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    The Fall Speed Variability of Similarly Sized Ice Particle Aggregates

    Source: Journal of Applied Meteorology and Climatology:;2019:;volume 058:;issue 008::page 1751
    Author:
    Schmitt, Carl G.
    ,
    Sulia, Kara
    ,
    Lebo, Zachary J.
    ,
    Heymsfield, Andrew J.
    ,
    Przybyo, Vanessa
    ,
    Connolly, Paul
    DOI: 10.1175/JAMC-D-18-0291.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe terminal velocity (Vt) of ice hydrometeors is of high importance to atmospheric modeling. Vt is governed by the physical characteristics of a hydrometeor, including mass and projected area, as well as environmental conditions. When liquid hydrometeors coalesce to form larger hydrometeors, the resulting hydrometeor can readily be characterized by its spherical or near-spherical shape. For ice hydrometeors, it is more complicated because of the variability of ice shapes possible in the atmosphere as well as the inherent randomness in the aggregation process, which leads to highly variable characteristics. The abundance of atmospheric processes affecting ice particle dimensional characteristics creates potential for highly variable Vt for ice particles that are predicted or measured to be of the ?same size.? In this article we explore the variability of ice hydrometeor Vt both theoretically and through the use of experimental observations. Theoretically, the variability in Vt is investigated by analyzing the microphysical characteristics of randomly aggregated hexagonal shapes. The modeled dimensional characteristics are then compared to aircraft probe measurements to constrain the variability in atmospheric ice hydrometeor Vt. Results show that the spread in Vt can be represented with Gaussian distributions relative to a mean. Variability expressed as the full width at half maximum of the normalized Gaussian probability distribution function is around 20%, with somewhat higher values associated with larger particle sizes and warmer temperatures. Field campaigns where mostly convective clouds were sampled displayed low variability, while Arctic and midlatitude winter campaigns showed broader Vt spectra.
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      The Fall Speed Variability of Similarly Sized Ice Particle Aggregates

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4263564
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    contributor authorSchmitt, Carl G.
    contributor authorSulia, Kara
    contributor authorLebo, Zachary J.
    contributor authorHeymsfield, Andrew J.
    contributor authorPrzybyo, Vanessa
    contributor authorConnolly, Paul
    date accessioned2019-10-05T06:50:01Z
    date available2019-10-05T06:50:01Z
    date copyright6/18/2019 12:00:00 AM
    date issued2019
    identifier otherJAMC-D-18-0291.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263564
    description abstractAbstractThe terminal velocity (Vt) of ice hydrometeors is of high importance to atmospheric modeling. Vt is governed by the physical characteristics of a hydrometeor, including mass and projected area, as well as environmental conditions. When liquid hydrometeors coalesce to form larger hydrometeors, the resulting hydrometeor can readily be characterized by its spherical or near-spherical shape. For ice hydrometeors, it is more complicated because of the variability of ice shapes possible in the atmosphere as well as the inherent randomness in the aggregation process, which leads to highly variable characteristics. The abundance of atmospheric processes affecting ice particle dimensional characteristics creates potential for highly variable Vt for ice particles that are predicted or measured to be of the ?same size.? In this article we explore the variability of ice hydrometeor Vt both theoretically and through the use of experimental observations. Theoretically, the variability in Vt is investigated by analyzing the microphysical characteristics of randomly aggregated hexagonal shapes. The modeled dimensional characteristics are then compared to aircraft probe measurements to constrain the variability in atmospheric ice hydrometeor Vt. Results show that the spread in Vt can be represented with Gaussian distributions relative to a mean. Variability expressed as the full width at half maximum of the normalized Gaussian probability distribution function is around 20%, with somewhat higher values associated with larger particle sizes and warmer temperatures. Field campaigns where mostly convective clouds were sampled displayed low variability, while Arctic and midlatitude winter campaigns showed broader Vt spectra.
    publisherAmerican Meteorological Society
    titleThe Fall Speed Variability of Similarly Sized Ice Particle Aggregates
    typeJournal Paper
    journal volume58
    journal issue8
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-18-0291.1
    journal fristpage1751
    journal lastpage1761
    treeJournal of Applied Meteorology and Climatology:;2019:;volume 058:;issue 008
    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
    yabeshDSpacePersian