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    A Physically Based Algorithm for Downscaling Temperature in Complex Terrain

    Source: Journal of Applied Meteorology and Climatology:;2018:;volume 057:;issue 008::page 1907
    Author:
    Sheridan, Peter
    ,
    Vosper, Simon
    ,
    Smith, Samantha
    DOI: 10.1175/JAMC-D-17-0140.1
    Publisher: American Meteorological Society
    Abstract: AbstractRecent improvements to an algorithm to be used operationally for downscaling screen temperatures from numerical weather prediction models are described. Testing against very high resolution dynamically downscaled screen temperatures and intensive field measurements taken during the Cold-Air Pooling Experiment (COLPEX) is performed. The improvements are based on a physical understanding of the processes involved in the formation of cold-air pools (CAPs) that is informed by recent research. The algorithm includes a parameterization of sidewall sheltering effects that lead to lower temperatures in valley-bottom CAPs on clear, calm nights. Advection and adjustment over exposed hilltops results in higher screen temperatures than on flat ground but lower temperatures relative to the free air above the valley at the same elevation, and a treatment of this effect has also been developed. These processes form the major contributions to the often dramatic small-scale variations in temperature in complex terrain in stable boundary layer conditions, even when height variation is fairly shallow. The improvements result in qualitatively better reproduction of subgrid temperature patterns in complex terrain during CAPs. Statistical forecast errors are subsequently improved.
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      A Physically Based Algorithm for Downscaling Temperature in Complex Terrain

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4261591
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    • Journal of Applied Meteorology and Climatology

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    contributor authorSheridan, Peter
    contributor authorVosper, Simon
    contributor authorSmith, Samantha
    date accessioned2019-09-19T10:06:22Z
    date available2019-09-19T10:06:22Z
    date copyright5/23/2018 12:00:00 AM
    date issued2018
    identifier otherjamc-d-17-0140.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4261591
    description abstractAbstractRecent improvements to an algorithm to be used operationally for downscaling screen temperatures from numerical weather prediction models are described. Testing against very high resolution dynamically downscaled screen temperatures and intensive field measurements taken during the Cold-Air Pooling Experiment (COLPEX) is performed. The improvements are based on a physical understanding of the processes involved in the formation of cold-air pools (CAPs) that is informed by recent research. The algorithm includes a parameterization of sidewall sheltering effects that lead to lower temperatures in valley-bottom CAPs on clear, calm nights. Advection and adjustment over exposed hilltops results in higher screen temperatures than on flat ground but lower temperatures relative to the free air above the valley at the same elevation, and a treatment of this effect has also been developed. These processes form the major contributions to the often dramatic small-scale variations in temperature in complex terrain in stable boundary layer conditions, even when height variation is fairly shallow. The improvements result in qualitatively better reproduction of subgrid temperature patterns in complex terrain during CAPs. Statistical forecast errors are subsequently improved.
    publisherAmerican Meteorological Society
    titleA Physically Based Algorithm for Downscaling Temperature in Complex Terrain
    typeJournal Paper
    journal volume57
    journal issue8
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-17-0140.1
    journal fristpage1907
    journal lastpage1929
    treeJournal of Applied Meteorology and Climatology:;2018:;volume 057:;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