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    Sensitivity of CAM5-Simulated Arctic Clouds and Radiation to Ice Nucleation Parameterization

    Source: Journal of Climate:;2013:;volume( 026 ):;issue: 016::page 5981
    Author:
    Xie, Shaocheng
    ,
    Liu, Xiaohong
    ,
    Zhao, Chuanfeng
    ,
    Zhang, Yuying
    DOI: 10.1175/JCLI-D-12-00517.1
    Publisher: American Meteorological Society
    Abstract: ensitivity of Arctic clouds and radiation in the Community Atmospheric Model, version 5, to the ice nucleation process is examined by testing a new physically based ice nucleation scheme that links the variation of ice nuclei (IN) number concentration to aerosol properties. The default scheme parameterizes the IN concentration simply as a function of ice supersaturation. The new scheme leads to a significant reduction in simulated IN concentration at all latitudes while changes in cloud amounts and properties are mainly seen at high- and midlatitude storm tracks. In the Arctic, there is a considerable increase in midlevel clouds and a decrease in low-level clouds, which result from the complex interaction among the cloud macrophysics, microphysics, and large-scale environment. The smaller IN concentrations result in an increase in liquid water path and a decrease in ice water path caused by the slowdown of the Bergeron?Findeisen process in mixed-phase clouds. Overall, there is an increase in the optical depth of Arctic clouds, which leads to a stronger cloud radiative forcing (net cooling) at the top of the atmosphere. The comparison with satellite data shows that the new scheme slightly improves low-level cloud simulations over most of the Arctic but produces too many midlevel clouds. Considerable improvements are seen in the simulated low-level clouds and their properties when compared with Arctic ground-based measurements. Issues with the observations and the model?observation comparison in the Arctic region are discussed.
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      Sensitivity of CAM5-Simulated Arctic Clouds and Radiation to Ice Nucleation Parameterization

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4222489
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    contributor authorXie, Shaocheng
    contributor authorLiu, Xiaohong
    contributor authorZhao, Chuanfeng
    contributor authorZhang, Yuying
    date accessioned2017-06-09T17:07:14Z
    date available2017-06-09T17:07:14Z
    date copyright2013/08/01
    date issued2013
    identifier issn0894-8755
    identifier otherams-79682.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4222489
    description abstractensitivity of Arctic clouds and radiation in the Community Atmospheric Model, version 5, to the ice nucleation process is examined by testing a new physically based ice nucleation scheme that links the variation of ice nuclei (IN) number concentration to aerosol properties. The default scheme parameterizes the IN concentration simply as a function of ice supersaturation. The new scheme leads to a significant reduction in simulated IN concentration at all latitudes while changes in cloud amounts and properties are mainly seen at high- and midlatitude storm tracks. In the Arctic, there is a considerable increase in midlevel clouds and a decrease in low-level clouds, which result from the complex interaction among the cloud macrophysics, microphysics, and large-scale environment. The smaller IN concentrations result in an increase in liquid water path and a decrease in ice water path caused by the slowdown of the Bergeron?Findeisen process in mixed-phase clouds. Overall, there is an increase in the optical depth of Arctic clouds, which leads to a stronger cloud radiative forcing (net cooling) at the top of the atmosphere. The comparison with satellite data shows that the new scheme slightly improves low-level cloud simulations over most of the Arctic but produces too many midlevel clouds. Considerable improvements are seen in the simulated low-level clouds and their properties when compared with Arctic ground-based measurements. Issues with the observations and the model?observation comparison in the Arctic region are discussed.
    publisherAmerican Meteorological Society
    titleSensitivity of CAM5-Simulated Arctic Clouds and Radiation to Ice Nucleation Parameterization
    typeJournal Paper
    journal volume26
    journal issue16
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-12-00517.1
    journal fristpage5981
    journal lastpage5999
    treeJournal of Climate:;2013:;volume( 026 ):;issue: 016
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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