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    Verification of a Mesoscale Data-Assimilation and Forecasting System for the Oklahoma City Area during the Joint Urban 2003 Field Project

    Source: Journal of Applied Meteorology and Climatology:;2006:;volume( 045 ):;issue: 007::page 912
    Author:
    Liu, Yubao
    ,
    Chen, Fei
    ,
    Warner, Thomas
    ,
    Basara, Jeffrey
    DOI: 10.1175/JAM2383.1
    Publisher: American Meteorological Society
    Abstract: The National Center for Atmospheric Research (NCAR) and the U.S. Army Test and Evaluation Command have developed a multiscale, rapid-cycling, real-time, four-dimensional data-assimilation and forecasting system that has been in operational use at five Army test ranges since 2001. This system was employed to provide operational modeling support for the Joint Urban 2003 (JU2003) Dispersion Experiment, conducted in Oklahoma City, Oklahoma, during July 2003. To better support this mission, modifications were made to the nonlocal boundary layer (BL) parameterization (known as the Medium Range Forecast scheme) of the fifth-generation Pennsylvania State University?NCAR Mesoscale Model, in order to improve BL forecasts. The NCEP?Oregon State University?Air Force?Hydrologic Research Laboratory land surface model was also improved to better represent urban forcing. Verification of the operational model runs and retrospectively simulated cases show 1) a significantly reduced low bias in the forecast surface wind speed and 2) more realistic daytime BL heights. During JU2003, the forecast urban heat island, urban dry bubble, and urban BL height agree reasonably well with observations and conceptual models. An analysis of three-dimensional atmospheric structures, based on model analyses for eight clear-sky days during the field program, reveals some interesting features of the Oklahoma City urban BL, including complex thermally induced circulations and associated convergence/divergence zones, a nocturnal thermal shadow downwind of the urban area, and the reduction of low-level jet wind speeds by more vigorous nocturnal mixing over the city.
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      Verification of a Mesoscale Data-Assimilation and Forecasting System for the Oklahoma City Area during the Joint Urban 2003 Field Project

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4216528
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    • Journal of Applied Meteorology and Climatology

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    contributor authorLiu, Yubao
    contributor authorChen, Fei
    contributor authorWarner, Thomas
    contributor authorBasara, Jeffrey
    date accessioned2017-06-09T16:47:56Z
    date available2017-06-09T16:47:56Z
    date copyright2006/07/01
    date issued2006
    identifier issn1558-8424
    identifier otherams-74316.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4216528
    description abstractThe National Center for Atmospheric Research (NCAR) and the U.S. Army Test and Evaluation Command have developed a multiscale, rapid-cycling, real-time, four-dimensional data-assimilation and forecasting system that has been in operational use at five Army test ranges since 2001. This system was employed to provide operational modeling support for the Joint Urban 2003 (JU2003) Dispersion Experiment, conducted in Oklahoma City, Oklahoma, during July 2003. To better support this mission, modifications were made to the nonlocal boundary layer (BL) parameterization (known as the Medium Range Forecast scheme) of the fifth-generation Pennsylvania State University?NCAR Mesoscale Model, in order to improve BL forecasts. The NCEP?Oregon State University?Air Force?Hydrologic Research Laboratory land surface model was also improved to better represent urban forcing. Verification of the operational model runs and retrospectively simulated cases show 1) a significantly reduced low bias in the forecast surface wind speed and 2) more realistic daytime BL heights. During JU2003, the forecast urban heat island, urban dry bubble, and urban BL height agree reasonably well with observations and conceptual models. An analysis of three-dimensional atmospheric structures, based on model analyses for eight clear-sky days during the field program, reveals some interesting features of the Oklahoma City urban BL, including complex thermally induced circulations and associated convergence/divergence zones, a nocturnal thermal shadow downwind of the urban area, and the reduction of low-level jet wind speeds by more vigorous nocturnal mixing over the city.
    publisherAmerican Meteorological Society
    titleVerification of a Mesoscale Data-Assimilation and Forecasting System for the Oklahoma City Area during the Joint Urban 2003 Field Project
    typeJournal Paper
    journal volume45
    journal issue7
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAM2383.1
    journal fristpage912
    journal lastpage929
    treeJournal of Applied Meteorology and Climatology:;2006:;volume( 045 ):;issue: 007
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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