A contribution of brown carbon aerosol to the aerosol light absorption and its radiative forcing in East Asia
- A contribution of brown carbon aerosol to the aerosol light absorption and its radiative forcing in East Asia
- 박록진; 김민중; 정재인; 윤대옥; 김상우
- Chemical transport model; Black carbon aerosol; Brown carbon aerosol; Radiative forcing; East Asia; Regional climate
- Issue Date
- Atmospheric environment
- VOL 44, NO 11, 1414-1421
- 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.
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