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    Numerical Tests of the Weak Pressure Gradient Approximation

    Source: Journal of the Atmospheric Sciences:;2012:;Volume( 069 ):;issue: 009::page 2846
    Author:
    Romps, David M.
    DOI: 10.1175/JAS-D-11-0337.1
    Publisher: American Meteorological Society
    Abstract: loud-resolving simulations of convection over a surface temperature hot spot are used to evaluate the weak pressure gradient (WPG) and weak temperature gradient (WTG) approximations. The premise of the relaxed form of WTG?that vertical velocity is equal to buoyancy times a positive time scale?is found to be violated by thick layers of negative buoyancy in steady-state ascent. The premise of WPG?that horizontal divergence and pressure anomalies are collocated?is validated by these simulations. When implemented in a cloud-resolving model, WPG replicates buoyancy transients exceptionally well, including the adiabatic lifting of air below buoyancy anomalies. WTG captures neither this effect nor the associated triggering of moist convection. For steady states, WTG produces vertical velocity profiles that are too top heavy. On the other hand, WPG generates velocity profiles that closely match fully resolved hot-spot simulations. Taken together, the evidence suggests that WPG is a relatively accurate method for parameterizing supradomain-scale (SDS) dynamics.
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      Numerical Tests of the Weak Pressure Gradient Approximation

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    contributor authorRomps, David M.
    date accessioned2017-06-09T16:54:55Z
    date available2017-06-09T16:54:55Z
    date copyright2012/09/01
    date issued2012
    identifier issn0022-4928
    identifier otherams-76425.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4218871
    description abstractloud-resolving simulations of convection over a surface temperature hot spot are used to evaluate the weak pressure gradient (WPG) and weak temperature gradient (WTG) approximations. The premise of the relaxed form of WTG?that vertical velocity is equal to buoyancy times a positive time scale?is found to be violated by thick layers of negative buoyancy in steady-state ascent. The premise of WPG?that horizontal divergence and pressure anomalies are collocated?is validated by these simulations. When implemented in a cloud-resolving model, WPG replicates buoyancy transients exceptionally well, including the adiabatic lifting of air below buoyancy anomalies. WTG captures neither this effect nor the associated triggering of moist convection. For steady states, WTG produces vertical velocity profiles that are too top heavy. On the other hand, WPG generates velocity profiles that closely match fully resolved hot-spot simulations. Taken together, the evidence suggests that WPG is a relatively accurate method for parameterizing supradomain-scale (SDS) dynamics.
    publisherAmerican Meteorological Society
    titleNumerical Tests of the Weak Pressure Gradient Approximation
    typeJournal Paper
    journal volume69
    journal issue9
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-11-0337.1
    journal fristpage2846
    journal lastpage2856
    treeJournal of the Atmospheric Sciences:;2012:;Volume( 069 ):;issue: 009
    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
    yabeshDSpacePersian