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    Impact of the Diurnal Radiation Cycle on Secondary Eyewall Formation

    Source: Journal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 009::page 3079
    Author:
    Tang, Xiaodong;Tan, Zhe-Min;Fang, Juan;Sun, Y. Qiang;Zhang, Fuqing
    DOI: 10.1175/JAS-D-17-0020.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe sensitivity of the secondary eyewall formation (SEF) of Hurricane Edouard (2014) to the diurnal solar insolation cycle is examined with convection-permitting simulations. A control run with a real diurnal radiation cycle and a sensitivity experiment without solar insolation are conducted. In the control run, there is an area of relatively weak convection between the outer rainbands and the primary eyewall, that is, a moat region. This area is highly sensitive to solar shortwave radiative heating, mostly in the mid- to upper levels in the daytime, which leads to a net stabilization effect and suppresses convective development. Moreover, the heated surface air weakens the wind-induced surface heat exchange (WISHE) feedback between the surface fluxes (that promote convection) and convective heating (that feeds into the secondary circulation and then the tangential wind). Consequently, a typical SEF with a clear moat follows. In the sensitivity experiment, in contrast, net radiative cooling leads to persistent active inner rainbands between the primary eyewall and outer rainbands, and these, along with the absence of the rapid filamentation zone, are detrimental to moat formation and thus to SEF. Sawyer?Eliassen diagnoses further suggest that the radiation-induced difference in diabatic heating is more important than the vortex wind structure for moat formation and SEF. These results suggest that the SEF is highly sensitive to solar insolation.
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      Impact of the Diurnal Radiation Cycle on Secondary Eyewall Formation

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4246486
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    contributor authorTang, Xiaodong;Tan, Zhe-Min;Fang, Juan;Sun, Y. Qiang;Zhang, Fuqing
    date accessioned2018-01-03T11:02:39Z
    date available2018-01-03T11:02:39Z
    date copyright7/25/2017 12:00:00 AM
    date issued2017
    identifier otherjas-d-17-0020.1.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4246486
    description abstractAbstractThe sensitivity of the secondary eyewall formation (SEF) of Hurricane Edouard (2014) to the diurnal solar insolation cycle is examined with convection-permitting simulations. A control run with a real diurnal radiation cycle and a sensitivity experiment without solar insolation are conducted. In the control run, there is an area of relatively weak convection between the outer rainbands and the primary eyewall, that is, a moat region. This area is highly sensitive to solar shortwave radiative heating, mostly in the mid- to upper levels in the daytime, which leads to a net stabilization effect and suppresses convective development. Moreover, the heated surface air weakens the wind-induced surface heat exchange (WISHE) feedback between the surface fluxes (that promote convection) and convective heating (that feeds into the secondary circulation and then the tangential wind). Consequently, a typical SEF with a clear moat follows. In the sensitivity experiment, in contrast, net radiative cooling leads to persistent active inner rainbands between the primary eyewall and outer rainbands, and these, along with the absence of the rapid filamentation zone, are detrimental to moat formation and thus to SEF. Sawyer?Eliassen diagnoses further suggest that the radiation-induced difference in diabatic heating is more important than the vortex wind structure for moat formation and SEF. These results suggest that the SEF is highly sensitive to solar insolation.
    publisherAmerican Meteorological Society
    titleImpact of the Diurnal Radiation Cycle on Secondary Eyewall Formation
    typeJournal Paper
    journal volume74
    journal issue9
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-17-0020.1
    journal fristpage3079
    journal lastpage3098
    treeJournal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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