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    Electrically Active Hot Towers in African Easterly Waves prior to Tropical Cyclogenesis

    Source: Monthly Weather Review:;2009:;volume( 138 ):;issue: 003::page 663
    Author:
    Leppert, Kenneth D.
    ,
    Petersen, Walter A.
    DOI: 10.1175/2009MWR3048.1
    Publisher: American Meteorological Society
    Abstract: It has been hypothesized that intense convective-scale ?hot? towers play a role in tropical cyclogenesis via dynamic and thermodynamic feedbacks on the larger-scale circulation. In this study the authors investigate the role that widespread and/or intense lightning-producing convection (i.e., electrically hot towers) present in African easterly waves (AEWs) may play in tropical cyclogenesis over the east Atlantic Ocean. The 700-hPa meridional wind from the NCEP?NCAR reanalysis dataset was analyzed to divide the waves into northerly, southerly, trough, and ridge phases. The AEWs were subsequently divided into waves that developed into tropical storms (i.e., developing) and those that did not develop into tropical storms (i.e., nondeveloping). Finally, composites were created using various NCEP variables, lightning data gathered with the Zeus network and worldwide lightning location network (WWLLN), and brightness temperature data extracted from the NASA global-merged infrared brightness temperature dataset. Results indicate that in all regions examined the developing waves seem to be associated with more widespread and/or intense lightning-producing convection. This increased convection associated with the developing waves might be related to the increased midlevel moisture, low-level vorticity, low-level convergence, upper-level divergence, and increased upward vertical motion found to be associated with the developing waves. In addition, the phasing of the convection with the AEWs as they move from East Africa to the central Atlantic shows some variability, which may have implications for tropical cyclogenesis.
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      Electrically Active Hot Towers in African Easterly Waves prior to Tropical Cyclogenesis

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4211323
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    contributor authorLeppert, Kenneth D.
    contributor authorPetersen, Walter A.
    date accessioned2017-06-09T16:32:22Z
    date available2017-06-09T16:32:22Z
    date copyright2010/03/01
    date issued2009
    identifier issn0027-0644
    identifier otherams-69632.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211323
    description abstractIt has been hypothesized that intense convective-scale ?hot? towers play a role in tropical cyclogenesis via dynamic and thermodynamic feedbacks on the larger-scale circulation. In this study the authors investigate the role that widespread and/or intense lightning-producing convection (i.e., electrically hot towers) present in African easterly waves (AEWs) may play in tropical cyclogenesis over the east Atlantic Ocean. The 700-hPa meridional wind from the NCEP?NCAR reanalysis dataset was analyzed to divide the waves into northerly, southerly, trough, and ridge phases. The AEWs were subsequently divided into waves that developed into tropical storms (i.e., developing) and those that did not develop into tropical storms (i.e., nondeveloping). Finally, composites were created using various NCEP variables, lightning data gathered with the Zeus network and worldwide lightning location network (WWLLN), and brightness temperature data extracted from the NASA global-merged infrared brightness temperature dataset. Results indicate that in all regions examined the developing waves seem to be associated with more widespread and/or intense lightning-producing convection. This increased convection associated with the developing waves might be related to the increased midlevel moisture, low-level vorticity, low-level convergence, upper-level divergence, and increased upward vertical motion found to be associated with the developing waves. In addition, the phasing of the convection with the AEWs as they move from East Africa to the central Atlantic shows some variability, which may have implications for tropical cyclogenesis.
    publisherAmerican Meteorological Society
    titleElectrically Active Hot Towers in African Easterly Waves prior to Tropical Cyclogenesis
    typeJournal Paper
    journal volume138
    journal issue3
    journal titleMonthly Weather Review
    identifier doi10.1175/2009MWR3048.1
    journal fristpage663
    journal lastpage687
    treeMonthly Weather Review:;2009:;volume( 138 ):;issue: 003
    contenttypeFulltext
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