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    The Relationship between Anvil Clouds and Convective Cells: A Case Study in South Florida during CRYSTAL-FACE

    Source: Monthly Weather Review:;2008:;volume( 136 ):;issue: 010::page 3917
    Author:
    Rickenbach, Thomas
    ,
    Kucera, Paul
    ,
    Gentry, Megan
    ,
    Carey, Larry
    ,
    Lare, Andrew
    ,
    Lin, Ruei-Fong
    ,
    Demoz, Belay
    ,
    Starr, David O’C.
    DOI: 10.1175/2008MWR2441.1
    Publisher: American Meteorological Society
    Abstract: One of the important goals of NASA?s Cirrus Regional Study of Tropical Anvils and Cirrus Layers?Florida Area Cirrus Experiment (CRYSTAL-FACE) was to further the understanding of the evolution of tropical anvil clouds generated by deep convective systems. An important step toward understanding the radiative properties of convectively generated anvil clouds is to study their life cycle. Observations from ground-based radar, geostationary satellite radiometers, aircraft, and radiosondes during CRYSTAL-FACE provided a comprehensive look at the generation of anvil clouds by convective systems over South Florida during July 2002. This study focused on the relationship between convective rainfall and the evolution of the anvil cloud shield associated with convective systems over South Florida on 23 July 2002, during the CRYSTAL-FACE experiment. Anvil clouds emanating from convective cells grew downwind (to the southwest), reaching their maximum area at all temperature thresholds 1?2 h after the active convective cells collapsed. Radar reflectivity data revealed that precipitation-sized anvil particles extended downwind with the cloud tops. The time lag between maximum rainfall and maximum anvil cloud area increased with system size and rainfall. Observations from airborne radar and analysis of in situ cloud particle size distribution measurements in the anvil region suggested that gravitational size sorting of cloud particles dispersed downshear was a likely mechanism in the evolution of the anvil region. Linear regression analysis suggested a positive trend between this time lag and maximum convective rainfall for this case, as well as between the time lag and maximum system cloud cover. The injection of condensate into the anvil region by large areas of intense cells and dispersal in the upper-level winds was a likely explanation to cause the anvil cloud-top area to grow for 1?2 h after the surface convective rainfall began to weaken. In future work these relationships should be evaluated in differing regimes of shear, stability, or precipitation efficiency, such as over the tropical oceans, in order to generalize the results. The results of this study implied that for these cloud systems, the maximum in latent heating (proportional to rainfall) may precede the peak radiative forcing (related to anvil cloud height and area) by a lead time that was proportional to system size and strength. Mesoscale modeling simulations of convective systems on this day are under way to examine anvil evolution and growth mechanisms.
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      The Relationship between Anvil Clouds and Convective Cells: A Case Study in South Florida during CRYSTAL-FACE

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4209343
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    contributor authorRickenbach, Thomas
    contributor authorKucera, Paul
    contributor authorGentry, Megan
    contributor authorCarey, Larry
    contributor authorLare, Andrew
    contributor authorLin, Ruei-Fong
    contributor authorDemoz, Belay
    contributor authorStarr, David O’C.
    date accessioned2017-06-09T16:26:11Z
    date available2017-06-09T16:26:11Z
    date copyright2008/10/01
    date issued2008
    identifier issn0027-0644
    identifier otherams-67851.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209343
    description abstractOne of the important goals of NASA?s Cirrus Regional Study of Tropical Anvils and Cirrus Layers?Florida Area Cirrus Experiment (CRYSTAL-FACE) was to further the understanding of the evolution of tropical anvil clouds generated by deep convective systems. An important step toward understanding the radiative properties of convectively generated anvil clouds is to study their life cycle. Observations from ground-based radar, geostationary satellite radiometers, aircraft, and radiosondes during CRYSTAL-FACE provided a comprehensive look at the generation of anvil clouds by convective systems over South Florida during July 2002. This study focused on the relationship between convective rainfall and the evolution of the anvil cloud shield associated with convective systems over South Florida on 23 July 2002, during the CRYSTAL-FACE experiment. Anvil clouds emanating from convective cells grew downwind (to the southwest), reaching their maximum area at all temperature thresholds 1?2 h after the active convective cells collapsed. Radar reflectivity data revealed that precipitation-sized anvil particles extended downwind with the cloud tops. The time lag between maximum rainfall and maximum anvil cloud area increased with system size and rainfall. Observations from airborne radar and analysis of in situ cloud particle size distribution measurements in the anvil region suggested that gravitational size sorting of cloud particles dispersed downshear was a likely mechanism in the evolution of the anvil region. Linear regression analysis suggested a positive trend between this time lag and maximum convective rainfall for this case, as well as between the time lag and maximum system cloud cover. The injection of condensate into the anvil region by large areas of intense cells and dispersal in the upper-level winds was a likely explanation to cause the anvil cloud-top area to grow for 1?2 h after the surface convective rainfall began to weaken. In future work these relationships should be evaluated in differing regimes of shear, stability, or precipitation efficiency, such as over the tropical oceans, in order to generalize the results. The results of this study implied that for these cloud systems, the maximum in latent heating (proportional to rainfall) may precede the peak radiative forcing (related to anvil cloud height and area) by a lead time that was proportional to system size and strength. Mesoscale modeling simulations of convective systems on this day are under way to examine anvil evolution and growth mechanisms.
    publisherAmerican Meteorological Society
    titleThe Relationship between Anvil Clouds and Convective Cells: A Case Study in South Florida during CRYSTAL-FACE
    typeJournal Paper
    journal volume136
    journal issue10
    journal titleMonthly Weather Review
    identifier doi10.1175/2008MWR2441.1
    journal fristpage3917
    journal lastpage3932
    treeMonthly Weather Review:;2008:;volume( 136 ):;issue: 010
    contenttypeFulltext
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