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    Relationships between South Atlantic SST Variability and Atmospheric Circulation over the South African Region during Austral Winter

    Source: Journal of Climate:;2005:;volume( 018 ):;issue: 016::page 3339
    Author:
    Reason, C. J. C.
    ,
    Jagadheesha, D.
    DOI: 10.1175/JCLI3474.1
    Publisher: American Meteorological Society
    Abstract: The Southwestern Cape (SWC) region of South Africa is characterized by winter rainfall brought mainly via cold fronts and by substantial interannual variability. Previous work has found evidence that the interannual variability in SWC winter rainfall may be related to sea surface temperature (SST) in the South Atlantic Ocean and to large-scale ocean?atmosphere interaction in this region. During wet winters, SST tends to be anomalously warm (cool) in the southwest Atlantic and southeast Atlantic (central South Atlantic). Atmospheric general circulation model experiments with various idealized SST anomalies in the South Atlantic are used to explore mechanisms potentially associated with the rainfall variability. The model results suggest that the atmosphere is sensitive to subtropical?midlatitude SST anomalies in the South Atlantic during winter. Locally, there are changes to the jet position and strength, low-level relative vorticity, and convergence of moisture and latent heat flux that lead to changes in rainfall over the SWC. The model response to the SST forcing also shows large-scale anomalies in the midlatitude Southern Hemisphere circulation, namely, an Antarctic Oscillation?type mode and wavenumber-3 changes, similar to those observed during anomalous winters in the region.
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      Relationships between South Atlantic SST Variability and Atmospheric Circulation over the South African Region during Austral Winter

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4220565
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    contributor authorReason, C. J. C.
    contributor authorJagadheesha, D.
    date accessioned2017-06-09T17:00:54Z
    date available2017-06-09T17:00:54Z
    date copyright2005/08/01
    date issued2005
    identifier issn0894-8755
    identifier otherams-77951.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220565
    description abstractThe Southwestern Cape (SWC) region of South Africa is characterized by winter rainfall brought mainly via cold fronts and by substantial interannual variability. Previous work has found evidence that the interannual variability in SWC winter rainfall may be related to sea surface temperature (SST) in the South Atlantic Ocean and to large-scale ocean?atmosphere interaction in this region. During wet winters, SST tends to be anomalously warm (cool) in the southwest Atlantic and southeast Atlantic (central South Atlantic). Atmospheric general circulation model experiments with various idealized SST anomalies in the South Atlantic are used to explore mechanisms potentially associated with the rainfall variability. The model results suggest that the atmosphere is sensitive to subtropical?midlatitude SST anomalies in the South Atlantic during winter. Locally, there are changes to the jet position and strength, low-level relative vorticity, and convergence of moisture and latent heat flux that lead to changes in rainfall over the SWC. The model response to the SST forcing also shows large-scale anomalies in the midlatitude Southern Hemisphere circulation, namely, an Antarctic Oscillation?type mode and wavenumber-3 changes, similar to those observed during anomalous winters in the region.
    publisherAmerican Meteorological Society
    titleRelationships between South Atlantic SST Variability and Atmospheric Circulation over the South African Region during Austral Winter
    typeJournal Paper
    journal volume18
    journal issue16
    journal titleJournal of Climate
    identifier doi10.1175/JCLI3474.1
    journal fristpage3339
    journal lastpage3355
    treeJournal of Climate:;2005:;volume( 018 ):;issue: 016
    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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