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( λ)). The a 440–870 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 abs440–870 between 1.3 and 1.8 with strong spectral t abs absorption. The spring case is more dust dominant with a abs440–870 of 1.7–2.5 (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( λ) 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( λ) 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.
References
[1]
Li, Z.; Chen, H.; Cribb, M.; Dickerson, R.; Holben, B.; Li, C.; Lu, D.; Luo, Y.; Maring, H.; Shi, G.; Tsay, S.-C.; Wang, P.; Wang, Y.; Xia, X.; Zheng, Y.; Yuan, T.; Zhao, F. Aerosol optical properties and its radiative effects in northern China. J. Geophys. Res. 2007, 112, doi:10.1029/2006JD007382.
[2]
Li, Z.; Chen, H.; Cribb, M.; Dickerson, R.; Holben, B.; Li, C.; Lu, D.; Luo, Y.; Maring, H.; Shi, G. Preface to special section on East Asian studies of tropospheric aerosols: An international regional experiment (EAST-AIRE). J. Geophys. Res. 2007, 112, doi:10.1029/2007JD008853.
[3]
Tsunematsu, N.; Kai, K.; Matsumoto, T. The influence of synoptic-scale air flow and local circulation on the dust layer height in the north of the Taklimakan Desert. Water Air Soil Pollut. Focus 2005, 5, 175–193.
[4]
Logan, T.; Xi, B.; Dong, X.; Obrecht, R.; Li, Z.; Cribb, M. A study of Asian dust plumes using satellite, surface, and aircraft measurements during the INTEX-B field experiment. J. Geophys. Res. 2010, 115, doi:10.1029/2010JD014134.
[5]
Uematsu, M.; Duce, R.A.; Prospero, J.M.; Chen, L.; Merrill, J.T.; McDonald, R.L. Transport of mineral aerosol from Asia over the North Pacific Ocean. J. Geophys. Res. 1983, 88, 5343–5352.
[6]
Jordan, C.E.; Dibb, J.E.; Anderson, B.E.; Fuelberg, H.E. Uptake of nitrate and sulfate on dust aerosols during TRACE-P. J. Geophys. Res. 2003, 108, doi:10.1029/2002JD003101.
[7]
Ling, X.-L.; Guo, W.-D.; Zhao, Q.-F.; Zhang, B.D. A case study of a typical dust storm event over the Loess Plateau of Northwest China. Atmos. Oceanic Sci. Lett. 2011, 4, 344–348.
[8]
Sun, Y.; Zhuang, G.; Wang, Y.; Zhao, X.; Li, J.; Wang, Z.; An, Z. Chemical composition of dust storms in Beijing and implications for the mixing of mineral aerosol with pollution aerosol on the pathway. J. Geophys. Res. 2005, 110, doi:10.1029/2005JD006054.
[9]
Yao, X.; Chan, C.K.; Fang, M.; Cadle, S.; Chan, T.; Mulawa, P.; He, K.; Boming, Y. The water-soluble ionic composition of PM2.5 in Shanghai and Beijing, China. Atmos. Environ. 2002, 36, 4223–4234, doi:10.1016/S1352-2310(02)00342-4.
[10]
Logan, T.; Xi, B.; Dong, X.; Li, Z.; Cribb, M. Classification and investigation of Asian aerosol properties. Atmos. Chem. Phys. Discuss. 2012, 12, 18,927–18,958.
[11]
Rosenfeld, D.; Lohmann, U.; Raga, G.B.; O’Dowd, C.D.; Kulmala, M.; Fuzzi, S.; Reissell, A.; Andreae, M.O. Flood or drought: How do aerosols affect precipitation? Science 2008, 321, doi:10.1126/science.1160606.
[12]
Li, Z.; Niu, F.; Fan, J.; Liu, Y.; Rosenfeld, D.; Ding, Y. Long-term impacts of aerosols on the vertical development of clouds and precipitation. Nat. Geosci. 2011, 4, 888–894.
[13]
Qiu, Y.; Dong, X.; Xi, B.; Wang, Z. Effects of clouds and aerosols on surface radiation budget inferred from DOE AMF at Shouxian, China. Atmos. Ocean. Sci. Lett. 2013, 6, 1–5.
[14]
Ge, J.M.; Su, J.; Ackerman, T.P.; Fu, Q.; Huang, J.P.; Shi, J.S. Dust aerosol optical properties retrieval and radiative forcing over northwestern China during the China-U.S. joint field experiment. J. Geophys. Res. 2010, 115, doi:10.1029/2009JD013263.
Pope, C.A. Air pollution and health—Good news and bad. N. Engl. J. Med. 2004, 351, 1132–1134.
[17]
Wang, X.; Huang, J.; Zhang, R.; Chen, B.; Bi, J. Surface measurements of aerosol properties over northwest China during ARM China 2008 deployment. J. Geophys. Res. 2010, 115, doi:10.1029/2009JD013467.
[18]
Xin, J.; Wang, Y.; Li, Z.; Wang, P.; Hao, W.M.; Nordgren, B.L.; Wang, S.; Liu, G.; Wang, L.; Wen, T.; Sun, Y.; Hu, B. Aerosol optical depth (AOD) and Angstrom exponent of aerosols observed by the Chinese Sun Hazemeter Network from August 2004 to September 2005. J. Geophys. Res. 2007, 112, doi:10.1029/2006JD007075.
[19]
Eck, T.F.; Holben, B.N.; Dubovik, O.; Smirnov, A.; Goloub, P.; Chen, H.B.; Chatenet, B.; Gomes, L.; Zhang, X.-Y.; Tsay, S.-C.; Ji, Q.; Giles, D.; Slutsker, I. Columnar aerosol optical properties at AERONET sites in central eastern Asia and aerosol transport to the tropical mid-Pacific. J. Geophys. Res. 2005, 110, doi:10.1029/2004JD005274.
[20]
Yi, B.; Hsu, C.N.; Yang, P.; Tsay, S.-C. Radiative transfer simulation of dust-like aerosols: Uncertainties from particle shape and refractive index. J. Aer. Sci. 2011, 42, 631–644, doi:10.1016/j.jaerosci.2011.06.008.
[21]
Wang, Y.; Xin, J.; Li, Z.; Wang, S.; Wang, P.; Hao, W.M.; Nordgren, B.L.; Chen, H.; Wang, L.; Sun, Y. Seasonal variations in aerosol optical properties over China. J. Geophys. Res. 2011, 116, doi:10.1029/2010JD015376.
[22]
Meng, Z.; Yang, P.; Kattawar, G.W.; Bi, L.; Liou, K.N.; Laszlo, I. Single-scattering properties of tri-axial ellipsoidal mineral dust aerosols: A database for application to radiative transfer calculations. J. Aer. Sci. 2010, 41, 501–512, doi:10.1016/j.jaerosci.2010.02.008.
Holben, B.N.; Eck, T.F.; Slutsker, I.; Smirnov, A.; Sinyuk, A.; Schafer, A.J.; Giles, D.; Dubovik, O. AERONET’s version 2.0 quality assurance criteria, remote sensing of atmosphere and clouds. Proc. SPIE. 2006, 6408, doi:10.1117/12.706524.
[25]
Dubovik, O.; King, M. A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radiance measurements. J. Geophys. Res. 2000, 105, 20673–20696, doi:10.1029/2000JD900282.
[26]
Dubovik, O.; Smirnov, A.; Holben, B.N.; Eck, T.F.; King, M.D.; Kaufman, Y.J.; Slutsker, I. Accuracy assessments of aerosol optical properties retrieved from Aerosol Robotic Network (AERONET) Sun and sky radiance measurements. J. Geophys. Res. 2000, 105, 9791–9806.
[27]
Ackerman, P.; Toon, O.B. Absorption of visible radiation in atmosphere containing mixtures of absorbing and nonabsorbing particles. Appl. Opt. 1981, 20, 3661–3668, doi:10.1364/AO.20.003661.
[28]
Dubovik, O.; Sinyuk, A.; Lapyonok, T.; Holben, B.N.; Mishchenko, M.; Yang, P.; Eck, T.F.; Volten, H.; Munoz, O.; Veihelmann, B.; et al. Application of spheroid models to account for aerosol particle nonsphericity in remote sensing of desert dust. J. Geophys. Res. 2006, 111, doi:10.1029/2005JD006619.
[29]
Sun, J.; Zhang, M.; Liu, T. Spatial and temporal characteristics of dust storms in China and its surrounding regions, 1960？1999: Relations to source area and climate. J. Geophys. Res. 2001, 106, 10325–10333.
[30]
NOAA/ESRL Physical Sciences Division, Boulder Colorado. 2012. Available online: www.esrl.noaa.gov/psd/ (accessed on 8 October 2012).
[31]
Kalnay, E.; Kanamitsu, M.; Kistler, R.; Collins, W.; Deaven, D.; Gandin, L.; Iredell, M.; Saha, S.; White, G.; Woollen, J.; et al. The NCEP/NCAR reanalysis 40-year project. Bull. Amer. Meteor. Soc. 1996, 77, 437–471, doi:10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2.
[32]
Yang, M.; Howell, S.G.; Zhuang, J.; Huebert, B.J. Attribution of aerosol light absorption to black carbon, brown carbon, and dust in China—Interpretations of atmospheric measurements during EAST-AIRE. Atmos. Chem. Phys. 2009, 9, 2035–2050, doi:10.5194/acp-9-2035-2009.
