, TX, United States; Key Laboratory of Physical Oceanography of Ministry of Education, Ocean University of China, Qingdao, China; State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Hangzhou, Zhejiang, China
Recommended Citation:
Patricola C.M.,Li M.,Xu Z.,et al. An investigation of tropical Atlantic bias in a high-resolution coupled regional climate model[J]. Climate Dynamics,2012-01-01,39(2017-09-10)