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    Tip Jets and Barrier Winds: A QuikSCAT Climatology of High Wind Speed Events around Greenland

    Source: Journal of Climate:;2005:;volume( 018 ):;issue: 018::page 3713
    Author:
    Moore, G. W. K.
    ,
    Renfrew, I. A.
    DOI: 10.1175/JCLI3455.1
    Publisher: American Meteorological Society
    Abstract: The high topography of Greenland results in a number of orographically induced high wind speed flows along its coast that are of interest from both a severe weather and climate perspective. Here the surface wind field dataset from the NASA?JPL SeaWinds scatterometer on board the Quick Scatterometer (QuikSCAT) satellite is used to develop a wintertime climatology of these flows. The high spatial resolution and the twice-daily sampling of the SeaWinds instrument allows for a much more detailed view of the surface winds around Greenland than has been previously possible. Three phenomena stand out as the most distinctive features of the surface wind field during the winter months: the previously identified tip jets and reverse tip jets, as well as the hitherto unrecognized barrier flows along its southeast coast in the vicinity of the Denmark Strait. Peak surface wind speeds associated with these phenomena can be as large as 50 m s?1 with winds over 25 m s?1 occurring approximately 10%?15% of the time at each location. A compositing technique is used to show that each type of flow is the result of an interaction between a synoptic-scale parent cyclone and the high topography of Greenland. In keeping with previous work, it is argued that tip jets are caused by a combination of conservation of the Bernoulli function during orographic descent and acceleration due to flow splitting as stable air passes around Cape Farewell, while barrier winds are a geostrophic response to stable air being forced against high topography. It is proposed that reverse tip jets occur when barrier winds reach the end of the topographic barrier and move from a geostrophic to a gradient wind balance, becoming supergeostrophic as a result of their anticyclonic curvature.
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      Tip Jets and Barrier Winds: A QuikSCAT Climatology of High Wind Speed Events around Greenland

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4220546
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    • Journal of Climate

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    contributor authorMoore, G. W. K.
    contributor authorRenfrew, I. A.
    date accessioned2017-06-09T17:00:51Z
    date available2017-06-09T17:00:51Z
    date copyright2005/09/01
    date issued2005
    identifier issn0894-8755
    identifier otherams-77933.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4220546
    description abstractThe high topography of Greenland results in a number of orographically induced high wind speed flows along its coast that are of interest from both a severe weather and climate perspective. Here the surface wind field dataset from the NASA?JPL SeaWinds scatterometer on board the Quick Scatterometer (QuikSCAT) satellite is used to develop a wintertime climatology of these flows. The high spatial resolution and the twice-daily sampling of the SeaWinds instrument allows for a much more detailed view of the surface winds around Greenland than has been previously possible. Three phenomena stand out as the most distinctive features of the surface wind field during the winter months: the previously identified tip jets and reverse tip jets, as well as the hitherto unrecognized barrier flows along its southeast coast in the vicinity of the Denmark Strait. Peak surface wind speeds associated with these phenomena can be as large as 50 m s?1 with winds over 25 m s?1 occurring approximately 10%?15% of the time at each location. A compositing technique is used to show that each type of flow is the result of an interaction between a synoptic-scale parent cyclone and the high topography of Greenland. In keeping with previous work, it is argued that tip jets are caused by a combination of conservation of the Bernoulli function during orographic descent and acceleration due to flow splitting as stable air passes around Cape Farewell, while barrier winds are a geostrophic response to stable air being forced against high topography. It is proposed that reverse tip jets occur when barrier winds reach the end of the topographic barrier and move from a geostrophic to a gradient wind balance, becoming supergeostrophic as a result of their anticyclonic curvature.
    publisherAmerican Meteorological Society
    titleTip Jets and Barrier Winds: A QuikSCAT Climatology of High Wind Speed Events around Greenland
    typeJournal Paper
    journal volume18
    journal issue18
    journal titleJournal of Climate
    identifier doi10.1175/JCLI3455.1
    journal fristpage3713
    journal lastpage3725
    treeJournal of Climate:;2005:;volume( 018 ):;issue: 018
    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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