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    The Dynamics of Ascent-Forced Orographic Convection in the Tropics: Results from Dominica

    Source: Journal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 012::page 4067
    Author:
    Minder, Justin R.
    ,
    Smith, Ronald B.
    ,
    Nugent, Alison D.
    DOI: 10.1175/JAS-D-13-016.1
    Publisher: American Meteorological Society
    Abstract: he mountainous Caribbean island of Dominica was chosen as a natural laboratory for studying orographic convection in the tropics. Here, the authors focus on a prototypical case study, taken from the Dominica Experiment (DOMEX) field campaign in the spring of 2011. Airborne measurements and high-resolution numerical experiments are used to examine the mesoscale dynamics of moist airflow over Dominica and its relationship to convection, turbulence, and rainfall.Upwind of the island, there is minimal lateral deflection or lifting of the flow, largely because of latent heat release in the overisland convection. Over the terrain, forced ascent leads to rapid development of moist convection, buoyancy-generated turbulence, and rainfall. Although this convection produces sporadic bursts of heavy rainfall, it does not appear to enhance the time-mean rainfall. Over the lee slopes, a dry plunging flow produces anisotropic shear-generated turbulence and strong low-level winds while quickly dissipating convection and rainfall. In the wake, low-level air is decelerated, both by turbulence in the plunging flow and by frictional drag over the island. Low-level wake air is also dried and warmed, primarily by turbulent vertical mixing and regional descent, both associated with the downslope flow. Rainfall and latent heating play only a secondary role in warming and drying the wake.
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      The Dynamics of Ascent-Forced Orographic Convection in the Tropics: Results from Dominica

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4219260
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    contributor authorMinder, Justin R.
    contributor authorSmith, Ronald B.
    contributor authorNugent, Alison D.
    date accessioned2017-06-09T16:56:27Z
    date available2017-06-09T16:56:27Z
    date copyright2013/12/01
    date issued2013
    identifier issn0022-4928
    identifier otherams-76776.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219260
    description abstracthe mountainous Caribbean island of Dominica was chosen as a natural laboratory for studying orographic convection in the tropics. Here, the authors focus on a prototypical case study, taken from the Dominica Experiment (DOMEX) field campaign in the spring of 2011. Airborne measurements and high-resolution numerical experiments are used to examine the mesoscale dynamics of moist airflow over Dominica and its relationship to convection, turbulence, and rainfall.Upwind of the island, there is minimal lateral deflection or lifting of the flow, largely because of latent heat release in the overisland convection. Over the terrain, forced ascent leads to rapid development of moist convection, buoyancy-generated turbulence, and rainfall. Although this convection produces sporadic bursts of heavy rainfall, it does not appear to enhance the time-mean rainfall. Over the lee slopes, a dry plunging flow produces anisotropic shear-generated turbulence and strong low-level winds while quickly dissipating convection and rainfall. In the wake, low-level air is decelerated, both by turbulence in the plunging flow and by frictional drag over the island. Low-level wake air is also dried and warmed, primarily by turbulent vertical mixing and regional descent, both associated with the downslope flow. Rainfall and latent heating play only a secondary role in warming and drying the wake.
    publisherAmerican Meteorological Society
    titleThe Dynamics of Ascent-Forced Orographic Convection in the Tropics: Results from Dominica
    typeJournal Paper
    journal volume70
    journal issue12
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-13-016.1
    journal fristpage4067
    journal lastpage4088
    treeJournal of the Atmospheric Sciences:;2013:;Volume( 070 ):;issue: 012
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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