Data Summary

Seasonal Variation of Wet Deposition of Black Carbon in Arctic Alaska

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    Summary

  • Black carbon (BC) aerosol deposited in and onto Arctic snow increases the snow's absorption of sunlight and accelerates snowmelt. Wet removal of BC from the atmosphere plays a key role in determining its abundance in the Arctic atmosphere and in Arctic snow. However, this process is poorly understood, mainly due to the scarcity of relevant measurements. To reveal characteristic features of the wet deposition of BC, we made measurements of mass concentration of BC in snow and rain (C_MBC) with relatively high (16%) accuracy and mass concentration of BC in air (M_BC) at the Barrow Atmospheric Baseline Observatory, Alaska, from July 2013 to August 2017 and analyzed them along with routinely measured meteorological parameters from Barrow. Monthly mean M_BC near the surface and C_MBC were poorly correlated from midwinter to early spring, when C_MBC was close to the annual median while M_BC was at its annual peak. Seasonal variations in the altitude distribution of M_BC may lead to these differences in seasonal variation of M_BC near the surface and C_MBC. About 50% of the annual wet deposition of BC occurred in the three months of summer, associated with high values of total precipitation and BC originating from biomass burning. Size distributions of BC in snow and rain were stable throughout the year, suggesting that the size distribution of BC in the lower troposphere was similarly stable. Calculations by two global models reproduced the observed seasonal variations of C_MBC and showed that BC from biomass burning dominated C_MBC in summer.

    Dataset citation

  • Mori, T., Y. Kondo, S. Ohata, S. Ohata, Y. Zhao, P. Sinha, N. Oshima, H. Matsui, N. Moteki, M. Koike, 2019, Seasonal Variation of Wet Deposition of Black Carbon in Arctic Alaska, 1.00, Arctic Data archive System (ADS), Japan, https://ads.nipr.ac.jp/dataset/A20191211-001

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    Spatial coverage

  • N:  71.3°   S:  71.3°   E:  -156.6°   W:  -156.6°  

    Temporal coverage

  • 2013-07-01   -   2017-08-31

    License

  •  CC BY 4.0

DATA CONTORIBUTOR & GROUP

  • Tatsuhiro Mori
    (Department of Physics, Faculty of Science Division I, Tokyo University of Science)
  • Yutaka Kondo
    (National Institute of Polar Research)
  • Sho Ohata
    (Institute for Space-Earth Environmental Research, Nagoya University)
  • Sho Ohata
    (Institute for Advanced Research, Nagoya University)
  • Yongjing Zhao
    (Air Quality Research Center, University of California-Davis)
  • Puna Sinha
    (Department of Earth and Space Sciences, Indian Institute of Space Science and Technology)
  • Naga Oshima
    (Meteorological Research Institute)
  • Hitoshi Matsui
    (Graduate School of Environmental Studies, Nagoya University)
  • Nobuhiro Moteki
    (Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo)
  • Makoto Koike
    (Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo)

PARAMETERS

  • CARBONACEOUS AEROSOLS
  • TROPOSPHERIC/LOW LEVEL CLOUDS (OBSERVED/ANALYZED)
  • PRECIPITATION AMOUNT
  • WATER VAPOR PROFILES
  • SNOW/ICE CHEMISTRY

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