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    Effects of Persistent, Midlatitude Mesoscale Regions of Convection on the Large-Scale Environment during the Warm Season

    Source: Journal of the Atmospheric Sciences:;1996:;Volume( 053 ):;issue: 023::page 3503
    Author:
    Stensrud, David J.
    DOI: 10.1175/1520-0469(1996)053<3503:EOPMMR>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Over a 2½-day period beginning 0000 UTC 11 May 1982, 15 mesoscale convective systems (MCSs) developed and moved eastward across the moist axis located over the southern plains of the United States. While the 6?18-h lifetimes of each of these individual MCSs are not sufficiently long to influence the large-scale environment greatly, it is possible that the cumulative effects of the entire group of MCSs can produce significant changes in the large-scale flow patterns. This hypothesis is investigated using output from two runs of a sophisticated mesoscale model. One run includes the effects of convection, and the other does not. Results indicate that in low levels, the inflow of warm, moist air into the convective region is increased when convection is allowed in the model, enhancing the likelihood that convection will continue and thereby acting as a positive feedback mechanism. In upper levels, the convection acts as a Rossby wave source region and produces significant upper-level perturbations that cover at least 50° longitude spread. Convective effects also influence cyclogenesis since the MCSs strengthen the low-level baroclinicity and modify the phase relationship between pressure and thermal waves in the midlevels. Thus, it is clear that the effects of a persistent, mesoscale region of convection on the large-scale environment are substantial.
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      Effects of Persistent, Midlatitude Mesoscale Regions of Convection on the Large-Scale Environment during the Warm Season

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4158275
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    contributor authorStensrud, David J.
    date accessioned2017-06-09T14:34:13Z
    date available2017-06-09T14:34:13Z
    date copyright1996/12/01
    date issued1996
    identifier issn0022-4928
    identifier otherams-21887.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4158275
    description abstractOver a 2½-day period beginning 0000 UTC 11 May 1982, 15 mesoscale convective systems (MCSs) developed and moved eastward across the moist axis located over the southern plains of the United States. While the 6?18-h lifetimes of each of these individual MCSs are not sufficiently long to influence the large-scale environment greatly, it is possible that the cumulative effects of the entire group of MCSs can produce significant changes in the large-scale flow patterns. This hypothesis is investigated using output from two runs of a sophisticated mesoscale model. One run includes the effects of convection, and the other does not. Results indicate that in low levels, the inflow of warm, moist air into the convective region is increased when convection is allowed in the model, enhancing the likelihood that convection will continue and thereby acting as a positive feedback mechanism. In upper levels, the convection acts as a Rossby wave source region and produces significant upper-level perturbations that cover at least 50° longitude spread. Convective effects also influence cyclogenesis since the MCSs strengthen the low-level baroclinicity and modify the phase relationship between pressure and thermal waves in the midlevels. Thus, it is clear that the effects of a persistent, mesoscale region of convection on the large-scale environment are substantial.
    publisherAmerican Meteorological Society
    titleEffects of Persistent, Midlatitude Mesoscale Regions of Convection on the Large-Scale Environment during the Warm Season
    typeJournal Paper
    journal volume53
    journal issue23
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1996)053<3503:EOPMMR>2.0.CO;2
    journal fristpage3503
    journal lastpage3527
    treeJournal of the Atmospheric Sciences:;1996:;Volume( 053 ):;issue: 023
    contenttypeFulltext
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