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    On the Controls of Daytime Precipitation in the Amazonian Dry Season

    Source: Journal of Hydrometeorology:;2016:;Volume( 017 ):;issue: 012::page 3079
    Author:
    Ghate, Virendra P.
    ,
    Kollias, Pavlos
    DOI: 10.1175/JHM-D-16-0101.1
    Publisher: American Meteorological Society
    Abstract: he Amazon plays an important role in the global energy and hydrological budgets. The precipitation during the dry season (June?September) plays a critical role in maintaining the extent of the rain forest. The deployment of the first Atmospheric Radiation Measurement (ARM) Mobile Facility (AMF-1) in the context of the Green Ocean Amazon (GOAmazon) field campaign at Manacapuru, Brazil, provided comprehensive measurements of surface, cloud, precipitation, radiation, and thermodynamic properties for two complete dry seasons (2014 and 2015). The precipitation events occurring during the nighttime were associated with propagating storm systems (nonlocal effects), while the daytime precipitation events were primarily a result of local land?atmosphere interactions. During the two dry seasons, precipitation was recorded at the surface on 106 days (43%) from 158 rain events with 82 daytime precipitation events occurring on 64 days (60.37%). Detailed comparisons between the diurnal cycles of surface and profile properties between days with and without daytime precipitation suggested the increased moisture at low and midlevels to be responsible for lowering the lifting condensation level, reducing convective inhibition and entrainment, and thus triggering the transition from shallow to deep convection. Although the monthly accumulated rainfall decreased during the progression of the dry season, the contribution of daytime precipitation to it increased, suggesting the decrease to be mainly due to reduction in propagating squall lines. The control of daytime precipitation during the dry season on large-scale moisture advection above the boundary layer and the total rainfall on propagating squall lines suggests that coarse-resolution models should be able to accurately simulate the dry season precipitation over the Amazon basin.
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      On the Controls of Daytime Precipitation in the Amazonian Dry Season

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    contributor authorGhate, Virendra P.
    contributor authorKollias, Pavlos
    date accessioned2017-06-09T17:17:13Z
    date available2017-06-09T17:17:13Z
    date copyright2016/12/01
    date issued2016
    identifier issn1525-755X
    identifier otherams-82423.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4225536
    description abstracthe Amazon plays an important role in the global energy and hydrological budgets. The precipitation during the dry season (June?September) plays a critical role in maintaining the extent of the rain forest. The deployment of the first Atmospheric Radiation Measurement (ARM) Mobile Facility (AMF-1) in the context of the Green Ocean Amazon (GOAmazon) field campaign at Manacapuru, Brazil, provided comprehensive measurements of surface, cloud, precipitation, radiation, and thermodynamic properties for two complete dry seasons (2014 and 2015). The precipitation events occurring during the nighttime were associated with propagating storm systems (nonlocal effects), while the daytime precipitation events were primarily a result of local land?atmosphere interactions. During the two dry seasons, precipitation was recorded at the surface on 106 days (43%) from 158 rain events with 82 daytime precipitation events occurring on 64 days (60.37%). Detailed comparisons between the diurnal cycles of surface and profile properties between days with and without daytime precipitation suggested the increased moisture at low and midlevels to be responsible for lowering the lifting condensation level, reducing convective inhibition and entrainment, and thus triggering the transition from shallow to deep convection. Although the monthly accumulated rainfall decreased during the progression of the dry season, the contribution of daytime precipitation to it increased, suggesting the decrease to be mainly due to reduction in propagating squall lines. The control of daytime precipitation during the dry season on large-scale moisture advection above the boundary layer and the total rainfall on propagating squall lines suggests that coarse-resolution models should be able to accurately simulate the dry season precipitation over the Amazon basin.
    publisherAmerican Meteorological Society
    titleOn the Controls of Daytime Precipitation in the Amazonian Dry Season
    typeJournal Paper
    journal volume17
    journal issue12
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/JHM-D-16-0101.1
    journal fristpage3079
    journal lastpage3097
    treeJournal of Hydrometeorology:;2016:;Volume( 017 ):;issue: 012
    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