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    Mechanism of Urbanization Impact on a Summer Cold-Frontal Rainfall Process in the Greater Beijing Metropolitan Area

    Source: Journal of Applied Meteorology and Climatology:;2015:;volume( 054 ):;issue: 006::page 1234
    Author:
    Zhong, Shi
    ,
    Yang, Xiu-Qun
    DOI: 10.1175/JAMC-D-14-0264.1
    Publisher: American Meteorological Society
    Abstract: he WRF?Noah?urban canopy model (UCM) coupled modeling system is used to investigate the influence of urbanization on a typical frontal rainfall event that occurred in June 2008 over the greater Beijing metropolitan area (GBMA). The comparison between results of two experiments with and without the presence of urban areas suggests that more precipitation can be induced over and in the area downwind of Beijing because of the urbanization effects while less rainfall is found in the upwind region of central urban areas. The urbanization effects delay the onset of precipitation over Beijing but keep it sustained for a longer period with stronger rainfall intensity. The underlying urban surface not only retards the cold-frontal movement but also favors the development of a wet and unstable atmosphere. This explains why the precipitation can be sustained for a longer time with higher rainfall intensity over urban areas. From analyses of a density-current speed equation, it is found that the abrupt pressure jump during the frontal passage has a significant influence on the cold-frontal movement. A method derived from the surface pressure tendency equation is used to explore the mechanism of urban effects on the cold-frontal system. The cold advection is less intense in the experiment with urban land surface than in the experiment with urban areas replaced by cropland. Hence, the weaker-than-normal cold advection and subsequent smaller pressure jump during the frontal passage over the GBMA are the major mechanisms behind the urbanization effects, which lead to the retardation of the cold-frontal movement and late onset of precipitation over the GBMA.
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      Mechanism of Urbanization Impact on a Summer Cold-Frontal Rainfall Process in the Greater Beijing Metropolitan Area

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4217449
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    contributor authorZhong, Shi
    contributor authorYang, Xiu-Qun
    date accessioned2017-06-09T16:50:38Z
    date available2017-06-09T16:50:38Z
    date copyright2015/06/01
    date issued2015
    identifier issn1558-8424
    identifier otherams-75145.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4217449
    description abstracthe WRF?Noah?urban canopy model (UCM) coupled modeling system is used to investigate the influence of urbanization on a typical frontal rainfall event that occurred in June 2008 over the greater Beijing metropolitan area (GBMA). The comparison between results of two experiments with and without the presence of urban areas suggests that more precipitation can be induced over and in the area downwind of Beijing because of the urbanization effects while less rainfall is found in the upwind region of central urban areas. The urbanization effects delay the onset of precipitation over Beijing but keep it sustained for a longer period with stronger rainfall intensity. The underlying urban surface not only retards the cold-frontal movement but also favors the development of a wet and unstable atmosphere. This explains why the precipitation can be sustained for a longer time with higher rainfall intensity over urban areas. From analyses of a density-current speed equation, it is found that the abrupt pressure jump during the frontal passage has a significant influence on the cold-frontal movement. A method derived from the surface pressure tendency equation is used to explore the mechanism of urban effects on the cold-frontal system. The cold advection is less intense in the experiment with urban land surface than in the experiment with urban areas replaced by cropland. Hence, the weaker-than-normal cold advection and subsequent smaller pressure jump during the frontal passage over the GBMA are the major mechanisms behind the urbanization effects, which lead to the retardation of the cold-frontal movement and late onset of precipitation over the GBMA.
    publisherAmerican Meteorological Society
    titleMechanism of Urbanization Impact on a Summer Cold-Frontal Rainfall Process in the Greater Beijing Metropolitan Area
    typeJournal Paper
    journal volume54
    journal issue6
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-14-0264.1
    journal fristpage1234
    journal lastpage1247
    treeJournal of Applied Meteorology and Climatology:;2015:;volume( 054 ):;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
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