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    Response of Surface Wind Divergence to Mesoscale SST Anomalies under Different Wind Conditions

    Source: Journal of the Atmospheric Sciences:;2019:;volume 076:;issue 007::page 2065
    Author:
    Foussard, A.
    ,
    Lapeyre, G.
    ,
    Plougonven, R.
    DOI: 10.1175/JAS-D-18-0204.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe response of the atmospheric boundary layer to mesoscale sea surface temperature (SST) is often characterized by a link between wind stress divergence and downwind SST gradients. In this study, an idealized simulation representative of a storm track above a prescribed stationary SST field is examined in order to determine in which background wind conditions that relationship occurs. The SST field is composed of a midlatitude large-scale frontal zone and mesoscale SST anomalies. It is shown that the divergence of the surface wind can correlate either with the Laplacian of the atmospheric boundary layer temperature or with the downwind SST gradient. The first case corresponds to background situations of weak winds or of unstable boundary layers, and the response is in agreement with an Ekman balance adjustment in the boundary layer. The second case corresponds to background situations of stable boundary layers, and the response is in agreement with downward mixing of momentum. Concerning the divergence of the wind stress, it generally resembles downwind SST gradients for stable and unstable boundary layers, in agreement with past studies. For weak winds, a correlation with the temperature Laplacian is, however, found to some extent. In conclusion, our study reveals the importance of the large-scale wind conditions in modulating the surface atmospheric response with different responses in the divergences of surface wind and wind stress.
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      Response of Surface Wind Divergence to Mesoscale SST Anomalies under Different Wind Conditions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4263617
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    contributor authorFoussard, A.
    contributor authorLapeyre, G.
    contributor authorPlougonven, R.
    date accessioned2019-10-05T06:51:00Z
    date available2019-10-05T06:51:00Z
    date copyright5/10/2019 12:00:00 AM
    date issued2019
    identifier otherJAS-D-18-0204.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263617
    description abstractAbstractThe response of the atmospheric boundary layer to mesoscale sea surface temperature (SST) is often characterized by a link between wind stress divergence and downwind SST gradients. In this study, an idealized simulation representative of a storm track above a prescribed stationary SST field is examined in order to determine in which background wind conditions that relationship occurs. The SST field is composed of a midlatitude large-scale frontal zone and mesoscale SST anomalies. It is shown that the divergence of the surface wind can correlate either with the Laplacian of the atmospheric boundary layer temperature or with the downwind SST gradient. The first case corresponds to background situations of weak winds or of unstable boundary layers, and the response is in agreement with an Ekman balance adjustment in the boundary layer. The second case corresponds to background situations of stable boundary layers, and the response is in agreement with downward mixing of momentum. Concerning the divergence of the wind stress, it generally resembles downwind SST gradients for stable and unstable boundary layers, in agreement with past studies. For weak winds, a correlation with the temperature Laplacian is, however, found to some extent. In conclusion, our study reveals the importance of the large-scale wind conditions in modulating the surface atmospheric response with different responses in the divergences of surface wind and wind stress.
    publisherAmerican Meteorological Society
    titleResponse of Surface Wind Divergence to Mesoscale SST Anomalies under Different Wind Conditions
    typeJournal Paper
    journal volume76
    journal issue7
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-18-0204.1
    journal fristpage2065
    journal lastpage2082
    treeJournal of the Atmospheric Sciences:;2019:;volume 076:;issue 007
    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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