%0 Journal Article
%T A Comparison of the Mineral Dust Absorptive Properties between Two Asian Dust Events
%A Timothy Logan
%A Baike Xi
%A Xiquan Dong
%J Atmosphere
%D 2013
%I MDPI AG
%R 10.3390/atmos4010001
%X Asian dust events are generated by deep convection from strong low pressure systems that form over mineral dust source regions. This study compares the mineral dust optical properties of two strong Asian dust events from the winter (December 2007) and spring (March 2010) seasons using AERONET retrieved parameters from three sites along the dust event path: SACOL (dust source region), Xianghe (downwind mixed aerosol region), and Taihu (downwind pollution region). The parameters include: aerosol effective radius, optical depth ( t), absorptive optical depth ( t abs), their respective wavelength dependences or Angstrom exponents ( a and a abs), and the spectral single scattering albedo ( w o( ¦Ë)). The a 440¨C870 values in both cases do not exceed 0.62 indicating coarse mode particle dominance at all three sites. The winter case is shown to have carbonaceous influences at all three sites as given by a abs440¨C870 between 1.3 and 1.8 with strong spectral t abs absorption. The spring case is more dust dominant with a abs440¨C870 of 1.7¨C2.5 (noting that the largest value occurred at Taihu) with strong t abs absorption primarily in the visible wavelengths. Comparison studies between the observed and theoretically calculated w o( ¦Ë) for the winter and spring cases have shown an excellent agreement except for the winter case at Taihu due to pollution influences. The comparison studies also suggest that w o( ¦Ë) is more sensitive to particle absorptive properties rather than particle size. The sharp increase in the aerosol radiative effect (ARE) during the dust events with ARE BOA > ARE TOA suggests a stronger aerosol cooling effect at the surface than at the TOA.
%K mineral dust
%K Asian dust events
%K aerosol absorptive properties
%U http://www.mdpi.com/2073-4433/4/1/1