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    Impact of Chinese Urbanization and Aerosol Emissions on the East Asian Summer Monsoon

    Source: Journal of Climate:;2016:;volume( 030 ):;issue: 003::page 1019
    Author:
    Jiang, Zhihong;Huo, Fei;Ma, Hongyun;Song, Jie;Dai, Aiguo
    DOI: 10.1175/JCLI-D-15-0593.1
    Publisher: American Meteorological Society
    Abstract: AbstractImpacts of urbanization and anthropogenic aerosols in China on the East Asian summer monsoon (EASM) are investigated using version 5.1 of the Community Atmosphere Model (CAM5.1) by comparing simulations with and without incorporating urban land cover and/or anthropogenic aerosol emissions. Results show that the increase of urban land cover causes large surface warming and an urban frictional drag, both leading to a northeasterly wind anomaly in the lower troposphere over eastern China (EC). This weakens the southerly winds associated with the EASM and causes a convergence anomaly in southern China (SC) with increased ascent, latent heating, and cloudiness. The enhanced latent heating reinforces surface convergence and upper-level divergence over SC, leading to more northward advection in the upper level into northern China (NC) and descending between 30° and 50°N over East Asia. Cloudiness reduction, adiabatic heating, and warm advection over NC all enhance the urban heating there, together causing anomalous tropospheric warming at those latitudes over East Asia. Anthropogenic aerosols cause widespread cooling at the surface and in the troposphere over EC, which decreases the summer land?ocean thermal contrast, leading to a weakened EASM circulation with reduced moisture transport to NC. This results in wetter and drier conditions over SC and NC, respectively. When both the urbanization and anthropogenic aerosols are included in the model, aerosols? cooling is partially offset by the urban heating, and their joint effect on the circulation is dominated by the aerosols? effect with a reduced magnitude. In the combined experiment, surface and tropospheric temperatures are also altered by the decrease (increase) in cloudiness over NC (SC) with most of the cooling confined to SC, which further weakens the EASM circulation.
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      Impact of Chinese Urbanization and Aerosol Emissions on the East Asian Summer Monsoon

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    contributor authorJiang, Zhihong;Huo, Fei;Ma, Hongyun;Song, Jie;Dai, Aiguo
    date accessioned2018-01-03T11:00:03Z
    date available2018-01-03T11:00:03Z
    date copyright11/2/2016 12:00:00 AM
    date issued2016
    identifier otherjcli-d-15-0593.1.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4245871
    description abstractAbstractImpacts of urbanization and anthropogenic aerosols in China on the East Asian summer monsoon (EASM) are investigated using version 5.1 of the Community Atmosphere Model (CAM5.1) by comparing simulations with and without incorporating urban land cover and/or anthropogenic aerosol emissions. Results show that the increase of urban land cover causes large surface warming and an urban frictional drag, both leading to a northeasterly wind anomaly in the lower troposphere over eastern China (EC). This weakens the southerly winds associated with the EASM and causes a convergence anomaly in southern China (SC) with increased ascent, latent heating, and cloudiness. The enhanced latent heating reinforces surface convergence and upper-level divergence over SC, leading to more northward advection in the upper level into northern China (NC) and descending between 30° and 50°N over East Asia. Cloudiness reduction, adiabatic heating, and warm advection over NC all enhance the urban heating there, together causing anomalous tropospheric warming at those latitudes over East Asia. Anthropogenic aerosols cause widespread cooling at the surface and in the troposphere over EC, which decreases the summer land?ocean thermal contrast, leading to a weakened EASM circulation with reduced moisture transport to NC. This results in wetter and drier conditions over SC and NC, respectively. When both the urbanization and anthropogenic aerosols are included in the model, aerosols? cooling is partially offset by the urban heating, and their joint effect on the circulation is dominated by the aerosols? effect with a reduced magnitude. In the combined experiment, surface and tropospheric temperatures are also altered by the decrease (increase) in cloudiness over NC (SC) with most of the cooling confined to SC, which further weakens the EASM circulation.
    publisherAmerican Meteorological Society
    titleImpact of Chinese Urbanization and Aerosol Emissions on the East Asian Summer Monsoon
    typeJournal Paper
    journal volume30
    journal issue3
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-15-0593.1
    journal fristpage1019
    journal lastpage1039
    treeJournal of Climate:;2016:;volume( 030 ):;issue: 003
    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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