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    Orographic Modification of Convection and Flow Kinematics by the Oregon Coast Range and Cascades during IMPROVE-2

    Source: Monthly Weather Review:;2008:;volume( 136 ):;issue: 010::page 3894
    Author:
    Colle, Brian A.
    ,
    Lin, Yanluan
    ,
    Medina, Socorro
    ,
    Smull, Bradley F.
    DOI: 10.1175/2008MWR2369.1
    Publisher: American Meteorological Society
    Abstract: This paper describes the kinematic and precipitation evolution accompanying the passage of a cold baroclinic trough over the Central Oregon Coast Range and Cascades during 4?5 December 2001 of the second Improvement of Microphysical Parameterization through Observational Verification Experiment (IMPROVE-2) field project. In contrast to previously documented IMPROVE-2 cases, the 4?5 December event featured weaker cross-barrier winds (15?20 m s?1), weaker moist static stability (Nm < 0.006 s?1), and convective cells that preferentially intensified over Oregon?s modest coastal mountain range. These cells propagated eastward and became embedded within the larger orographic precipitation shield over the windward slopes of the Cascades. The Weather Research and Forecasting Model (version 2.2) at 1.33-km grid spacing was able to accurately replicate the observed evolution of the precipitation across western Oregon. As a result of the convective cell development, the precipitation enhancement over the Coast Range (500?1000 m MSL) was nearly as large as that over the Cascades (1500?2000 m MSL). Simulations selectively eliminating the elevated coastal range and differential land?sea friction across the Pacific coastline illustrate that both effects were important in triggering convection and in producing the observed coastal precipitation enhancement. A sensitivity run employing a smoothed representation of the Cascades illustrates that narrow ridges located on that barrier?s windward slope had a relatively small (<5%) impact on embedded convection and overall precipitation amounts there. This is attributed to the relatively weak gravity wave motions and low freezing level, which limited precipitation growth by riming.
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      Orographic Modification of Convection and Flow Kinematics by the Oregon Coast Range and Cascades during IMPROVE-2

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4209305
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    contributor authorColle, Brian A.
    contributor authorLin, Yanluan
    contributor authorMedina, Socorro
    contributor authorSmull, Bradley F.
    date accessioned2017-06-09T16:26:04Z
    date available2017-06-09T16:26:04Z
    date copyright2008/10/01
    date issued2008
    identifier issn0027-0644
    identifier otherams-67816.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4209305
    description abstractThis paper describes the kinematic and precipitation evolution accompanying the passage of a cold baroclinic trough over the Central Oregon Coast Range and Cascades during 4?5 December 2001 of the second Improvement of Microphysical Parameterization through Observational Verification Experiment (IMPROVE-2) field project. In contrast to previously documented IMPROVE-2 cases, the 4?5 December event featured weaker cross-barrier winds (15?20 m s?1), weaker moist static stability (Nm < 0.006 s?1), and convective cells that preferentially intensified over Oregon?s modest coastal mountain range. These cells propagated eastward and became embedded within the larger orographic precipitation shield over the windward slopes of the Cascades. The Weather Research and Forecasting Model (version 2.2) at 1.33-km grid spacing was able to accurately replicate the observed evolution of the precipitation across western Oregon. As a result of the convective cell development, the precipitation enhancement over the Coast Range (500?1000 m MSL) was nearly as large as that over the Cascades (1500?2000 m MSL). Simulations selectively eliminating the elevated coastal range and differential land?sea friction across the Pacific coastline illustrate that both effects were important in triggering convection and in producing the observed coastal precipitation enhancement. A sensitivity run employing a smoothed representation of the Cascades illustrates that narrow ridges located on that barrier?s windward slope had a relatively small (<5%) impact on embedded convection and overall precipitation amounts there. This is attributed to the relatively weak gravity wave motions and low freezing level, which limited precipitation growth by riming.
    publisherAmerican Meteorological Society
    titleOrographic Modification of Convection and Flow Kinematics by the Oregon Coast Range and Cascades during IMPROVE-2
    typeJournal Paper
    journal volume136
    journal issue10
    journal titleMonthly Weather Review
    identifier doi10.1175/2008MWR2369.1
    journal fristpage3894
    journal lastpage3916
    treeMonthly Weather Review:;2008:;volume( 136 ):;issue: 010
    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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