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Aerosol direct shortwave radiative forcing effect based on SBDART model in the Pearl River Delta, Guangdong (China)
by Lili Li; Yunpeng Wang
International Journal of Global Warming (IJGW), Vol. 13, No. 1, 2017

 

Abstract: Aerosols play an important role in the energy budget of the earth-atmosphere system. In this paper, we studied aerosol shortwave direct radiative forcing (DRF) effects in Pearl River Delta based on SBDART and a 'two-layer-single-wavelength' model. Simulation results indicated that the underlying surface type and solar zenith angle have significant impacts on aerosol radiative forcing. The comparison between aerosol radiative forcing effects on urban asphalt surface and vegetation shows cooling and warming effects of aerosol shortwave radiative forcing on urban asphalt are much more apparent than that on vegetation, implying aerosols over asphalt-predominated cities will impact the local climate. Then we estimated variations of average DRF and net radiation flux with solar zenith angle in the Pearl River Delta. DRF indicates warming at solar zenith angles of 0°, 20°, 40° and 60°, but cooling at 80°. Net radiation flux increases with a decrease in aerosol optical thickness (AOT) at low elevation, but with an increase in AOT above 5 km.

Online publication date: Mon, 24-Jul-2017

 

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