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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 108, NO. D23,
8636,
doi:10.1029/2002JD003252,
2003
Analysis of surface black carbon distributions during ACE-Asia using a regional-scale aerosol model
Itsushi Uno
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan
Gregory R. Carmichael
Center for Global and Regional Environmental Research, University of Iowa, Iowa City, Iowa, USA
David Streets
Decision and Information Science Division, Argonne National Laboratory, Argonne, Illinois, USA
Shinsuke Satake
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan
Toshihiko Takemura
Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan
Jung-Hun Woo
Center for Global and Regional Environmental Research, University of Iowa, Iowa City, Iowa, USA
Mitsuo Uematsu
Ocean Research Institute, University of Tokyo, Tokyo, Japan
Sachio Ohta
Faculty of Engineering, Hokkaido University, Sapporo, Japan
Abstract
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.
Received 30
November
2002;
accepted 24
March
2003;
published 23
August
2003.
Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801); 0322 Atmospheric Composition and Structure: Constituent sources and sinks; 0345 Atmospheric Composition and Structure: Pollution—urban and regional (0305); 0365 Atmospheric Composition and Structure: Troposphere—composition and chemistry; 3337 Meteorology and Atmospheric Dynamics: Numerical modeling and data assimilation.
Read Full Article (file size: 1402132 bytes) Cited by
Citation: Uno, I., G. R. Carmichael, D. Streets, S. Satake, T. Takemura, J. 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(D23),
8636,
doi:10.1029/2002JD003252.
Copyright 2003 by the American Geophysical Union.
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