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    Mesoscale Ascent in Nocturnal Low-Level Jets

    Source: Journal of the Atmospheric Sciences:;2018:;volume 075:;issue 005::page 1403
    Author:
    Shapiro, Alan
    ,
    Fedorovich, Evgeni
    ,
    Gebauer, Joshua G.
    DOI: 10.1175/JAS-D-17-0279.1
    Publisher: American Meteorological Society
    Abstract: AbstractA theory for gentle but persistent mesoscale ascent in the lower troposphere is developed in which the vertical motion arises as an inertia?gravity wave response to the sudden decrease of turbulent mixing in a horizontally heterogeneous convective boundary layer (CBL). The zone of ascent is centered on the local maximum of a laterally varying buoyancy field (warm tongue in the CBL). The shutdown also triggers a Blackadar-type inertial oscillation and associated low-level jet (LLJ). These nocturnal motions are studied analytically using the linearized two-dimensional Boussinesq equations of motion, thermal energy, and mass conservation for an inviscid stably stratified fluid, with the initial state described by a zero-order jump model of a CBL. The vertical velocity revealed by the analytical solution increases with the amplitude of the buoyancy variation, CBL depth, and wavenumber of the buoyancy variation (larger vertical velocity for smaller-scale variations). Stable stratification in the free atmosphere has a lid effect, with a larger buoyancy frequency associated with a smaller vertical velocity. For the parameter values typical of the southern Great Plains warm season, the peak vertical velocity is ~3?10 cm s?1, with parcels rising ~0.3?1 km over the ~6?8-h duration of the ascent phase. Data from the 2015 Plains Elevated Convection at Night (PECAN) field project were used as a qualitative check on the hypothesis that the same mechanism that triggers nocturnal LLJs from CBLs can induce gentle but persistent ascent in the presence of a warm tongue.
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      Mesoscale Ascent in Nocturnal Low-Level Jets

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    contributor authorShapiro, Alan
    contributor authorFedorovich, Evgeni
    contributor authorGebauer, Joshua G.
    date accessioned2019-09-19T10:07:36Z
    date available2019-09-19T10:07:36Z
    date copyright2/26/2018 12:00:00 AM
    date issued2018
    identifier otherjas-d-17-0279.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4261823
    description abstractAbstractA theory for gentle but persistent mesoscale ascent in the lower troposphere is developed in which the vertical motion arises as an inertia?gravity wave response to the sudden decrease of turbulent mixing in a horizontally heterogeneous convective boundary layer (CBL). The zone of ascent is centered on the local maximum of a laterally varying buoyancy field (warm tongue in the CBL). The shutdown also triggers a Blackadar-type inertial oscillation and associated low-level jet (LLJ). These nocturnal motions are studied analytically using the linearized two-dimensional Boussinesq equations of motion, thermal energy, and mass conservation for an inviscid stably stratified fluid, with the initial state described by a zero-order jump model of a CBL. The vertical velocity revealed by the analytical solution increases with the amplitude of the buoyancy variation, CBL depth, and wavenumber of the buoyancy variation (larger vertical velocity for smaller-scale variations). Stable stratification in the free atmosphere has a lid effect, with a larger buoyancy frequency associated with a smaller vertical velocity. For the parameter values typical of the southern Great Plains warm season, the peak vertical velocity is ~3?10 cm s?1, with parcels rising ~0.3?1 km over the ~6?8-h duration of the ascent phase. Data from the 2015 Plains Elevated Convection at Night (PECAN) field project were used as a qualitative check on the hypothesis that the same mechanism that triggers nocturnal LLJs from CBLs can induce gentle but persistent ascent in the presence of a warm tongue.
    publisherAmerican Meteorological Society
    titleMesoscale Ascent in Nocturnal Low-Level Jets
    typeJournal Paper
    journal volume75
    journal issue5
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-17-0279.1
    journal fristpage1403
    journal lastpage1427
    treeJournal of the Atmospheric Sciences:;2018:;volume 075:;issue 005
    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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