Aerosols and Clouds

Analysis of surface black carbon distributions during ACE-Asia using a regional-scale aerosol model

  1. Itsushi Uno1,
  2. Gregory R. Carmichael2,
  3. David Streets3,
  4. Shinsuke Satake1,
  5. Toshihiko Takemura1,
  6. Jung-Hun Woo2,
  7. Mitsuo Uematsu4,
  8. Sachio Ohta5

Article first published online: 23 AUG 2003

DOI: 10.1029/2002JD003252

Issue

Journal of Geophysical Research: Atmospheres (1984–2012)

Journal of Geophysical Research: Atmospheres (1984–2012)

Volume 108, Issue D23, 16 December 2003

Additional Information

How to Cite

Uno, I., G. R. Carmichael, D. Streets, S. Satake, T. Takemura, J.-H. Woo, M. Uematsu, and S. Ohta (2003), Analysis of surface black carbon distributions during ACE-Asia using a regional-scale aerosol model, J. Geophys. Res., 108, 8636, doi:10.1029/2002JD003252, D23.

Author Information

  1. 1

    Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan

  2. 2

    Center for Global and Regional Environmental Research, University of Iowa, Iowa City, Iowa, USA

  3. 3

    Decision and Information Science Division, Argonne National Laboratory, Argonne, Illinois, USA

  4. 4

    Ocean Research Institute, University of Tokyo, Tokyo, Japan

  5. 5

    Faculty of Engineering, Hokkaido University, Sapporo, Japan

Publication History

  1. Issue published online: 23 AUG 2003
  2. Article first published online: 23 AUG 2003
  3. Manuscript Accepted: 24 MAR 2003
  4. Manuscript Revised: 13 FEB 2003
  5. Manuscript Received: 30 NOV 2002

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Keywords:

  • black carbon;
  • ACE-Asia;
  • chemical transport model;
  • observation;
  • transport flux;
  • CFORS

[1] The regional-scale aerosol transport model (CFORS) is used in the analysis of black carbon (BC) observed at five remote Japanese islands during the ACE-Asia experiment. BC is modeled online in the regional-scale meteorological model, using emissions estimates for 2000. Two model experiments are conducted (1) a control run that includes all the BC emission, and (2) a sensitivity run without open biomass burning emissions to clarify the impact of biomass burning on the BC levels in the western Pacific. The regional aerosol model (CFORS) is shown to accurately reproduce many of the important features observed. Model analysis shows that the spatial and temporal distributions of black carbon between the northern sites (Rishiri and Sado; located in the Japan Sea) and the southern stations (Hachijo, Chichijima, and Amami-Oshima; in the western Pacific Ocean) are under different flow regimes. It is shown that the major synoptic features controlling BC levels are associated with outflow in the warm conveyor belt of traveling cold fronts and the subsequent postfrontal transport. At the northern stations (Rishiri and Sado), elevated BC concentrations are calculated to be mainly below the heights of 2000 m, and the biomass burning fraction is estimated to be below 20%. At the southern sites (e.g., Chichijima) the contribution due to biomass burning reaches 32% at the surface and 52% in the free atmosphere. CFORS results indicate that the major black carbon source and transport height are different between the northern and southern sites.

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