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    Quasigeostrophic Forecasting and Physical Processes of Iceland-Faroe Frontal Variability

    Source: Journal of Physical Oceanography:;1995:;Volume( 025 ):;issue: 006::page 1273
    Author:
    Miller, Arthur J.
    ,
    Poulain, Pierre-Marie
    ,
    Warn-Varnas, Alex
    ,
    Arango, Hernan G.
    ,
    Robinson, Allan R.
    ,
    Leslie, Wayne G.
    DOI: 10.1175/1520-0485(1995)025<1273:QFAPPO>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Using a hydrocast survey of the Iceland-Faroe Front (IFF) from October 1992, quasigeostrophic forecasts are studied to validate their efficacy and to diagnose the physical processes involved in the rapid growth of a cold tongue intrusion. Explorations of 1) the choice of initial objective analysis parameters, 2) the depth of the unknown level of no motion, 3) the effects of surrounding mesoscale activity, 4) variations in the boundary conditions, and 5) simple assimilation of newly acquired data into the forecasts are carried out. Using a feature validation technique, which incorporates a 1) validating hydrocast survey, 2) satellite SST images, and 3) surface drifter observations, most of the forecasts are found to perform well in capturing the key events of the validation strategy, particularly the development of the cold tongue intrusion (though it tends to develop somewhat more weakly and slightly farther downstream than observed). Sharp resolution of frontal structure (to capture seed anomalies in the IFF, which later can grow to large amplitude) and smooth representation of far-field boundary conditions (to eliminate spurious persistent inflow/outflow at the boundaries, which can corrupt developing interior flows) are found to be crucial in generating good forecasts. An analysis of the potential and kinetic energy equations in the region of the developing cold tongue intrusion reveals a clear signature of baroclinic instability. Topography has little influence on this particular instability event because it tends to be surface intensified and occurs rapidly over a timescale of 3?5 days.
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      Quasigeostrophic Forecasting and Physical Processes of Iceland-Faroe Frontal Variability

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    contributor authorMiller, Arthur J.
    contributor authorPoulain, Pierre-Marie
    contributor authorWarn-Varnas, Alex
    contributor authorArango, Hernan G.
    contributor authorRobinson, Allan R.
    contributor authorLeslie, Wayne G.
    date accessioned2017-06-09T14:51:30Z
    date available2017-06-09T14:51:30Z
    date copyright1995/06/01
    date issued1995
    identifier issn0022-3670
    identifier otherams-28328.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4165432
    description abstractUsing a hydrocast survey of the Iceland-Faroe Front (IFF) from October 1992, quasigeostrophic forecasts are studied to validate their efficacy and to diagnose the physical processes involved in the rapid growth of a cold tongue intrusion. Explorations of 1) the choice of initial objective analysis parameters, 2) the depth of the unknown level of no motion, 3) the effects of surrounding mesoscale activity, 4) variations in the boundary conditions, and 5) simple assimilation of newly acquired data into the forecasts are carried out. Using a feature validation technique, which incorporates a 1) validating hydrocast survey, 2) satellite SST images, and 3) surface drifter observations, most of the forecasts are found to perform well in capturing the key events of the validation strategy, particularly the development of the cold tongue intrusion (though it tends to develop somewhat more weakly and slightly farther downstream than observed). Sharp resolution of frontal structure (to capture seed anomalies in the IFF, which later can grow to large amplitude) and smooth representation of far-field boundary conditions (to eliminate spurious persistent inflow/outflow at the boundaries, which can corrupt developing interior flows) are found to be crucial in generating good forecasts. An analysis of the potential and kinetic energy equations in the region of the developing cold tongue intrusion reveals a clear signature of baroclinic instability. Topography has little influence on this particular instability event because it tends to be surface intensified and occurs rapidly over a timescale of 3?5 days.
    publisherAmerican Meteorological Society
    titleQuasigeostrophic Forecasting and Physical Processes of Iceland-Faroe Frontal Variability
    typeJournal Paper
    journal volume25
    journal issue6
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/1520-0485(1995)025<1273:QFAPPO>2.0.CO;2
    journal fristpage1273
    journal lastpage1295
    treeJournal of Physical Oceanography:;1995:;Volume( 025 ):;issue: 006
    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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