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    On the Angola Low Interannual Variability and Its Role in Modulating ENSO Effects in Southern Africa

    Source: Journal of Climate:;2019:;volume 032:;issue 015::page 4783
    Author:
    Pascale, Salvatore
    ,
    Pohl, Benjamin
    ,
    Kapnick, Sarah B.
    ,
    Zhang, Honghai
    DOI: 10.1175/JCLI-D-18-0745.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe Angola low is a summertime low pressure system that affects the convergence of low-level moisture fluxes into southern Africa. Interannual variations of the Angola low reduce the seasonal prediction skills for this region that arise from coupled atmosphere?ocean variability. Despite its importance, the interannual dynamics of the Angola low, and its relationship with El Niño?Southern Oscillation (ENSO) and other coupled modes of variability, are still poorly understood, mostly because of the scarcity of atmospheric data and short-term duration of atmospheric reanalyses in the region. To bypass this issue, we use a long-term (3500 year) run from a 50-km-resolution global coupled model capable of simulating the summertime southern African large-scale circulation and teleconnections. We find that the meridional displacement and strength of the Angola low are moderately modulated by local sea surface temperature anomalies, especially those in proximity of the southeastern African coast, and to a lesser extent by ENSO and the subtropical Indian Ocean dipole. Comparison of the coupled run with a 1000-yr run driven by climatological sea surface temperatures reveals that the interannual excursions of the Angola low are in both cases associated with geopotential height anomalies over the southern Atlantic and Indian Ocean related to extratropical atmospheric variability. Midlatitude atmospheric variability explains almost 60% of the variance of the Angola low variability in the uncoupled run, but only 20% in the coupled run. Therefore, while the Angola low appears to be intrinsically controlled by atmospheric extratropical variability, the interference of the atmospheric response forced by sea surface temperature anomalies weakens this influence.
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      On the Angola Low Interannual Variability and Its Role in Modulating ENSO Effects in Southern Africa

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    contributor authorPascale, Salvatore
    contributor authorPohl, Benjamin
    contributor authorKapnick, Sarah B.
    contributor authorZhang, Honghai
    date accessioned2019-10-05T06:43:08Z
    date available2019-10-05T06:43:08Z
    date copyright5/7/2019 12:00:00 AM
    date issued2019
    identifier otherJCLI-D-18-0745.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263205
    description abstractAbstractThe Angola low is a summertime low pressure system that affects the convergence of low-level moisture fluxes into southern Africa. Interannual variations of the Angola low reduce the seasonal prediction skills for this region that arise from coupled atmosphere?ocean variability. Despite its importance, the interannual dynamics of the Angola low, and its relationship with El Niño?Southern Oscillation (ENSO) and other coupled modes of variability, are still poorly understood, mostly because of the scarcity of atmospheric data and short-term duration of atmospheric reanalyses in the region. To bypass this issue, we use a long-term (3500 year) run from a 50-km-resolution global coupled model capable of simulating the summertime southern African large-scale circulation and teleconnections. We find that the meridional displacement and strength of the Angola low are moderately modulated by local sea surface temperature anomalies, especially those in proximity of the southeastern African coast, and to a lesser extent by ENSO and the subtropical Indian Ocean dipole. Comparison of the coupled run with a 1000-yr run driven by climatological sea surface temperatures reveals that the interannual excursions of the Angola low are in both cases associated with geopotential height anomalies over the southern Atlantic and Indian Ocean related to extratropical atmospheric variability. Midlatitude atmospheric variability explains almost 60% of the variance of the Angola low variability in the uncoupled run, but only 20% in the coupled run. Therefore, while the Angola low appears to be intrinsically controlled by atmospheric extratropical variability, the interference of the atmospheric response forced by sea surface temperature anomalies weakens this influence.
    publisherAmerican Meteorological Society
    titleOn the Angola Low Interannual Variability and Its Role in Modulating ENSO Effects in Southern Africa
    typeJournal Paper
    journal volume32
    journal issue15
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-18-0745.1
    journal fristpage4783
    journal lastpage4803
    treeJournal of Climate:;2019:;volume 032:;issue 015
    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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