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    Thermally Driven Flows at an Asymmetric Valley Exit: Observations and Model Studies at the Lech Valley Exit

    Source: Monthly Weather Review:;2009:;volume( 137 ):;issue: 010::page 3437
    Author:
    Spengler, Thomas
    ,
    Schween, Jan H.
    ,
    Ablinger, Markus
    ,
    Zängl, Günther
    ,
    Egger, Joseph
    DOI: 10.1175/2009MWR2779.1
    Publisher: American Meteorological Society
    Abstract: The summertime thermal circulation in the region of an asymmetric valley exit is investigated by means of observations and high-resolution model simulations. The northeastward-oriented Alpine Lech Valley opening into the Bavarian Alpine foreland has an eastern slope exceeding the western slope by about 15 km. Northerly winds along the eastern slope are frequently observed, reaching substantial strength during fair weather conditions. A field experiment has been conducted to explore this phenomenon and to pinpoint the connection of the northeasterly flow to the Lech Valley wind circulation. Numerical simulations have also been carried out to support the interpretation of the observations. It is found that the northerlies owe their existence to the dominantly easterly flow along the foothills of the Alps, which is partly induced by the Alpine heat low but may be strengthened by favorable synoptic conditions. Examples for both situations will be discussed. The diurnal flow in the Lech Valley has little obvious impact on these northeasterlies. On days with moderate synoptic easterly flow, a wake is present on the lee of the eastern slope of the exit region, accompanied by a shear zone along the edge of the wake. This shear zone is forced southward during the daytime because of thermally initiated pressure gradients between the Alpine foreland and the Alps, leading to sudden wind changes in the exit area at the time of its passage.
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      Thermally Driven Flows at an Asymmetric Valley Exit: Observations and Model Studies at the Lech Valley Exit

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4211156
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    contributor authorSpengler, Thomas
    contributor authorSchween, Jan H.
    contributor authorAblinger, Markus
    contributor authorZängl, Günther
    contributor authorEgger, Joseph
    date accessioned2017-06-09T16:31:48Z
    date available2017-06-09T16:31:48Z
    date copyright2009/10/01
    date issued2009
    identifier issn0027-0644
    identifier otherams-69482.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211156
    description abstractThe summertime thermal circulation in the region of an asymmetric valley exit is investigated by means of observations and high-resolution model simulations. The northeastward-oriented Alpine Lech Valley opening into the Bavarian Alpine foreland has an eastern slope exceeding the western slope by about 15 km. Northerly winds along the eastern slope are frequently observed, reaching substantial strength during fair weather conditions. A field experiment has been conducted to explore this phenomenon and to pinpoint the connection of the northeasterly flow to the Lech Valley wind circulation. Numerical simulations have also been carried out to support the interpretation of the observations. It is found that the northerlies owe their existence to the dominantly easterly flow along the foothills of the Alps, which is partly induced by the Alpine heat low but may be strengthened by favorable synoptic conditions. Examples for both situations will be discussed. The diurnal flow in the Lech Valley has little obvious impact on these northeasterlies. On days with moderate synoptic easterly flow, a wake is present on the lee of the eastern slope of the exit region, accompanied by a shear zone along the edge of the wake. This shear zone is forced southward during the daytime because of thermally initiated pressure gradients between the Alpine foreland and the Alps, leading to sudden wind changes in the exit area at the time of its passage.
    publisherAmerican Meteorological Society
    titleThermally Driven Flows at an Asymmetric Valley Exit: Observations and Model Studies at the Lech Valley Exit
    typeJournal Paper
    journal volume137
    journal issue10
    journal titleMonthly Weather Review
    identifier doi10.1175/2009MWR2779.1
    journal fristpage3437
    journal lastpage3455
    treeMonthly Weather Review:;2009:;volume( 137 ):;issue: 010
    contenttypeFulltext
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