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    Regional Atmospheric Circulation and Rainfall Variability in South Equatorial Africa

    Source: Journal of Climate:;2014:;volume( 028 ):;issue: 002::page 809
    Author:
    Dezfuli, Amin K.
    ,
    Zaitchik, Benjamin F.
    ,
    Gnanadesikan, Anand
    DOI: 10.1175/JCLI-D-14-00333.1
    Publisher: American Meteorological Society
    Abstract: his study examines daily precipitation data during December?March over south equatorial Africa (SEA) and proposes a new zonal asymmetric pattern (ZAP) that explains the leading mode of weather-scale precipitation variability in the region. The eastern and western components of the ZAP, separated at about 30°E, appear to be a consequence of an anomalous zonal atmospheric cell triggered by enhanced low-level westerly winds. The enhanced westerlies are generated by a diagonal interhemispheric pressure gradient between the southwestern Indian and north tropical Atlantic Oceans. In eastern SEA these winds hit the East African Plateau, producing low-level convergence and convection that further intensifies the westerlies. In western SEA a subsiding branch develops in response, closing the circulation cell. The system gradually dissipates as the pressure gradient weakens. Through this mechanism, simultaneous changes in two hemispheres generate a regional zonally oriented circulation that relies on climatic communication between eastern and western equatorial Africa.
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      Regional Atmospheric Circulation and Rainfall Variability in South Equatorial Africa

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    contributor authorDezfuli, Amin K.
    contributor authorZaitchik, Benjamin F.
    contributor authorGnanadesikan, Anand
    date accessioned2017-06-09T17:10:37Z
    date available2017-06-09T17:10:37Z
    date copyright2015/01/01
    date issued2014
    identifier issn0894-8755
    identifier otherams-80608.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223519
    description abstracthis study examines daily precipitation data during December?March over south equatorial Africa (SEA) and proposes a new zonal asymmetric pattern (ZAP) that explains the leading mode of weather-scale precipitation variability in the region. The eastern and western components of the ZAP, separated at about 30°E, appear to be a consequence of an anomalous zonal atmospheric cell triggered by enhanced low-level westerly winds. The enhanced westerlies are generated by a diagonal interhemispheric pressure gradient between the southwestern Indian and north tropical Atlantic Oceans. In eastern SEA these winds hit the East African Plateau, producing low-level convergence and convection that further intensifies the westerlies. In western SEA a subsiding branch develops in response, closing the circulation cell. The system gradually dissipates as the pressure gradient weakens. Through this mechanism, simultaneous changes in two hemispheres generate a regional zonally oriented circulation that relies on climatic communication between eastern and western equatorial Africa.
    publisherAmerican Meteorological Society
    titleRegional Atmospheric Circulation and Rainfall Variability in South Equatorial Africa
    typeJournal Paper
    journal volume28
    journal issue2
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-14-00333.1
    journal fristpage809
    journal lastpage818
    treeJournal of Climate:;2014:;volume( 028 ):;issue: 002
    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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