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Abstract
A coupled regional climate and aerosol-chemistry model, RIEMS 2.0 (Regional Integrated Environmental
Model System for Asia), in which anthropogenic sulfate, black carbon, and organic carbon were assumed to be
externally mixed (EM), internally mixed (IM) or partially internally mixed (IEM), was used to simulate the
impacts of these anthropogenic aerosols on East Asian climate for the entire year of 2006. The distributions
of aerosol mass concentration, radiative forcing and hence the surface air temperature and precipitation
variations under three mixing assumptions of aerosols were analyzed. The results indicated that the mass
concentration of sulfate was sensitive to mixing assumptions, but carbonaceous aerosols were much less
sensitive to the mixing types. Modeled results were compared with observations in a variety of sites in East
Asia. It was found that the simulated concentrations of sulfate and carbonaceous aerosols were in accord
with the observations in terms of magnitude. The simulated aerosol concentrations in IM case were closest
to observation results. The regional average column burdens of sulfate, black carbon, and organic carbon,
if internally mixed, were 11.49, 0.47, and 2.17 mg m-2, respectively. The radiative forcing of anthropogenic
aerosols at the top of the atmosphere increased from -1.27 (EM) to -1.97 W m-2 (IM) while the normalized
radiative forcing (NRF) decreased from -0.145 (EM) to -0.139 W mg-1 (IM). The radiative forcing and
NRF were -1.82 W m-2 and -0.141 W mg-1 for IEM, respectively. The surface air temperature changes
over the domain due to the anthropogenic sulfate and carbonaceous aerosols were -0.067, -0.078, and -0.072
K, with maxima of -0.47, -0.50, and -0.49 K, for EM, IM, and IEM, respectively. Meanwhile, the annual
precipitation variations were -8.0 (EM), -20.6 (IM), and -21.9 mm (IEM), with maxima of 148, 122, and 102
mm, respectively, indicating that the climate e?ects were stronger if the sulfate and carbonaceous aerosols
were internally mixed.
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Citation
ZHANG Li, LIU Hongnian, ZHANG Ning. 2011: Impacts of Internally and Externally Mixed Anthropogenic Sulfate and Carbonaceous Aerosols on East Asian Climate. Journal of Meteorological Research, 25(5): 639-658.
ZHANG Li, LIU Hongnian, ZHANG Ning. 2011: Impacts of Internally and Externally Mixed Anthropogenic Sulfate and Carbonaceous Aerosols on East Asian Climate. Journal of Meteorological Research, 25(5): 639-658.
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ZHANG Li, LIU Hongnian, ZHANG Ning. 2011: Impacts of Internally and Externally Mixed Anthropogenic Sulfate and Carbonaceous Aerosols on East Asian Climate. Journal of Meteorological Research, 25(5): 639-658.
ZHANG Li, LIU Hongnian, ZHANG Ning. 2011: Impacts of Internally and Externally Mixed Anthropogenic Sulfate and Carbonaceous Aerosols on East Asian Climate. Journal of Meteorological Research, 25(5): 639-658.
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