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    Profiling Cloud Liquid Water by Combining Active and Passive Microwave Measurements with Cloud Model Statistics

    Source: Journal of Atmospheric and Oceanic Technology:;2001:;volume( 018 ):;issue: 008::page 1354
    Author:
    Löhnert, U.
    ,
    Crewell, S.
    ,
    Simmer, C.
    ,
    Macke, A.
    DOI: 10.1175/1520-0426(2001)018<1354:PCLWBC>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: A method for combining ground-based passive microwave radiometer retrievals of integrated liquid water (LWP), radar reflectivity profiles (Z), and statistics of a cloud model is proposed for deriving cloud liquid water profiles (LWC). A dynamic cloud model is used to determine Z?LWC relations and their errors as functions of height above cloud base. The cloud model is also used to develop an LWP algorithm based on simulations of brightness temperatures of a 20?30-GHz radiometer. For the retrieval of LWC, the radar determined Z profile, the passive microwave retrieved LWP, and a model climatology are combined by an inverse error covariance weighting method. Model studies indicate that LWC retrievals with this method result in rms errors that are about 10%?20% smaller in comparison to a conventional LWC algorithm, which constrains the LWC profile exactly to the measured LWP. According to the new algorithm, errors in the range of 30%?60% are to be anticipated when profiling LWC. The algorithm is applied to a time series measurement of a stratocumulus layer at GKSS in Geesthacht, Germany. The GKSS 95-GHz cloud radar, a 20?30-GHz microwave radiometer, and a laser ceilometer were collocated within a 5-m radius and operated continuously during the measurement period. The laser ceilometer was used to confirm the presence of drizzle-sized drops.
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      Profiling Cloud Liquid Water by Combining Active and Passive Microwave Measurements with Cloud Model Statistics

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4154989
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    • Journal of Atmospheric and Oceanic Technology

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    contributor authorLöhnert, U.
    contributor authorCrewell, S.
    contributor authorSimmer, C.
    contributor authorMacke, A.
    date accessioned2017-06-09T14:25:15Z
    date available2017-06-09T14:25:15Z
    date copyright2001/08/01
    date issued2001
    identifier issn0739-0572
    identifier otherams-1893.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4154989
    description abstractA method for combining ground-based passive microwave radiometer retrievals of integrated liquid water (LWP), radar reflectivity profiles (Z), and statistics of a cloud model is proposed for deriving cloud liquid water profiles (LWC). A dynamic cloud model is used to determine Z?LWC relations and their errors as functions of height above cloud base. The cloud model is also used to develop an LWP algorithm based on simulations of brightness temperatures of a 20?30-GHz radiometer. For the retrieval of LWC, the radar determined Z profile, the passive microwave retrieved LWP, and a model climatology are combined by an inverse error covariance weighting method. Model studies indicate that LWC retrievals with this method result in rms errors that are about 10%?20% smaller in comparison to a conventional LWC algorithm, which constrains the LWC profile exactly to the measured LWP. According to the new algorithm, errors in the range of 30%?60% are to be anticipated when profiling LWC. The algorithm is applied to a time series measurement of a stratocumulus layer at GKSS in Geesthacht, Germany. The GKSS 95-GHz cloud radar, a 20?30-GHz microwave radiometer, and a laser ceilometer were collocated within a 5-m radius and operated continuously during the measurement period. The laser ceilometer was used to confirm the presence of drizzle-sized drops.
    publisherAmerican Meteorological Society
    titleProfiling Cloud Liquid Water by Combining Active and Passive Microwave Measurements with Cloud Model Statistics
    typeJournal Paper
    journal volume18
    journal issue8
    journal titleJournal of Atmospheric and Oceanic Technology
    identifier doi10.1175/1520-0426(2001)018<1354:PCLWBC>2.0.CO;2
    journal fristpage1354
    journal lastpage1366
    treeJournal of Atmospheric and Oceanic Technology:;2001:;volume( 018 ):;issue: 008
    contenttypeFulltext
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    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian