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    Role of Topography in Forcing Low-Level Jets in the Central United States during the 1993 Flood-Altered Terrain Simulations

    Source: Monthly Weather Review:;2004:;volume( 132 ):;issue: 001::page 396
    Author:
    Pan, Zaitao
    ,
    Segal, Moti
    ,
    Arritt, Raymond W.
    DOI: 10.1175/1520-0493(2004)132<0396:ROTIFL>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Regional model sensitivity simulations in which the height of elevated terrain was reduced to explore simulated changes in features of the low-level jet (LLJ) are presented. Such an approach has not been reported, and it provides complementary insight to the previous LLJ studies. The simulations were carried out for a 45-day period during the 1993 summer flood in the central United States, when strong LLJs were frequent. The simulations illustrate directly the significance of topographical blocking, leeside cyclogenesis, and terrain thermal effects exerted by the Rocky Mountains in support of LLJ formation. In particular, it is shown that in the absence of topography the ridging from the Bermuda high extended considerably westward with weaker southerly flow over the High Plains, thus diminishing the potential for LLJ development. The slope-induced nocturnal horizontal thermal gradient was indicated to have a significant role in the formation of the LLJ.
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      Role of Topography in Forcing Low-Level Jets in the Central United States during the 1993 Flood-Altered Terrain Simulations

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4205311
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    • Monthly Weather Review

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    contributor authorPan, Zaitao
    contributor authorSegal, Moti
    contributor authorArritt, Raymond W.
    date accessioned2017-06-09T16:15:15Z
    date available2017-06-09T16:15:15Z
    date copyright2004/01/01
    date issued2004
    identifier issn0027-0644
    identifier otherams-64221.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4205311
    description abstractRegional model sensitivity simulations in which the height of elevated terrain was reduced to explore simulated changes in features of the low-level jet (LLJ) are presented. Such an approach has not been reported, and it provides complementary insight to the previous LLJ studies. The simulations were carried out for a 45-day period during the 1993 summer flood in the central United States, when strong LLJs were frequent. The simulations illustrate directly the significance of topographical blocking, leeside cyclogenesis, and terrain thermal effects exerted by the Rocky Mountains in support of LLJ formation. In particular, it is shown that in the absence of topography the ridging from the Bermuda high extended considerably westward with weaker southerly flow over the High Plains, thus diminishing the potential for LLJ development. The slope-induced nocturnal horizontal thermal gradient was indicated to have a significant role in the formation of the LLJ.
    publisherAmerican Meteorological Society
    titleRole of Topography in Forcing Low-Level Jets in the Central United States during the 1993 Flood-Altered Terrain Simulations
    typeJournal Paper
    journal volume132
    journal issue1
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(2004)132<0396:ROTIFL>2.0.CO;2
    journal fristpage396
    journal lastpage403
    treeMonthly Weather Review:;2004:;volume( 132 ):;issue: 001
    contenttypeFulltext
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