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    Effects of Sea Spray on the Dynamics and Microphysics of an Idealized Tropical Cyclone

    Source: Journal of the Atmospheric Sciences:;2019:;volume 076:;issue 008::page 2213
    Author:
    Shpund, J.
    ,
    Khain, A.
    ,
    Rosenfeld, D.
    DOI: 10.1175/JAS-D-18-0270.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe effect of sea spray particles (SSP) on the intensity and microphysical structure of an idealized tropical cyclone (TC) is investigated using the Weather Research and Forecasting Model with a new spectral bin microphysics package. The SSP size distribution in the hurricane boundary layer is calculated using a Lagrangian?Eulerian bin-microphysics model (LEM) with high spatial resolution and extremely high drop size resolution. Sea spray ascending in updrafts within the eyewall of a TC dramatically increases the concentration of cloud drops within a wide range of sizes and decreases the effective drop radius to the values typical of polluted continental clouds. At the same time, the presence of spray drops of a few hundred microns in radii trigger intense rain just above cloud base. As a result, sea spray creates clouds that have a unique combination of maritime and continental properties. Outside the eyewall, clouds remain extremely maritime. SSP are shown to increase substantially the maximum vertical velocity, the cloud water content, and the mass contents of ice particles within the eyewall. As a result, SSP lead to TC intensification, axis symmetrization, and a decrease in eyewall radius. We found a new mechanism where wind-generated sea spray particles invigorate the inner cloud bands by nucleating more cloud droplets, which leads to more water vapor condensation and greater latent heating. The dependence of this process on surface wind speed constitutes a positive feedback loop that can lead to higher hurricane intensity. The results of simulations of cloud microstructure in the hurricane eyewall are supported by observations.
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      Effects of Sea Spray on the Dynamics and Microphysics of an Idealized Tropical Cyclone

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4263641
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    contributor authorShpund, J.
    contributor authorKhain, A.
    contributor authorRosenfeld, D.
    date accessioned2019-10-05T06:51:28Z
    date available2019-10-05T06:51:28Z
    date copyright3/21/2019 12:00:00 AM
    date issued2019
    identifier otherJAS-D-18-0270.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263641
    description abstractAbstractThe effect of sea spray particles (SSP) on the intensity and microphysical structure of an idealized tropical cyclone (TC) is investigated using the Weather Research and Forecasting Model with a new spectral bin microphysics package. The SSP size distribution in the hurricane boundary layer is calculated using a Lagrangian?Eulerian bin-microphysics model (LEM) with high spatial resolution and extremely high drop size resolution. Sea spray ascending in updrafts within the eyewall of a TC dramatically increases the concentration of cloud drops within a wide range of sizes and decreases the effective drop radius to the values typical of polluted continental clouds. At the same time, the presence of spray drops of a few hundred microns in radii trigger intense rain just above cloud base. As a result, sea spray creates clouds that have a unique combination of maritime and continental properties. Outside the eyewall, clouds remain extremely maritime. SSP are shown to increase substantially the maximum vertical velocity, the cloud water content, and the mass contents of ice particles within the eyewall. As a result, SSP lead to TC intensification, axis symmetrization, and a decrease in eyewall radius. We found a new mechanism where wind-generated sea spray particles invigorate the inner cloud bands by nucleating more cloud droplets, which leads to more water vapor condensation and greater latent heating. The dependence of this process on surface wind speed constitutes a positive feedback loop that can lead to higher hurricane intensity. The results of simulations of cloud microstructure in the hurricane eyewall are supported by observations.
    publisherAmerican Meteorological Society
    titleEffects of Sea Spray on the Dynamics and Microphysics of an Idealized Tropical Cyclone
    typeJournal Paper
    journal volume76
    journal issue8
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-18-0270.1
    journal fristpage2213
    journal lastpage2234
    treeJournal of the Atmospheric Sciences:;2019:;volume 076:;issue 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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