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    A Study of Nocturnal Surface Wind Speed Overprediction by the WRF-ARW Model in Southeastern Texas

    Source: Journal of Applied Meteorology and Climatology:;2013:;volume( 052 ):;issue: 012::page 2638
    Author:
    Ngan, Fong
    ,
    Kim, Hyuncheol
    ,
    Lee, Pius
    ,
    Al-Wali, Khalid
    ,
    Dornblaser, Bright
    DOI: 10.1175/JAMC-D-13-060.1
    Publisher: American Meteorological Society
    Abstract: he overprediction of surface wind speed during nighttime by the Advanced Research core of the Weather Research and Forecasting (WRF-ARW) model was investigated for a period of the Second Texas Air Quality Study (28 May?3 July 2006). In coastal regions of southeastern Texas, the model had a significant increase of wind speed biases on the surface in the evening throughout the period, especially between 4 and 12 June. The synoptic pattern was a high pressure system centered over the Louisiana?Mississippi area that was subjected to a weak easterly?southeasterly flow in the lower troposphere. The weather conditions favorable for sea-breeze development brought a southerly?southwesterly onshore flow to the near-surface levels. In comparison with measurements, the downward sensible heat flux was overpredicted at night, which resulted in a warm bias in surface temperature. For the vertical wind profile on days with an evening wind bias, sea-breeze-driven nocturnal low-level jets (southerly?southwesterly) were present at around 300 m while another wind maximum was observed at higher levels (around 1.5?2 km), which were associated with a high pressure system centered on southeastern states. The vertical gradient of wind speed in the lowest 150 m was smoother in the model than it was in the observations; this could be attributed to excessive downward mixing. Sensitivities using different land surface and PBL parameterizations showed that the model's overprediction of nocturnal wind was still present despite improvements in the predictions of surface temperature and sensible heat flux.
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      A Study of Nocturnal Surface Wind Speed Overprediction by the WRF-ARW Model in Southeastern Texas

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4217280
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    contributor authorNgan, Fong
    contributor authorKim, Hyuncheol
    contributor authorLee, Pius
    contributor authorAl-Wali, Khalid
    contributor authorDornblaser, Bright
    date accessioned2017-06-09T16:50:07Z
    date available2017-06-09T16:50:07Z
    date copyright2013/12/01
    date issued2013
    identifier issn1558-8424
    identifier otherams-74994.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4217280
    description abstracthe overprediction of surface wind speed during nighttime by the Advanced Research core of the Weather Research and Forecasting (WRF-ARW) model was investigated for a period of the Second Texas Air Quality Study (28 May?3 July 2006). In coastal regions of southeastern Texas, the model had a significant increase of wind speed biases on the surface in the evening throughout the period, especially between 4 and 12 June. The synoptic pattern was a high pressure system centered over the Louisiana?Mississippi area that was subjected to a weak easterly?southeasterly flow in the lower troposphere. The weather conditions favorable for sea-breeze development brought a southerly?southwesterly onshore flow to the near-surface levels. In comparison with measurements, the downward sensible heat flux was overpredicted at night, which resulted in a warm bias in surface temperature. For the vertical wind profile on days with an evening wind bias, sea-breeze-driven nocturnal low-level jets (southerly?southwesterly) were present at around 300 m while another wind maximum was observed at higher levels (around 1.5?2 km), which were associated with a high pressure system centered on southeastern states. The vertical gradient of wind speed in the lowest 150 m was smoother in the model than it was in the observations; this could be attributed to excessive downward mixing. Sensitivities using different land surface and PBL parameterizations showed that the model's overprediction of nocturnal wind was still present despite improvements in the predictions of surface temperature and sensible heat flux.
    publisherAmerican Meteorological Society
    titleA Study of Nocturnal Surface Wind Speed Overprediction by the WRF-ARW Model in Southeastern Texas
    typeJournal Paper
    journal volume52
    journal issue12
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-13-060.1
    journal fristpage2638
    journal lastpage2653
    treeJournal of Applied Meteorology and Climatology:;2013:;volume( 052 ):;issue: 012
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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