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    Small-Scale Variability of the Raindrop Size Distribution and Its Effect on Areal Rainfall Retrieval

    Source: Journal of Hydrometeorology:;2016:;Volume( 017 ):;issue: 007::page 2077
    Author:
    Raupach, Timothy H.
    ,
    Berne, Alexis
    DOI: 10.1175/JHM-D-15-0214.1
    Publisher: American Meteorological Society
    Abstract: he drop size distribution (DSD) describes the microstructure of liquid precipitation. The high variability of the DSD reflects the variety of microphysical processes controlling raindrop properties and affects the retrieval of rainfall. An analysis of the effects of DSD subgrid variability on areal estimation of precipitation is presented. Data used were recorded with a network of disdrometers in Ardèche, France. DSD variability was studied over two typical scales: 5 km ? 5 km, similar to the ground footprint size of the Global Precipitation Measurement (GPM) spaceborne weather radar, and 2.8 km ? 2.8 km, an operational pixel size of the Consortium for Small-Scale Modeling (COSMO) numerical weather model. Stochastic simulation was used to generate high-resolution grids of DSD estimates over the regions of interest, constrained by experimental DSDs measured by disdrometers. From these grids, areal DSD estimates were derived. The error introduced by assuming a point measurement to be representative of the areal DSD was quantitatively characterized and was shown to increase with the size of the considered area and with drop size and to decrease with the integration time. The controlled framework allowed for the accuracy of retrieval algorithms to be investigated. Rainfall variables derived by idealized simulations of GPM- and COSMO-style algorithms were compared to subgrid distributions of the same variables. While rain rate and radar reflectivity were well represented, the estimated drop concentration and mass-weighted mean drop diameter were often less representative of subgrid values.
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      Small-Scale Variability of the Raindrop Size Distribution and Its Effect on Areal Rainfall Retrieval

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    contributor authorRaupach, Timothy H.
    contributor authorBerne, Alexis
    date accessioned2017-06-09T17:16:55Z
    date available2017-06-09T17:16:55Z
    date copyright2016/07/01
    date issued2016
    identifier issn1525-755X
    identifier otherams-82356.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4225461
    description abstracthe drop size distribution (DSD) describes the microstructure of liquid precipitation. The high variability of the DSD reflects the variety of microphysical processes controlling raindrop properties and affects the retrieval of rainfall. An analysis of the effects of DSD subgrid variability on areal estimation of precipitation is presented. Data used were recorded with a network of disdrometers in Ardèche, France. DSD variability was studied over two typical scales: 5 km ? 5 km, similar to the ground footprint size of the Global Precipitation Measurement (GPM) spaceborne weather radar, and 2.8 km ? 2.8 km, an operational pixel size of the Consortium for Small-Scale Modeling (COSMO) numerical weather model. Stochastic simulation was used to generate high-resolution grids of DSD estimates over the regions of interest, constrained by experimental DSDs measured by disdrometers. From these grids, areal DSD estimates were derived. The error introduced by assuming a point measurement to be representative of the areal DSD was quantitatively characterized and was shown to increase with the size of the considered area and with drop size and to decrease with the integration time. The controlled framework allowed for the accuracy of retrieval algorithms to be investigated. Rainfall variables derived by idealized simulations of GPM- and COSMO-style algorithms were compared to subgrid distributions of the same variables. While rain rate and radar reflectivity were well represented, the estimated drop concentration and mass-weighted mean drop diameter were often less representative of subgrid values.
    publisherAmerican Meteorological Society
    titleSmall-Scale Variability of the Raindrop Size Distribution and Its Effect on Areal Rainfall Retrieval
    typeJournal Paper
    journal volume17
    journal issue7
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/JHM-D-15-0214.1
    journal fristpage2077
    journal lastpage2104
    treeJournal of Hydrometeorology:;2016:;Volume( 017 ):;issue: 007
    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