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    Aircraft Measurements and Numerical Simulations of an Expansion Fan off the California Coast

    Source: Journal of Applied Meteorology and Climatology:;2016:;volume( 055 ):;issue: 009::page 2053
    Author:
    Parish, Thomas R.
    ,
    Rahn, David A.
    ,
    Leon, David C.
    DOI: 10.1175/JAMC-D-16-0101.1
    Publisher: American Meteorological Society
    Abstract: ountains along the California coastline play a critical role in the dynamics of marine atmospheric boundary layer (MBL) airflow in the vicinity of the shoreline. Large changes in the MBL topology have been known to occur downwind of points and capes along the western coast of the United States. Large spatial gradients in wind and temperature become established that can cause anomalous electromagnetic wave propagation. Detailed airborne measurements using the University of Wyoming King Air were conducted to study the adjustment of the MBL to the Point Arguello and Point Conception headlands. Pronounced thinning of the MBL consistent with an expansion fan occurred to the south of Point Conception on 13 June 2012. A sharp cloud edge was collocated with the near collapse of the MBL. D-value cross sections derived from differential GPS altitude measurements allow assessment of the vertical profile of the horizontal pressure gradient force and hence thermal wind forcing in response to the near collapse of the MBL. The Weather Research and Forecasting Model was run with a 1-km grid spacing to examine the atmospheric adjustment around Point Conception during this period. Results from the simulations including the vertical cross sections of the horizontal pressure gradient force were consistent with the aircraft observations. Model results suggest that divergence occurs as the flow rounds Point Conception, characteristic of an expansion fan. Wind speeds in the MBL increase coincident with the decrease in MBL thickness, and subsiding flow associated with the near collapse of the MBL is responsible for the sharp cloud edge.
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      Aircraft Measurements and Numerical Simulations of an Expansion Fan off the California Coast

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4217685
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    contributor authorParish, Thomas R.
    contributor authorRahn, David A.
    contributor authorLeon, David C.
    date accessioned2017-06-09T16:51:22Z
    date available2017-06-09T16:51:22Z
    date copyright2016/09/01
    date issued2016
    identifier issn1558-8424
    identifier otherams-75358.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4217685
    description abstractountains along the California coastline play a critical role in the dynamics of marine atmospheric boundary layer (MBL) airflow in the vicinity of the shoreline. Large changes in the MBL topology have been known to occur downwind of points and capes along the western coast of the United States. Large spatial gradients in wind and temperature become established that can cause anomalous electromagnetic wave propagation. Detailed airborne measurements using the University of Wyoming King Air were conducted to study the adjustment of the MBL to the Point Arguello and Point Conception headlands. Pronounced thinning of the MBL consistent with an expansion fan occurred to the south of Point Conception on 13 June 2012. A sharp cloud edge was collocated with the near collapse of the MBL. D-value cross sections derived from differential GPS altitude measurements allow assessment of the vertical profile of the horizontal pressure gradient force and hence thermal wind forcing in response to the near collapse of the MBL. The Weather Research and Forecasting Model was run with a 1-km grid spacing to examine the atmospheric adjustment around Point Conception during this period. Results from the simulations including the vertical cross sections of the horizontal pressure gradient force were consistent with the aircraft observations. Model results suggest that divergence occurs as the flow rounds Point Conception, characteristic of an expansion fan. Wind speeds in the MBL increase coincident with the decrease in MBL thickness, and subsiding flow associated with the near collapse of the MBL is responsible for the sharp cloud edge.
    publisherAmerican Meteorological Society
    titleAircraft Measurements and Numerical Simulations of an Expansion Fan off the California Coast
    typeJournal Paper
    journal volume55
    journal issue9
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-16-0101.1
    journal fristpage2053
    journal lastpage2062
    treeJournal of Applied Meteorology and Climatology:;2016:;volume( 055 ):;issue: 009
    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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