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    Tibetan Plateau Impacts on Global Dust Transport in the Upper Troposphere

    Source: Journal of Climate:;2018:;volume 031:;issue 012::page 4745
    Author:
    Xu, Chao
    ,
    Ma, Yaoming
    ,
    Yang, Kun
    ,
    You, Chao
    DOI: 10.1175/JCLI-D-17-0313.1
    Publisher: American Meteorological Society
    Abstract: Abstract Dust is a major component of atmospheric aerosol worldwide, greatly affecting regional and global climate. In this study dust aerosol optical depth (DAOD) and dust mass fluxes (DMF) were evaluated at different altitudes using measurements by the Cloud?Aerosol Lidar with Orthogonal Polarization (CALIOP) and ERA-Interim data from March through May (MAM) for the period 2007?16. Significantly higher upper-tropospheric (above ~8 km) dust loads and DMF downstream of the Tibetan Plateau (TP) relative to those over other major dust sources of the Northern Hemisphere were found during spring. A DMF magnitude of 1010 g integrated across a 2°-latitude segment during spring was estimated downstream of the TP in the upper troposphere. A dust belt can be clearly seen at altitudes higher than 6 km over the downwind direction of the TP at latitudes of around 30°?40°N, crossing the Pacific Ocean and extending to North America during spring. A pathway for transporting dust aerosols into the upper troposphere is proposed, as follows. Dust is uplifted to the midtroposphere over the source regions; then, frequent, deep, dry convection prevailing over the TP during spring can cause convective overshooting that uplifts the dust aerosols to the upper troposphere. The TP thus acts as a channel for transporting dust from the lower atmosphere to the upper troposphere, enabling the long-range zonal transport of dust around the Northern Hemisphere.
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      Tibetan Plateau Impacts on Global Dust Transport in the Upper Troposphere

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    contributor authorXu, Chao
    contributor authorMa, Yaoming
    contributor authorYang, Kun
    contributor authorYou, Chao
    date accessioned2019-09-19T10:08:57Z
    date available2019-09-19T10:08:57Z
    date copyright3/23/2018 12:00:00 AM
    date issued2018
    identifier otherjcli-d-17-0313.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4262083
    description abstractAbstract Dust is a major component of atmospheric aerosol worldwide, greatly affecting regional and global climate. In this study dust aerosol optical depth (DAOD) and dust mass fluxes (DMF) were evaluated at different altitudes using measurements by the Cloud?Aerosol Lidar with Orthogonal Polarization (CALIOP) and ERA-Interim data from March through May (MAM) for the period 2007?16. Significantly higher upper-tropospheric (above ~8 km) dust loads and DMF downstream of the Tibetan Plateau (TP) relative to those over other major dust sources of the Northern Hemisphere were found during spring. A DMF magnitude of 1010 g integrated across a 2°-latitude segment during spring was estimated downstream of the TP in the upper troposphere. A dust belt can be clearly seen at altitudes higher than 6 km over the downwind direction of the TP at latitudes of around 30°?40°N, crossing the Pacific Ocean and extending to North America during spring. A pathway for transporting dust aerosols into the upper troposphere is proposed, as follows. Dust is uplifted to the midtroposphere over the source regions; then, frequent, deep, dry convection prevailing over the TP during spring can cause convective overshooting that uplifts the dust aerosols to the upper troposphere. The TP thus acts as a channel for transporting dust from the lower atmosphere to the upper troposphere, enabling the long-range zonal transport of dust around the Northern Hemisphere.
    publisherAmerican Meteorological Society
    titleTibetan Plateau Impacts on Global Dust Transport in the Upper Troposphere
    typeJournal Paper
    journal volume31
    journal issue12
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-17-0313.1
    journal fristpage4745
    journal lastpage4756
    treeJournal of Climate:;2018:;volume 031:;issue 012
    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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