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    A 1D Theoretical Analysis of Northerly Low-Level Jets over the Great Plains

    Source: Journal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 010::page 3419
    Author:
    Gebauer, Joshua G.;Fedorovich, Evgeni;Shapiro, Alan
    DOI: 10.1175/JAS-D-16-0333.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe forcing of northerly low-level jets over the eastward-sloped terrain of the U.S. Great Plains was studied using a one-dimensional (1D) nonstationary analytical model based on the Boussinesq-approximated equations of motion and thermal energy. For northerly low-level jets, the forcing from diurnal changes in surface heating of the sloped terrain (Holton mechanism) is out of phase with the nocturnal inertial oscillation resulting from the cessation of turbulent mixing at sunset (Blackadar mechanism), which results in weaker northerly nocturnal low-level jets when compared to southerly nocturnal low-levels jets with the same-magnitude background pressure gradient forcing. Because of the Blackadar and Holton mechanisms acting out of phase, nocturnal northerly low-level jets cannot solely explain the northerly low-level jet maximum over the Great Plains found in climatological studies. It is shown that negative buoyancy values over the eastward-sloped terrain enhance the low-level northerly geostrophic wind, which can cause low-level jetlike wind profiles that do not necessarily depend on the diurnal cycle. However, nocturnal northerly low-level jets primarily caused by an inertial oscillation still occur when daytime mixing is strong and buoyancy is small at sunset. These conditions are possible when strong capping inversions are present in the daytime convective boundary layer. The occurrence of both types of northerly low-level jets, those caused by negative buoyancy values over the sloped terrain and those driven by an inertial oscillation, better explains the findings of previous low-level jet climatologies.
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      A 1D Theoretical Analysis of Northerly Low-Level Jets over the Great Plains

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4246467
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    contributor authorGebauer, Joshua G.;Fedorovich, Evgeni;Shapiro, Alan
    date accessioned2018-01-03T11:02:34Z
    date available2018-01-03T11:02:34Z
    date copyright8/9/2017 12:00:00 AM
    date issued2017
    identifier otherjas-d-16-0333.1.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4246467
    description abstractAbstractThe forcing of northerly low-level jets over the eastward-sloped terrain of the U.S. Great Plains was studied using a one-dimensional (1D) nonstationary analytical model based on the Boussinesq-approximated equations of motion and thermal energy. For northerly low-level jets, the forcing from diurnal changes in surface heating of the sloped terrain (Holton mechanism) is out of phase with the nocturnal inertial oscillation resulting from the cessation of turbulent mixing at sunset (Blackadar mechanism), which results in weaker northerly nocturnal low-level jets when compared to southerly nocturnal low-levels jets with the same-magnitude background pressure gradient forcing. Because of the Blackadar and Holton mechanisms acting out of phase, nocturnal northerly low-level jets cannot solely explain the northerly low-level jet maximum over the Great Plains found in climatological studies. It is shown that negative buoyancy values over the eastward-sloped terrain enhance the low-level northerly geostrophic wind, which can cause low-level jetlike wind profiles that do not necessarily depend on the diurnal cycle. However, nocturnal northerly low-level jets primarily caused by an inertial oscillation still occur when daytime mixing is strong and buoyancy is small at sunset. These conditions are possible when strong capping inversions are present in the daytime convective boundary layer. The occurrence of both types of northerly low-level jets, those caused by negative buoyancy values over the sloped terrain and those driven by an inertial oscillation, better explains the findings of previous low-level jet climatologies.
    publisherAmerican Meteorological Society
    titleA 1D Theoretical Analysis of Northerly Low-Level Jets over the Great Plains
    typeJournal Paper
    journal volume74
    journal issue10
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-16-0333.1
    journal fristpage3419
    journal lastpage3431
    treeJournal of the Atmospheric Sciences:;2017:;Volume( 074 ):;issue: 010
    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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