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    The Large-Scale Environments of the Global Populations of Mesoscale Convective Complexes

    Source: Monthly Weather Review:;2000:;volume( 128 ):;issue: 008::page 2756
    Author:
    Laing, Arlene G.
    ,
    Fritsch, J. Michael
    DOI: 10.1175/1520-0493(2000)128<2756:TLSEOT>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The mean genesis environment was constructed for each of five mesoscale convective complex (MCC) population centers around the world: Africa, Australia, China, South America, and the United States. It is found that the environments are very similar and exhibit many of the same dynamic and thermodynamic structures that are present with systems in the United States. In particular, MCCs initiate within prominent baroclinic zones characterized by locally large values of lower-tropospheric vertical wind shear and convective available potential energy (CAPE). Typically, a low-level jet of air with low static stability, high equivalent potential temperature, oriented nearly perpendicular to the baroclinic zone, intrudes into the genesis region and is forced to ascend over a relatively shallow, surface-based layer of relatively cool air. Pronounced warm advection accompanied by strong lower-tropospheric veering overlays the surface-based cool layer. A local maximum in absolute humidity and a local minimum in static stability mark the favored region for formation of the convective system. Low-level convergence, upper-level divergence, and an approaching midlevel vorticity maximum associated with a weak short-wave trough are also typical of the mean genesis environment.
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      The Large-Scale Environments of the Global Populations of Mesoscale Convective Complexes

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4204592
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    contributor authorLaing, Arlene G.
    contributor authorFritsch, J. Michael
    date accessioned2017-06-09T16:13:15Z
    date available2017-06-09T16:13:15Z
    date copyright2000/08/01
    date issued2000
    identifier issn0027-0644
    identifier otherams-63574.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4204592
    description abstractThe mean genesis environment was constructed for each of five mesoscale convective complex (MCC) population centers around the world: Africa, Australia, China, South America, and the United States. It is found that the environments are very similar and exhibit many of the same dynamic and thermodynamic structures that are present with systems in the United States. In particular, MCCs initiate within prominent baroclinic zones characterized by locally large values of lower-tropospheric vertical wind shear and convective available potential energy (CAPE). Typically, a low-level jet of air with low static stability, high equivalent potential temperature, oriented nearly perpendicular to the baroclinic zone, intrudes into the genesis region and is forced to ascend over a relatively shallow, surface-based layer of relatively cool air. Pronounced warm advection accompanied by strong lower-tropospheric veering overlays the surface-based cool layer. A local maximum in absolute humidity and a local minimum in static stability mark the favored region for formation of the convective system. Low-level convergence, upper-level divergence, and an approaching midlevel vorticity maximum associated with a weak short-wave trough are also typical of the mean genesis environment.
    publisherAmerican Meteorological Society
    titleThe Large-Scale Environments of the Global Populations of Mesoscale Convective Complexes
    typeJournal Paper
    journal volume128
    journal issue8
    journal titleMonthly Weather Review
    identifier doi10.1175/1520-0493(2000)128<2756:TLSEOT>2.0.CO;2
    journal fristpage2756
    journal lastpage2776
    treeMonthly Weather Review:;2000:;volume( 128 ):;issue: 008
    contenttypeFulltext
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