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    A Modeling Case Study of Mixed-Phase Clouds over the Southern Ocean and Tasmania

    Source: Monthly Weather Review:;2009:;volume( 138 ):;issue: 003::page 839
    Author:
    Morrison, Anthony E.
    ,
    Siems, Steven T.
    ,
    Manton, Michael J.
    ,
    Nazarov, Alex
    DOI: 10.1175/2009MWR3011.1
    Publisher: American Meteorological Society
    Abstract: The cloud structure associated with two frontal passages over the Southern Ocean and Tasmania is investigated. The first event, during August 2006, is characterized by large quantities of supercooled liquid water and little ice. The second case, during October 2007, is more mixed phase. The Weather Research and Forecasting model (WRFV2.2.1) is evaluated using remote sensed and in situ observations within the post frontal air mass. The Thompson microphysics module is used to describe in-cloud processes, where ice is initiated using the Cooper parameterization at temperatures lower than ?8°C or at ice supersaturations greater than 8%. The evaluated cases are then used to numerically investigate the prevalence of supercooled and mixed-phase clouds over Tasmania and the ocean to the west. The simulations produce marine stratocumulus-like clouds with maximum heights of between 3 and 5 km. These are capped by weak temperature and strong moisture inversions. When the inversion is at temperatures warmer than ?10°C, WRF produces widespread supercooled cloud fields with little glaciation. This is consistent with the limited in situ observations. When the inversion is at higher altitudes, allowing cooler cloud tops, glaciated (and to a lesser extent mixed phase) clouds are more common. The simulations are further explored to evaluate any orographic signature within the cloud structure over Tasmania. No consistent signature is found between the two cases.
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      A Modeling Case Study of Mixed-Phase Clouds over the Southern Ocean and Tasmania

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4211301
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    contributor authorMorrison, Anthony E.
    contributor authorSiems, Steven T.
    contributor authorManton, Michael J.
    contributor authorNazarov, Alex
    date accessioned2017-06-09T16:32:18Z
    date available2017-06-09T16:32:18Z
    date copyright2010/03/01
    date issued2009
    identifier issn0027-0644
    identifier otherams-69612.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211301
    description abstractThe cloud structure associated with two frontal passages over the Southern Ocean and Tasmania is investigated. The first event, during August 2006, is characterized by large quantities of supercooled liquid water and little ice. The second case, during October 2007, is more mixed phase. The Weather Research and Forecasting model (WRFV2.2.1) is evaluated using remote sensed and in situ observations within the post frontal air mass. The Thompson microphysics module is used to describe in-cloud processes, where ice is initiated using the Cooper parameterization at temperatures lower than ?8°C or at ice supersaturations greater than 8%. The evaluated cases are then used to numerically investigate the prevalence of supercooled and mixed-phase clouds over Tasmania and the ocean to the west. The simulations produce marine stratocumulus-like clouds with maximum heights of between 3 and 5 km. These are capped by weak temperature and strong moisture inversions. When the inversion is at temperatures warmer than ?10°C, WRF produces widespread supercooled cloud fields with little glaciation. This is consistent with the limited in situ observations. When the inversion is at higher altitudes, allowing cooler cloud tops, glaciated (and to a lesser extent mixed phase) clouds are more common. The simulations are further explored to evaluate any orographic signature within the cloud structure over Tasmania. No consistent signature is found between the two cases.
    publisherAmerican Meteorological Society
    titleA Modeling Case Study of Mixed-Phase Clouds over the Southern Ocean and Tasmania
    typeJournal Paper
    journal volume138
    journal issue3
    journal titleMonthly Weather Review
    identifier doi10.1175/2009MWR3011.1
    journal fristpage839
    journal lastpage862
    treeMonthly Weather Review:;2009:;volume( 138 ):;issue: 003
    contenttypeFulltext
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