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    Transport of black carbon to polar regions: Sensitivity and forcing by black carbon

    189307_72135_Transport_of_black_carbon_to_polar_regions-Sensitivity_and_forcing_by_black_carbon.pdf (519.4Kb)
    Access Status
    Open access
    Authors
    Zhou, C.
    Penner, J.
    Flanner, M.
    Bisiaux, M.
    Edwards, Ross
    McConnell, J.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Zhou, Cheng and Penner, Joyce E. and Flanner, Mark G. and Bisiaux, Marion M. and Edwards, Ross and McConnell, Joseph R. 2012. Transport of black carbon to polar regions: Sensitivity and forcing by black carbon. Geophysical Research Letters. 39 (2): pp. L22804.
    Source Title
    Geophysical Research Letters
    DOI
    10.1029/2012GL053388
    ISSN
    0094-8276
    Remarks

    An edited version of this paper was published by AGU. Copyright 2012 American Geophysical Union.

    URI
    http://hdl.handle.net/20.500.11937/18626
    Collection
    • Curtin Research Publications
    Abstract

    The transport of black carbon (BC) to polar regions is studied using the University of Michigan IMPACT aerosol model driven by two sets of meteorological fields from the NCAR CAM5 and GFDL AM3 models. The sensitivity of the transport of BC to wet deposition processes is tested by varying the wet deposition in large-scale precipitation. BC concentrations and deposition in polar regions are shown to be sensitive to both the meteorological fields and the wet deposition treatment. Using the default wet deposition, both IMPACT-CAM5 and IMPACT-AM3 simulate an appropriate amount of BC deposition in polar regions as compared to ice core observations. Although the seasonal cycle of BC surface air concentrations is reasonable, the concentrations are about 1~2 orders of magnitude smaller than observations. With reduced wet deposition efficiency, the total deposition of BC increases by a factor of ~2 to ~3 due to more transport to the poles. The near surface BC concentrations increase even more (by a factor of ~3 to ~10) but are still largely underestimated especially in the north polar region. The radiative forcing from the BC deposited on snow and sea ice is also sensitive to the wet deposition treatment and the different meteorological fields. The global (Arctic) annual mean forcing is about +0.020 W m−2 (+0.11 W m−2) for IMPACT-CAM5 and +0.022 W m−2 (+0.13W m−2) for IMPACT-AM3.

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