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    Upward Momentum Transfer in the Marine Boundary Layer

    Source: Journal of Physical Oceanography:;2001:;Volume( 031 ):;issue: 007::page 1698
    Author:
    Grachev, A. A.
    ,
    Fairall, C. W.
    DOI: 10.1175/1520-0485(2001)031<1698:UMTITM>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: This paper focuses on the study of momentum flux between ocean and atmosphere in light winds and is based on the data collected during several field campaigns, the Atlantic Stratocumulus Transition Experiment, the Tropical Ocean Global Atmosphere Coupled Ocean?Atmosphere Response Experiment, and the San Clemente Ocean Probing Experiment. Weak wind at sea is frequently accompanied by the presence of fast-traveling ocean swell, which dramatically affects momentum transfer. It is found that the mean momentum flux (uw covariance) decreases monotonically with decreasing wind speed, and reaches zero around a wind speed U ≈ 1.5?2 m s?1, which corresponds to wave age cp/U ≈ 10 for wave/swell conditions of the experiments in this study. Further decrease of the wind speed (i.e., increase of the wave age) leads to a sign reversal of the momentum flux, implying negative drag coefficient. Upward momentum transfer is associated with fast-traveling swell running in the same direction as the wind, and this regime can be treated as swell regime or mature sea state. In the swell regime the surface stress vector is nearly opposite to wind and swell directions, and the wind is roughly aligned in the swell direction. Thus, a weak wind over ocean swell can be frequently associated with upward momentum transfer (i.e., from ocean to atmosphere).
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      Upward Momentum Transfer in the Marine Boundary Layer

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    contributor authorGrachev, A. A.
    contributor authorFairall, C. W.
    date accessioned2017-06-09T14:54:35Z
    date available2017-06-09T14:54:35Z
    date copyright2001/07/01
    date issued2001
    identifier issn0022-3670
    identifier otherams-29458.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4166687
    description abstractThis paper focuses on the study of momentum flux between ocean and atmosphere in light winds and is based on the data collected during several field campaigns, the Atlantic Stratocumulus Transition Experiment, the Tropical Ocean Global Atmosphere Coupled Ocean?Atmosphere Response Experiment, and the San Clemente Ocean Probing Experiment. Weak wind at sea is frequently accompanied by the presence of fast-traveling ocean swell, which dramatically affects momentum transfer. It is found that the mean momentum flux (uw covariance) decreases monotonically with decreasing wind speed, and reaches zero around a wind speed U ≈ 1.5?2 m s?1, which corresponds to wave age cp/U ≈ 10 for wave/swell conditions of the experiments in this study. Further decrease of the wind speed (i.e., increase of the wave age) leads to a sign reversal of the momentum flux, implying negative drag coefficient. Upward momentum transfer is associated with fast-traveling swell running in the same direction as the wind, and this regime can be treated as swell regime or mature sea state. In the swell regime the surface stress vector is nearly opposite to wind and swell directions, and the wind is roughly aligned in the swell direction. Thus, a weak wind over ocean swell can be frequently associated with upward momentum transfer (i.e., from ocean to atmosphere).
    publisherAmerican Meteorological Society
    titleUpward Momentum Transfer in the Marine Boundary Layer
    typeJournal Paper
    journal volume31
    journal issue7
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(2001)031<1698:UMTITM>2.0.CO;2
    journal fristpage1698
    journal lastpage1711
    treeJournal of Physical Oceanography:;2001:;Volume( 031 ):;issue: 007
    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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