A contribution of brown carbon aerosol to the aerosol light absorption and its radiative forcing in East Asia

Title
A contribution of brown carbon aerosol to the aerosol light absorption and its radiative forcing in East Asia
Authors
박록진김민중정재인윤대옥김상우
Keywords
Chemical transport model; Black carbon aerosol; Brown carbon aerosol; Radiative forcing; East Asia; Regional climate
Issue Date
2010-04
Publisher
Atmospheric environment
Citation
VOL 44, NO 11, 1414-1421
Abstract
Brown carbon aerosols were recently found to be ubiquitous and effectively absorb solar radiation. We use a 3-D global chemical transport model (GEOS-Chem) together with aircraft and ground based observations from the TRACE-P and the ACE-Asia campaigns to examine the contribution of brown carbon aerosol to the aerosol light absorption and its climatic implication over East Asia in spring 2001. We estimated brown carbon aerosol concentrations in the model using the mass ratio of brown carbon to black carbon (BC) aerosols based on measurements in China and Europe. The comparison of simulated versus observed aerosol light absorption showed that the model accounting for brown carbon aerosol resulted in a better agreement with the observations in East Asian-Pacific outflow. We then used the model results to compute the radiative forcing of brown carbon, which amounts up to -2.4 W m-2 and 0.24 W m-2 at the surface and at the top of the atmosphere (TOA), respectively, over East Asia. Mean radiative forcing of brown carbon aerosol is -0.43 W m-2 and 0.05 W m-2 at the surface and at the TOA, accounting for about 15% of total radiative forcing (-2.2 W m-2 and 0.33 W m-2) by absorbing aerosols (BC + brown carbon aerosol), having a significant climatic implication in East Asia.
URI
http://pubs.kist.re.kr/handle/201004/37229
ISSN
1352-2310
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