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    Eastern Equatorial Pacific Forcing of ENSO Sea Surface Temperature Anomalies

    Source: Journal of Climate:;2008:;volume( 021 ):;issue: 022::page 6070
    Author:
    Zhang, Xuebin
    ,
    McPhaden, Michael J.
    DOI: 10.1175/2008JCLI2422.1
    Publisher: American Meteorological Society
    Abstract: Previous studies have described the impacts of wind stress variations in the eastern Pacific on sea surface temperature (SST) anomalies associated with the El Niño?Southern Oscillation (ENSO) phenomenon. However, these studies have usually focused on individual El Niño events and typically have not considered impacts on La Niña?the cold phase of the ENSO cycle. This paper examines effects of wind stress and heat flux forcing on interannual SST variations in the eastern equatorial Pacific from sensitivity tests using an ocean general circulation model over the period 1980?2002. Results indicate that in the Niño-3 region (5°N?5°S, 90°?150°W) a zonal wind stress anomaly of 0.01 N m?2 leads to about 1°C SST anomaly and that air?sea heat fluxes tend to damp interannual SST anomalies generated by other physical processes at a rate of about 40 W m?2 (°C)?1. These results systematically quantify expectations from previous event specific numerical model studies that local forcing in the eastern Pacific can significantly affect the evolution of both warm and cold phases of the ENSO cycle. The results are also consistent with a strictly empirical analysis that indicates that a wind stress anomaly of 0.01 N m?2 leads to ?1°C SST anomaly in the Niño-3 region.
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      Eastern Equatorial Pacific Forcing of ENSO Sea Surface Temperature Anomalies

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4208612
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    contributor authorZhang, Xuebin
    contributor authorMcPhaden, Michael J.
    date accessioned2017-06-09T16:24:04Z
    date available2017-06-09T16:24:04Z
    date copyright2008/11/01
    date issued2008
    identifier issn0894-8755
    identifier otherams-67192.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4208612
    description abstractPrevious studies have described the impacts of wind stress variations in the eastern Pacific on sea surface temperature (SST) anomalies associated with the El Niño?Southern Oscillation (ENSO) phenomenon. However, these studies have usually focused on individual El Niño events and typically have not considered impacts on La Niña?the cold phase of the ENSO cycle. This paper examines effects of wind stress and heat flux forcing on interannual SST variations in the eastern equatorial Pacific from sensitivity tests using an ocean general circulation model over the period 1980?2002. Results indicate that in the Niño-3 region (5°N?5°S, 90°?150°W) a zonal wind stress anomaly of 0.01 N m?2 leads to about 1°C SST anomaly and that air?sea heat fluxes tend to damp interannual SST anomalies generated by other physical processes at a rate of about 40 W m?2 (°C)?1. These results systematically quantify expectations from previous event specific numerical model studies that local forcing in the eastern Pacific can significantly affect the evolution of both warm and cold phases of the ENSO cycle. The results are also consistent with a strictly empirical analysis that indicates that a wind stress anomaly of 0.01 N m?2 leads to ?1°C SST anomaly in the Niño-3 region.
    publisherAmerican Meteorological Society
    titleEastern Equatorial Pacific Forcing of ENSO Sea Surface Temperature Anomalies
    typeJournal Paper
    journal volume21
    journal issue22
    journal titleJournal of Climate
    identifier doi10.1175/2008JCLI2422.1
    journal fristpage6070
    journal lastpage6079
    treeJournal of Climate:;2008:;volume( 021 ):;issue: 022
    contenttypeFulltext
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