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学科主题: Meteorology & Atmospheric Sciences
题名: Tropical Biases in CMIP5 Multimodel Ensemble: The Excessive Equatorial Pacific Cold Tongue and Double ITCZ Problems
作者: Li, G ; Xie, SP
通讯作者: ligen@scsio.ac.cn
关键词: Tropics ; Atmosphere-ocean interaction ; Precipitation ; Climatology ; General circulation models ; Model errors
刊名: JOURNAL OF CLIMATE
发表日期: 2014
卷: 27, 期:4, 页:1765-1780
收录类别: sci
部门归属: [Li, Gen] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China ; [Li, Gen ; Xie, Shang-Ping] Univ Hawaii Manoa, Int Pacific Res Ctr, Honolulu, HI 96822 USA ; [Li, Gen ; Xie, Shang-Ping] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA ; [Xie, Shang-Ping] Ocean Univ China, Phys Oceanog Lab, Qingdao, Shandong, Peoples R China
项目归属: LTO
资助者: National Basic Research Program of China [2012CB955603]; NSF [ATM-0854365]; NOAA
摘要: Errors of coupled general circulation models (CGCMs) limit their utility for climate prediction and projection. Origins of and feedback for tropical biases are investigated in the historical climate simulations of 18 CGCMs from phase 5 of the Coupled Model Intercomparison Project (CMIP5), together with the available Atmospheric Model Intercomparison Project (AMIP) simulations. Based on an intermodel empirical orthogonal function (EOF) analysis of tropical Pacific precipitation, the excessive equatorial Pacific cold tongue and double intertropical convergence zone (ITCZ) stand out as the most prominent errors of the current generation of CGCMs. The comparison of CMIP-AMIP pairs enables us to identify whether a given type of errors originates from atmospheric models. The equatorial Pacific cold tongue bias is associated with deficient precipitation and surface easterly wind biases in the western half of the basin in CGCMs, but these errors are absent in atmosphere-only models, indicating that the errors arise from the interaction with the ocean via Bjerknes feedback. For the double ITCZ problem, excessive precipitation south of the equator correlates well with excessive downward solar radiation in the Southern Hemisphere (SH) midlatitudes, an error traced back to atmospheric model simulations of cloud during austral spring and summer. This extratropical forcing of the ITCZ displacements is mediated by tropical ocean-atmosphere interaction and is consistent with recent studies of ocean-atmospheric energy transport balance.
原文出处: 查看原文
WOS记录号: WOS:000330816100024
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/10577
Appears in Collections:热带海洋环境国家重点实验室(LTO)_期刊论文

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Recommended Citation:
Li, G; Xie, SP.Tropical Biases in CMIP5 Multimodel Ensemble: The Excessive Equatorial Pacific Cold Tongue and Double ITCZ Problems,JOURNAL OF CLIMATE,2014,27(4):1765-1780
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