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

Itsushi Uno; Gregory R Carmichael; David Streets; Shinsuke Satake; Toshihiko Takemura; Jung‐Hun Woo; Mitsuo Uematsu; Sachio Ohta

doi:10.1029/2002JD003252

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

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

Itsushi Uno, Gregory R Carmichael, David Streets, Shinsuke Satake, Toshihiko Takemura, Jung‐Hun Woo, Mitsuo Uematsu and Sachio Ohta

Journal of Geophysical Research: Atmospheres, Vol.108(D23), pp.8636-n/a

12/16/2003

DOI: 10.1029/2002JD003252

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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.

transport flux

ACE‐Asia

chemical transport model

CFORS

black carbon

observation

Details

Title: Subtitle: Analysis of surface black carbon distributions during ACE‐Asia using a regional‐scale aerosol model
Creators: Itsushi Uno - Kyushu University
Gregory R Carmichael - University of Iowa
David Streets - Argonne National Laboratory
Shinsuke Satake - Kyushu University
Toshihiko Takemura - Kyushu University
Jung‐Hun Woo - University of Iowa
Mitsuo Uematsu - University of Tokyo
Sachio Ohta - Hokkaido University
Resource Type: Journal article
Publication Details: Journal of Geophysical Research: Atmospheres, Vol.108(D23), pp.8636-n/a
DOI: 10.1029/2002JD003252
ISSN: 0148-0227
eISSN: 2156-2202
Number of pages: 11
Language: English
Date published: 12/16/2003
Academic Unit: Civil and Environmental Engineering; Nursing; Chemical and Biochemical Engineering
Record Identifier: 9984003901802771

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