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    Observed Spatial Characteristics of Beijing Urban Climate Impacts on Summer Thunderstorms

    Source: Journal of Applied Meteorology and Climatology:;2014:;volume( 054 ):;issue: 001::page 94
    Author:
    Dou, Jingjing
    ,
    Wang, Yingchun
    ,
    Bornstein, Robert
    ,
    Miao, Shiguang
    DOI: 10.1175/JAMC-D-13-0355.1
    Publisher: American Meteorological Society
    Abstract: his study investigates interactive effects from the Beijing urban area on temperature, humidity, wind speed and direction, and precipitation by use of hourly automatic weather station data from June to August 2008?12. Results show the Beijing summer urban heat island (UHI) as a multicenter distribution (corresponding to underlying land-use features), with stronger nighttime than daytime values (averages of 1.7° vs 0.8°C, respectively). Specific humidity was lower in urban Beijing than in surrounding nonurban areas, and this urban dry island is stronger during day than night (maximum of ?2.4 vs ?1.9 g kg?1). Wind direction is affected by both a mountain?valley-breeze circulation and by urbanization. Morning low-level flows converged into the strong UHI, but afternoon and evening southerly winds were bifurcated by an urban building-barrier-induced divergence. Summer thunderstorms also thus bifurcated and bypassed the urban center because of the building-barrier effect during both daytime and nighttime weak-UHI (<1.25°C) periods. This produced a regional-normalized rainfall (NR) minimum in the urban center and directly downwind of the urban area (of up to ?35%), with maximum values along its downwind lateral edges (of >15%). Strong UHIs (>1.25°C), however, induced or enhanced thunderstorm formation (again day and night), which produced an NR maximum in the most urbanized area of up to 75%.
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      Observed Spatial Characteristics of Beijing Urban Climate Impacts on Summer Thunderstorms

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4217258
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    contributor authorDou, Jingjing
    contributor authorWang, Yingchun
    contributor authorBornstein, Robert
    contributor authorMiao, Shiguang
    date accessioned2017-06-09T16:50:03Z
    date available2017-06-09T16:50:03Z
    date copyright2015/01/01
    date issued2014
    identifier issn1558-8424
    identifier otherams-74974.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4217258
    description abstracthis study investigates interactive effects from the Beijing urban area on temperature, humidity, wind speed and direction, and precipitation by use of hourly automatic weather station data from June to August 2008?12. Results show the Beijing summer urban heat island (UHI) as a multicenter distribution (corresponding to underlying land-use features), with stronger nighttime than daytime values (averages of 1.7° vs 0.8°C, respectively). Specific humidity was lower in urban Beijing than in surrounding nonurban areas, and this urban dry island is stronger during day than night (maximum of ?2.4 vs ?1.9 g kg?1). Wind direction is affected by both a mountain?valley-breeze circulation and by urbanization. Morning low-level flows converged into the strong UHI, but afternoon and evening southerly winds were bifurcated by an urban building-barrier-induced divergence. Summer thunderstorms also thus bifurcated and bypassed the urban center because of the building-barrier effect during both daytime and nighttime weak-UHI (<1.25°C) periods. This produced a regional-normalized rainfall (NR) minimum in the urban center and directly downwind of the urban area (of up to ?35%), with maximum values along its downwind lateral edges (of >15%). Strong UHIs (>1.25°C), however, induced or enhanced thunderstorm formation (again day and night), which produced an NR maximum in the most urbanized area of up to 75%.
    publisherAmerican Meteorological Society
    titleObserved Spatial Characteristics of Beijing Urban Climate Impacts on Summer Thunderstorms
    typeJournal Paper
    journal volume54
    journal issue1
    journal titleJournal of Applied Meteorology and Climatology
    identifier doi10.1175/JAMC-D-13-0355.1
    journal fristpage94
    journal lastpage105
    treeJournal of Applied Meteorology and Climatology:;2014:;volume( 054 ):;issue: 001
    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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