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    Examination of the μ–Λ Relation Suggested for Drop Size Distribution Parameters

    Source: Journal of Atmospheric and Oceanic Technology:;2007:;volume( 024 ):;issue: 005::page 847
    Author:
    Moisseev, Dmitri N.
    ,
    Chandrasekar, V.
    DOI: 10.1175/JTECH2010.1
    Publisher: American Meteorological Society
    Abstract: Raindrop size distributions are often assumed to follow a three-parameter gamma distribution. Since rain intensity retrieval from radar observations is an underdetermined problem, there is great interest in finding physical correlations between the parameters of the gamma distribution. One of the more common approaches is to measure naturally occurring drop size distributions (DSDs) using a disdrometer and to find DSD parameters by fitting a gamma distribution to these observations. Often the method of moments is used to retrieve the parameters of a gamma distribution from disdrometer observations. In this work the effect of the method of moments and data filtering on the relation between the parameters of the DSD is investigated, namely, the shape ? and the slope ? parameters. For this study the disdrometer observations were simulated. In these simulations the gamma distribution parameters Nw, D0, and ? were randomly selected from a wide range of values that are found in rainfall. Then, using simulated disdrometer measurements, DSD parameters were estimated using the method of moments. It is shown that the statistical errors associated with data filtering of disdrometer measurements might produce a spurious relation between ? and ? parameters. It is also shown that three independent disdrometer measurements can be used to verify the existence of such a relation.
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      Examination of the μ–Λ Relation Suggested for Drop Size Distribution Parameters

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4227725
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    contributor authorMoisseev, Dmitri N.
    contributor authorChandrasekar, V.
    date accessioned2017-06-09T17:23:33Z
    date available2017-06-09T17:23:33Z
    date copyright2007/05/01
    date issued2007
    identifier issn0739-0572
    identifier otherams-84394.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4227725
    description abstractRaindrop size distributions are often assumed to follow a three-parameter gamma distribution. Since rain intensity retrieval from radar observations is an underdetermined problem, there is great interest in finding physical correlations between the parameters of the gamma distribution. One of the more common approaches is to measure naturally occurring drop size distributions (DSDs) using a disdrometer and to find DSD parameters by fitting a gamma distribution to these observations. Often the method of moments is used to retrieve the parameters of a gamma distribution from disdrometer observations. In this work the effect of the method of moments and data filtering on the relation between the parameters of the DSD is investigated, namely, the shape ? and the slope ? parameters. For this study the disdrometer observations were simulated. In these simulations the gamma distribution parameters Nw, D0, and ? were randomly selected from a wide range of values that are found in rainfall. Then, using simulated disdrometer measurements, DSD parameters were estimated using the method of moments. It is shown that the statistical errors associated with data filtering of disdrometer measurements might produce a spurious relation between ? and ? parameters. It is also shown that three independent disdrometer measurements can be used to verify the existence of such a relation.
    publisherAmerican Meteorological Society
    titleExamination of the μ–Λ Relation Suggested for Drop Size Distribution Parameters
    typeJournal Paper
    journal volume24
    journal issue5
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/JTECH2010.1
    journal fristpage847
    journal lastpage855
    treeJournal of Atmospheric and Oceanic Technology:;2007:;volume( 024 ):;issue: 005
    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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