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    Understanding the Anthropogenically Forced Change of Equatorial Pacific Trade Winds in Coupled Climate Models

    Source: Journal of Climate:;2014:;volume( 027 ):;issue: 022::page 8510
    Author:
    Xiang, Baoqiang
    ,
    Wang, Bin
    ,
    Li, Juan
    ,
    Zhao, Ming
    ,
    Lee, June-Yi
    DOI: 10.1175/JCLI-D-14-00115.1
    Publisher: American Meteorological Society
    Abstract: nderstanding the change of equatorial Pacific trade winds is pivotal for understanding the global mean temperature change and the El Niño?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°S?5°N, 140°E?150°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°S?5°N, 150°?80°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.
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      Understanding the Anthropogenically Forced Change of Equatorial Pacific Trade Winds in Coupled Climate Models

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4223360
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    contributor authorXiang, Baoqiang
    contributor authorWang, Bin
    contributor authorLi, Juan
    contributor authorZhao, Ming
    contributor authorLee, June-Yi
    date accessioned2017-06-09T17:10:07Z
    date available2017-06-09T17:10:07Z
    date copyright2014/11/01
    date issued2014
    identifier issn0894-8755
    identifier otherams-80465.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223360
    description abstractnderstanding the change of equatorial Pacific trade winds is pivotal for understanding the global mean temperature change and the El Niño?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°S?5°N, 140°E?150°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°S?5°N, 150°?80°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.
    publisherAmerican Meteorological Society
    titleUnderstanding the Anthropogenically Forced Change of Equatorial Pacific Trade Winds in Coupled Climate Models
    typeJournal Paper
    journal volume27
    journal issue22
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-14-00115.1
    journal fristpage8510
    journal lastpage8526
    treeJournal of Climate:;2014:;volume( 027 ):;issue: 022
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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