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    Long-Term Simulations of Thermally Driven Flows and Orographic Convection at Convection-Parameterizing and Cloud-Resolving Resolutions

    Source: Journal of Applied Meteorology and Climatology:;2013:;volume( 052 ):;issue: 006::page 1490
    Author:
    Langhans, Wolfgang
    ,
    Schmidli, Juerg
    ,
    Fuhrer, Oliver
    ,
    Bieri, Susanne
    ,
    Schär, Christoph
    DOI: 10.1175/JAMC-D-12-0167.1
    Publisher: American Meteorological Society
    Abstract: he purpose of this paper is to validate the representation of topographic flows and moist convection over the European Alps in a convection-parameterizing simulation (CPM; ?x = 6.6 km) and two cloud-resolving simulations (CRM; ?x = 1.1 and 2.2 km). All simulations and further sensitivity experiments are validated against a large set of observations for an 18-day fair-weather summer period. The episode considered is characterized by pronounced plain?valley pressure gradients, strong daytime upvalley flows, and weak nighttime down-valley flows. In addition, convective precipitation is recorded during the late afternoon and is preceded by a phase of shallow convection. The observed transition from shallow to deep convection occurs within a 3-h period. The results indicate good agreement between both CRMs and the observed diurnal evolution in terms of near-surface winds, cloud formation, and precipitation. The differences between the two CRMs are surprisingly small. In contrast, the CPM produces too-early peaks of cloud cover and precipitation that are due to a too-early activation of deep convection. Detailed sensitivity experiments show that the convection scheme, rather than the underresolved small-scale topography, is responsible for the poor performance of the CPM. In addition, observations and simulations show that late-morning mass convergence does not correlate with afternoon precipitation. Rather, it is found that enhanced convective activity is related to increased conditional instability.
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      Long-Term Simulations of Thermally Driven Flows and Orographic Convection at Convection-Parameterizing and Cloud-Resolving Resolutions

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4216980
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    contributor authorLanghans, Wolfgang
    contributor authorSchmidli, Juerg
    contributor authorFuhrer, Oliver
    contributor authorBieri, Susanne
    contributor authorSchär, Christoph
    date accessioned2017-06-09T16:49:15Z
    date available2017-06-09T16:49:15Z
    date copyright2013/06/01
    date issued2013
    identifier issn1558-8424
    identifier otherams-74723.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4216980
    description abstracthe purpose of this paper is to validate the representation of topographic flows and moist convection over the European Alps in a convection-parameterizing simulation (CPM; ?x = 6.6 km) and two cloud-resolving simulations (CRM; ?x = 1.1 and 2.2 km). All simulations and further sensitivity experiments are validated against a large set of observations for an 18-day fair-weather summer period. The episode considered is characterized by pronounced plain?valley pressure gradients, strong daytime upvalley flows, and weak nighttime down-valley flows. In addition, convective precipitation is recorded during the late afternoon and is preceded by a phase of shallow convection. The observed transition from shallow to deep convection occurs within a 3-h period. The results indicate good agreement between both CRMs and the observed diurnal evolution in terms of near-surface winds, cloud formation, and precipitation. The differences between the two CRMs are surprisingly small. In contrast, the CPM produces too-early peaks of cloud cover and precipitation that are due to a too-early activation of deep convection. Detailed sensitivity experiments show that the convection scheme, rather than the underresolved small-scale topography, is responsible for the poor performance of the CPM. In addition, observations and simulations show that late-morning mass convergence does not correlate with afternoon precipitation. Rather, it is found that enhanced convective activity is related to increased conditional instability.
    publisherAmerican Meteorological Society
    titleLong-Term Simulations of Thermally Driven Flows and Orographic Convection at Convection-Parameterizing and Cloud-Resolving Resolutions
    typeJournal Paper
    journal volume52
    journal issue6
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-12-0167.1
    journal fristpage1490
    journal lastpage1510
    treeJournal of Applied Meteorology and Climatology:;2013:;volume( 052 ):;issue: 006
    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