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DOI10.1175/JCLI-D-14-00115.1
Understanding the Anthropogenically Forced Change of Equatorial Pacific Trade Winds in Coupled Climate Models
Xiang, Baoqiang1,2,3; Wang, Bin3,4,5; Li, Juan3; Zhao, Ming1,2; Lee, June-Yi6
通讯作者Xiang, Baoqiang
来源期刊JOURNAL OF CLIMATE
ISSN0894-8755
EISSN1520-0442
出版年2014
卷号27期号:22页码:8510-8526
英文摘要

Understanding the change of equatorial Pacific trade winds is pivotal for understanding the global mean temperature change and the El Nino-Southern Oscillation (ENSO) property change. The weakening of the Walker circulation due to anthropogenic greenhouse gas (GHG) forcing was suggested as one of the most robust phenomena in current climate models by examining zonal sea level pressure gradient over the tropical Pacific. This study explores another component of the Walker circulation change focusing on equatorial Pacific trade wind change. Model sensitivity experiments demonstrate that the direct/fast response due to GHG forcing is to increase the trade winds, especially over the equatorial central-western Pacific (ECWP) (5 degrees S-5 degrees N, 140 degrees E-150 degrees W), while the indirect/slow response associated with sea surface temperature (SST) warming weakens the trade winds.Further, analysis of the results from 19 models in phase 5 of the Coupled Model Intercomparison Project (CMIP5) and the Parallel Ocean Program (POP)-Ocean Atmosphere Sea Ice Soil (OASIS)-ECHAM model (POEM) shows that the projected weakening of the trades is robust only in the equatorial eastern Pacific (EEP) ( 5 degrees S-5 degrees N, 150 degrees-80 degrees W), but highly uncertain over the ECWP with 9 out of 19 CMIP5 models producing intensified trades. The prominent and robust weakening of EEP trades is suggested to be mainly driven by a top-down mechanism: the mean vertical advection of more upper-tropospheric warming downward to generate a cyclonic circulation anomaly in the southeast tropical Pacific. In the ECWP, the large intermodel spread is primarily linked to model diversity in simulating the relative warming of the equatorial Pacific versus the tropical mean sea surface temperature. The possible root causes of the uncertainty for the trade wind change are also discussed.


英文关键词Atmosphere-ocean interaction Atmospheric circulation Climate models Numerical analysis modeling Climate variability Tropical variability
类型Article
语种英语
国家USA ; Peoples R China ; South Korea
收录类别SCI-E
WOS记录号WOS:000344774200014
WOS关键词WALKER CIRCULATION ; TEMPERATURE TRENDS ; REGIONAL PATTERNS ; TROPICAL PACIFIC ; LATE 1990S ; CO2 ; PRECIPITATION ; VARIABILITY ; PERSPECTIVE ; MECHANISMS
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
来源机构南京信息工程大学
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/183191
作者单位1.NOAA, Geophys Fluid Dynam Lab, Princeton, NJ 08540 USA;
2.Univ Corp Atmospheric Res, Boulder, CO USA;
3.Univ Hawaii Manoa, Int Pacific Res Ctr, Honolulu, HI 96822 USA;
4.NOAA, Dept Meteorol, Princeton, NJ 08540 USA;
5.Nanjing Univ Informat Sci & Technol, Earth Syst Modeling Ctr, NIAMS, Nanjing, Jiangsu, Peoples R China;
6.Pusan Natl Univ, Inst Environm Studies, Pusan, South Korea
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Xiang, Baoqiang,Wang, Bin,Li, Juan,et al. Understanding the Anthropogenically Forced Change of Equatorial Pacific Trade Winds in Coupled Climate Models[J]. 南京信息工程大学,2014,27(22):8510-8526.
APA Xiang, Baoqiang,Wang, Bin,Li, Juan,Zhao, Ming,&Lee, June-Yi.(2014).Understanding the Anthropogenically Forced Change of Equatorial Pacific Trade Winds in Coupled Climate Models.JOURNAL OF CLIMATE,27(22),8510-8526.
MLA Xiang, Baoqiang,et al."Understanding the Anthropogenically Forced Change of Equatorial Pacific Trade Winds in Coupled Climate Models".JOURNAL OF CLIMATE 27.22(2014):8510-8526.
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