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    The Diurnal Cycle of the Summertime Atmospheric Hydrologic Cycle over the Southwestern United States

    Source: Journal of Hydrometeorology:;2005:;Volume( 006 ):;issue: 002::page 219
    Author:
    Anderson, Bruce T.
    ,
    Kanamaru, Hideki
    DOI: 10.1175/JHM413.1
    Publisher: American Meteorological Society
    Abstract: Diurnal variations in the climatological large-scale summertime hydrologic cycle over the southwestern United States are examined using surface and upper-air observations along with regional model output. Rainfall rates are greatest during the daytime, but the hydrologic balance that supports this rainfall changes as the day progresses. During the late morning and early afternoon, the area-averaged rainfall is balanced predominantly by evapotranspiration augmented by low-level moisture convergence; moisture from these two sources is redistributed via eddy diffusion, resulting in an overall moistening of the atmosphere and a divergence of moisture aloft. During the late afternoon, vertical redistribution via eddy diffusion weakens considerably, although precipitation continues at approximately the same rate because of drying aloft, which also supports continued large-scale divergence of moisture at these levels. This large-scale divergence aloft persists at all times of day, suggesting that for the domain as a whole, precipitation is dependent upon low-level moisture sources. At finer scales, these balances are modified principally by the presence of moisture convergence/divergence centered on the elevated regions of the domain, suggesting that local balances may be more complex than the area-average balances described here.
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      The Diurnal Cycle of the Summertime Atmospheric Hydrologic Cycle over the Southwestern United States

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4224421
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    contributor authorAnderson, Bruce T.
    contributor authorKanamaru, Hideki
    date accessioned2017-06-09T17:13:43Z
    date available2017-06-09T17:13:43Z
    date copyright2005/04/01
    date issued2005
    identifier issn1525-755X
    identifier otherams-81420.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4224421
    description abstractDiurnal variations in the climatological large-scale summertime hydrologic cycle over the southwestern United States are examined using surface and upper-air observations along with regional model output. Rainfall rates are greatest during the daytime, but the hydrologic balance that supports this rainfall changes as the day progresses. During the late morning and early afternoon, the area-averaged rainfall is balanced predominantly by evapotranspiration augmented by low-level moisture convergence; moisture from these two sources is redistributed via eddy diffusion, resulting in an overall moistening of the atmosphere and a divergence of moisture aloft. During the late afternoon, vertical redistribution via eddy diffusion weakens considerably, although precipitation continues at approximately the same rate because of drying aloft, which also supports continued large-scale divergence of moisture at these levels. This large-scale divergence aloft persists at all times of day, suggesting that for the domain as a whole, precipitation is dependent upon low-level moisture sources. At finer scales, these balances are modified principally by the presence of moisture convergence/divergence centered on the elevated regions of the domain, suggesting that local balances may be more complex than the area-average balances described here.
    publisherAmerican Meteorological Society
    titleThe Diurnal Cycle of the Summertime Atmospheric Hydrologic Cycle over the Southwestern United States
    typeJournal Paper
    journal volume6
    journal issue2
    journal titleJournal of Hydrometeorology
    identifier doi10.1175/JHM413.1
    journal fristpage219
    journal lastpage228
    treeJournal of Hydrometeorology:;2005:;Volume( 006 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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