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    Large Eddy Simulations of Upper-Ocean Response to a Midlatitude Storm and Comparison with Observations

    Source: Journal of Physical Oceanography:;2009:;Volume( 039 ):;issue: 009::page 2295
    Author:
    Li, Ming
    ,
    Vagle, Svein
    ,
    Farmer, David M.
    DOI: 10.1175/2009JPO4165.1
    Publisher: American Meteorological Society
    Abstract: A large eddy simulation (LES) model is used to investigate an upper-ocean response to a fall storm in the open ocean of the North Pacific Ocean. The storm is characterized by rapid increases in wind speed and surface heat loss but a relatively steady wave field. The LES model shows that surface convergence zones or windrows organize into line patterns aligned with the wind direction, evolving from nearly parallel lines to irregular structures featuring Y junctions as the wind speed increases. The downwelling-to-upwelling velocity ratio ranges between 1.2 and 1.6, indicating a moderate level of asymmetry between the downwelling and upwelling plumes in Langmuir circulation. During the storm, the turbulent Langmuir number Lat increases from 0.2 to 0.5 while the vertical turbulence intensity σw2 decreases from 1.4 to 0.7 u*2, where u* is the friction velocity. The order of turbulence intensities in three directions switches from crosswind ≈ vertical > downwind directions to downwind > crosswind > vertical directions. This suggests a transition from Langmuir to shear turbulence as the storm progresses. The Hoennikker number (Ho) remains below 0.1 and the strong evaporative heat loss does not contribute much to the turbulence generation in the ocean mixed layer. The LES results are compared with in situ and acoustic measurements collected during the storm. Patterns of model-predicted near-surface downwelling zones are in good agreement with horizontal distributions of bubble clouds revealed in sidescan sonar images. Striking similarity is also found in the temperature anomalies between the LES model and high-resolution thermistor chain measurements.
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      Large Eddy Simulations of Upper-Ocean Response to a Midlatitude Storm and Comparison with Observations

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    contributor authorLi, Ming
    contributor authorVagle, Svein
    contributor authorFarmer, David M.
    date accessioned2017-06-09T16:30:43Z
    date available2017-06-09T16:30:43Z
    date copyright2009/09/01
    date issued2009
    identifier issn0022-3670
    identifier otherams-69186.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4210827
    description abstractA large eddy simulation (LES) model is used to investigate an upper-ocean response to a fall storm in the open ocean of the North Pacific Ocean. The storm is characterized by rapid increases in wind speed and surface heat loss but a relatively steady wave field. The LES model shows that surface convergence zones or windrows organize into line patterns aligned with the wind direction, evolving from nearly parallel lines to irregular structures featuring Y junctions as the wind speed increases. The downwelling-to-upwelling velocity ratio ranges between 1.2 and 1.6, indicating a moderate level of asymmetry between the downwelling and upwelling plumes in Langmuir circulation. During the storm, the turbulent Langmuir number Lat increases from 0.2 to 0.5 while the vertical turbulence intensity σw2 decreases from 1.4 to 0.7 u*2, where u* is the friction velocity. The order of turbulence intensities in three directions switches from crosswind ≈ vertical > downwind directions to downwind > crosswind > vertical directions. This suggests a transition from Langmuir to shear turbulence as the storm progresses. The Hoennikker number (Ho) remains below 0.1 and the strong evaporative heat loss does not contribute much to the turbulence generation in the ocean mixed layer. The LES results are compared with in situ and acoustic measurements collected during the storm. Patterns of model-predicted near-surface downwelling zones are in good agreement with horizontal distributions of bubble clouds revealed in sidescan sonar images. Striking similarity is also found in the temperature anomalies between the LES model and high-resolution thermistor chain measurements.
    publisherAmerican Meteorological Society
    titleLarge Eddy Simulations of Upper-Ocean Response to a Midlatitude Storm and Comparison with Observations
    typeJournal Paper
    journal volume39
    journal issue9
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/2009JPO4165.1
    journal fristpage2295
    journal lastpage2309
    treeJournal of Physical Oceanography:;2009:;Volume( 039 ):;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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