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The Effect of Hygroscopic Growth on Continental Aerosols

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DOI: 10.4236/ojapps.2013.36048    3,490 Downloads   5,485 Views   Citations

ABSTRACT

In this paper, the authors investigated some microphysical and optical properties of continental clean aerosols from OPAC to determine the effect of hygroscopic growth at the spectral range of 0.25 μm to 2.5 μm and eight relative humidities (RHs) (0%, 50%, 70%, 80%, 90%, 95%, 98% and 99%). The microphysical properties extracted were radii, volume mix ratio, number mix ratio and mass mix ratio as a function of RH while the optical properties are scattering and absorption coefficients and asymmetric parameters. Using the microphysical properties, growth factors of the mixtures were determined while using optical properties the enhancement parameters were determined and then parameterized using some models. We observed that the data fitted the models very well. The angstrom coefficients show that the mixture has bimodal type of distribution with the dominance of fine mode particles.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

B. Tijjani, A. Aliyu and F. Shuaibu, "The Effect of Hygroscopic Growth on Continental Aerosols," Open Journal of Applied Sciences, Vol. 3 No. 6, 2013, pp. 381-392. doi: 10.4236/ojapps.2013.36048.

References

[1] D. A. Randall, R. A. Wood, S. Bony, R. Colman, T. Fichefet, J. Fyfe, V. Kattsov, A. Pitman, J. Shukla, J. Srinivasan, R. J. Stouffer, A. Sumi and K. E. Taylor, “Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change—Climate Models and their Evaluation,” Cambridge University Press, Cambridge, New York, 2007, pp. 589-662.
[2] D. S. Covert, R. J. Charlson and N. C. Ahlquist, “A Study of the Relationship of Chemical Composition and Humidity to Light Scattering by Aerosols,” Journal of Applied Meteorology, Vol. 11, No. 6, 1972, pp. 968-976. http://dx.doi.org/10.1175/1520-0450(1972)011<0968:ASOTRO>2.0.CO;2
[3] L. McInnes, M. Bergin, J. Ogren and S. Schwartz, “Apportionment of Light Scattering and Hygroscopic Growth to Aerosol Composition,” Geophysical Research Letters, Vol. 25, No. 4, 1998, pp. 513-516. http://dx.doi.org/10.1029/98GL00127
[4] R. A. Kotchenruther, P. V. Hobbs and D. A. Hegg, “Humidification Factors for Atmospheric Aerosols off the Mid-Atlantic Coast of the United States,” Journal of Geophysical Research, Vol. 104, No. D2, 1999, pp. 2239-2251. http://dx.doi.org/10.1029/98JD01751
[5] W. C. Malm, D. E. Day, S. M. Kreidenweis, J. L. Collett and T. Lee, “Humidity-Dependent Optical Properties of Fine Particles during the Big Bend Regional Aerosol and Visibility Observational Study,” Journal of Geophysical Research, Vol. 108, No. D9, 2003, p. 4279. http://dx.doi.org/10.1029/2002JD002998
[6] I. N. Tang, “Chemical and Size Effects of Hygroscopic Aerosols on Light Scattering Coefficient,” Journal of Geophysical Research, Vol. 101, No. D14, 1996, pp. 19245-19250. http://dx.doi.org/10.1029/96JD03003
[7] E. Swietlicki, J. Zhou, O. H. Berg, B. G. Martinsson, G. Frank, S.-I. Cederfelt, U. Dusek, A. Berner, W. Birmilli, A. Wiedensohler, B. Yuskiewicz and K. N. Bower, “A Closure Study of Sub-Micrometer Aerosol Particle Hygroscopic Behaviour,” Atmospheric Research, Vol. 50 No. 3-4, 1999, pp. 205-240. http://dx.doi.org/10.1016/S0169-8095(98)00105-7
[8] S. A. Terpugowa, M. V. Panchenko, V. S. Kozlov, V. V. Polkin and E. P. Yausheva, “The Study of the Growth Factor of the Aerosol Scattering Coefficient in the Near-Ground Layer of the Atmosphere in West Siberia,” European Aerosol Conference, Budapest, 2004
[9] J. Kusmierczyk-Michulec, “Angstrom Coefficient as an Indicator of the Atmospheric Aerosol Type for a Well-Mixed Atmospheric Boundary Layer: Part 1: Modeldevelopment,” Oceanologia, Vol. 51 No. 1, 2009, pp. 5-38. http://dx.doi.org/10.5697/oc.51-1.005
[10] M. J Jeong, Z. Li, E. Andrews and S. C. Tsay, “Effect of Aerosol Humidification on the Column Aerosol Optical Thickness over the Atmospheric Radiation Measurement Southern Great Plains Site,” Journal of Geophysical Research, Vol. 112, No. D10, 2007, p. 202. http://dx.doi.org/10.1029/2006JD007176
[11] A. S. Rapti, “Spectral Optical Atmospheric Thickness Dependence on the Specific Humidity in the Presence of Continental and Marine Air Masses,” Atmospheric Research, Vol. 78, No. 1-2, 2005, pp. 13-32. http://dx.doi.org/10.1016/j.atmosres.2005.02.004
[12] Y. Miyazaki, Y. Kondo, N. Takegawa, Y. Komazaki, M. Fukuda, K. Kawamura, M. Mochida, K. Okuzawa and R. J. Weber, “Time-Resolved Measurements of Water-Soluble Organic Carbon in Tokyo,” Journal of Geophysical Research, Vol. 111, No. D23, 2006, p. 206. http://dx.doi.org/10.1029/2006JD007125
[13] A. P. Sullivan, R. E. Peltier, C. A. Brock, J. A. de Gouw, J. S. Holloway, C. Warneke, A. G. Wollny and R. J. Weber, “Airborne Measurements of Carbonaceous Aerosol Soluble in Water over Northeastern United States: Method Development and an Investigation into Water-Soluble Organic Carbon Sources,” Journal of Geophysical Research, Vol. 111, No. D23, 2006, p. S46. http://dx.doi.org/10.1029/2006JD007072
[14] Y. Kondo, Y. Miyazaki, N. Takegawa, T. Miyakawa, R. J. Weber, J. L. Jimenez, Q. Zhang and D. R. Worsnop, “Oxygenated and Water-Soluble Organic Aerosols in Tokyo,” Journal of Geophysical Research, Vol. 122, No. D01, 2007, p. 203. http://dx.doi.org/10.1029/2006JD007056
[15] R. J. Weber, A. P. Sullivan, R. E. Peltier, A. Russell, B. Yan, M. Zheng, J. de Gouw, C. Warneke, C. Brock, J. S. Holloway, E. L. Atlas and E. Edgerton, “A Study of Secondary Organic Aerosol Formation in the Anthropogenic Influenced Southeastern United States,” Journal of Geophysical Research, Vol. 112, No. D13, 2007, p. 302. http://dx.doi.org/10.1029/2007JD008408
[16] B. Ervens and R. Volkamer, “Glyoxal Processing by Aerosol Multiphase Chemistry: Towards a Kinetic Modeling Framework of Secondary Organic Aerosol Formation in Aqueous Particles,” Atmospheric Chemistry and Physics, Vol. 10, 2010, pp. 8219-8244. http://dx.doi.org/10.5194/acp-10-8219-2010
[17] A. Sorooshian, S. M. Murphy, S. Hersey, R. Bahreini, H. Jonsson, R. C. Flagan and J. H. Seinfeld, “Constraining the Contribution of Organic Acids and AMS m/z44 to the Organic Aerosol Budget: On the Importance of Meteorology, Aerosol Hygroscopicity and Region,” Geophysical Research Letters, Vol. 37, No. 21, 2010. http://dx.doi.org/10.1029/2010GL044951
[18] H. Timonen, M. Aurela, S. Carbone, K. Saarnio, S. Saarikoski, T. Makela, M. Kulmala, V. M. Kerminen, D. R. Worsnop and R. Hillamo, “High Time-Resolution Chemical Characterization of the Water-Soluble Fraction of Ambient Aerosols with PILS-TOC-IC and AMS,” Atmospheric Measurement Techniques, Vol. 3, 2010, pp. 1063-1074. http://dx.doi.org/10.5194/amt-3-1063-2010
[19] K. S. Docherty, E. A. Stone, I. M. Ulbrich, P. F. DeCarlo, D. C. Snyder, J. J. Schauer, R. E. Peltier, R. J. Weber, S. M. Murphy, J. H. Seinfeld, D. J. Eatough, B. D. Grover and J. L. Jimenez, “Apportionment of Primary and Secondary Organic Aerosols in Southern California during the 2005 Study of Organic Aerosols in Riverside (SOAR),” Environmental Science & Technology, Vol. 42, No. 20, 2008, pp. 7655-7662.
[20] P. McMurry and M. Stolzenburg, “On the Sensitivity of Particle Size to Relative Humidity for Los Angeles Aerosols,” Atmospheric Environment, Vol. 23, No. 2, 1989, pp. 497-507. http://dx.doi.org/10.1016/0004-6981(89)90593-3
[21] D. Cocker, N. Whitlock, R. Flagan and J. H. Seinfeld, “Hygroscopic Properties of Pasadena, California Aerosol,” Aerosol Science and Technology, Vol. 35, No. 2, 2001, pp. 637-647. http://dx.doi.org/10.1080/02786820120653
[22] E. Swietlicki, et al., “Hygroscopic Properties of Submicrometer Atmospheric Aerosol Particles Measured with H TDMA Instruments in Various Environments—A Review,” Tellus B, Vol. 60, No. 3, 2008, pp. 432-469. http://dx.doi.org/10.3402/tellusb.v60i3.16936
[23] H. Kohler, “The Nucleus and Growth of Hygroscopic Droplets,” Transactions of the Faraday Society, Vol. 32, 1936, pp. 1152-1161. http://dx.doi.org/10.1039/tf9363201152
[24] P. J. Sheridan, D. J. Delene and J. A. Ogren, “Four Years of Continuous Surface Aerosol Measurements from the Department of Energy’s Atmospheric Radiation Measurement Program Southern Great Plains Cloud and Radiation Testbedsite,” Journal of Geophysical Research, Vol. 106, No. 20, 2001, pp. 735-747. http://dx.doi.org/10.1029/2001JD000785
[25] M. Hess, P. Koepke and I. Schult, “Optical Properties of Aerosols and Clouds: The Software Package OPAC,” Bulletin of the American Meteorological Society, Vol. 79, No. 5, 1998, pp. 831-844.
[26] C. A. Randles, L. M. Russell and V. Ramaswamy, “Hygroscopic and Optical Properties of Organic Sea Salt Aerosol and Consequences for Climate Forcing,” Geophysical Research Letters, Vol. 31, No. 16, 2004, Article ID: L16108. http://dx.doi.org/10.1029/2004GL020628
[27] P. F. Liu, C. S. Zhao, T. Gobel, E. Hallbauer, A. Nowak, L. Ran, W. Y. Xu, Z. Z. Deng, N. Ma, K. Mildenberger, S. Henning, F. Stratmann and A. Wiedensohler, “Hygroscopic Proper Ties of Aerosol Particles at High Relative Humidity and Their Diurnal Variations in the North China Plain,” Atmospheric Chemistry and Physics, Vol. 11, 2011, pp. 2991-3040. http://dx.doi.org/10.5194/acpd-11-2991-2011
[28] G. Buzorius, A. Zelenyuk, F. Brechtel and D. Imre, “Simultaneous Determination of Individual Ambient Particle Size, Hygroscopicity and Composition,” Geophysical Research Letters, Vol. 29, 1974, 2002. http://dx.doi.org/10.1029/2001GL014221
[29] S. Sjogren, M. Gysel, E. Weingartner, U. Baltensperger, M. J. Cubison, H. Coe, A. A. Zardini, C. Marcolli, U. K. Krieger and T. Peter, “Hygroscopic Growth and Water Uptake Kinetics of Two-Phase Aerosol Particles Consisting of Ammonium Sulfate, Adipic and Humic Acid Mixtures,” Journal of Aerosol Science, Vol. 38, No. 2, 2007, 157-171. http://dx.doi.org/10.1016/j.jaerosci.2006.11.005
[30] R. H. Stokes and R. A. Robinson, “Interactions in Aqueous Nonelectrolyte Solutions. I. Solute-Solvent Equilibria,” The Journal of Physical Chemistry, Vol. 70, No. 7, 1966, pp. 2126-2130. http://dx.doi.org/10.1021/j100879a010
[31] N. K. Meyer, J. Duplissy, M. Gysel, A. Metzger, J. Dommen, E. Weingartner, M. R. Alfarra, A. S. H. Prevot, C. Fletcher, N. Good, G. McFiggans, A. M. Jonsson, M. Hallquist, U. Baltensperger and Z. D. Ristovski, “Analysis of the Hygroscopic and Volatile Properties of Ammonium Sulphate Seeded and Unseeded SOA Particles,” Atmospheric Chemistry and Physics, Vol. 9, 2009, pp. 721-732. http://dx.doi.org/10.5194/acp-9-721-2009
[32] M. Stock, Y. F. Cheng, W. Birmili, A. Massling, B. Wehner, T. Muller, S. Leinert, N. Kalivitis, N. Mihalopoulos and A. Wiedensohler, “Hygroscopic Properties of Atmospheric Aerosol Particles over the Eastern Mediterranean: Implications for Regional Direct Radiative Forcing under Clean and Polluted Conditions,” Atmospheric Chemistry and Physics, Vol. 11, 2011, pp. 4251-4271. www.atmos-chem-phys.net/11/4251/2011/ http://dx.doi.org/10.5194/acp-11-4251-2011
[33] J. Duplissy, P. F. DeCarlo, J. Dommen, M. R. Alfarra, A. Metzger, I. Barmpadimos, A. S. H. Prevot, E. Weingartner, T. Tritscher, M. Gysel, A. C. Aiken, J. L. Jimenez, M. R. Canagaratna, D. R. Worsnop, D. R. Collins, J. Tomlinson and U. Baltensperger, “Relating Hygroscopicity and Composition of Organic Aerosol Particulate Matter,” Atmospheric Chemistry and Physics, Vol. 11, 2011, pp. 1155-1165. www.atmos-chem-phys.net/11/1155/2011/ http://dx.doi.org/10.5194/acp-11-1155-2011
[34] J. Meier, B. Wehner, A. Massling, W. Birmili, A. Nowak, T. Gnauk, E. Bruggemann, H. Herrmann, H. Min and A. Wiedensohler, “Hygroscopic Growth of Urban Aerosol Particles in Beijing (China) during Wintertime: A Comparison of Three Experimental Methods,” Atmospheric Chemistry and Physics, Vol. 9, 2009, pp. 6865-6880. www.atmos-chem-phys.net/9/6865/2009/ http://dx.doi.org/10.5194/acp-9-6865-2009
[35] M. D. Petters and S. M. Kreidenweis, “A Single Parameter Representation of Hygroscopic Growth and Cloud Condensation Nucleus Activity,” Atmospheric Chemistry and Physics, Vol. 7, No. 8, 2007, pp. 1961-1971. http://dx.doi.org/10.5194/acp-7-1961-2007
[36] J. H. Seinfeld and S. N. Pandis, “Atmospheric Chemistry and Physics,” Wiley-Interscience Publication, Hoboken, 1998.
[37] J. Seinfeld and S. Pandis, “Atmospheric Chemistry and Physics,” 2nd Edition, Wiley-Interscience, New York, 2006.
[38] E. Swietlicki, J. Zhou, D. S. Covert, K. Hameri, B. Busch, M. Vakeva, U. Dusek, O. H. Berg, A. Wiedensohler, P. Aalto, J. Makela, B. G. Martinsson, G. Papaspiropoulos, B. Mentes, G. Frank and F. Stratmann, “Hygroscopic Properties of Aerosol Particles in the Northeastern Atlantic during ACE-2,” Tellus, Vol. 52, No. 2, 2000, pp. 201-227.
[39] W. Birmili, A. Nowak, K. Schwirn, K. Lehmann, et al., “A New Method to Accurately Relate Dry and Humidified Number Size Distributions of Atmospheric Aerosols,” Journal of Aerosol Science, Vol. 1, No. 1, 2004, pp. 15-16.
[40] F. Kasten, “Visibility Forecast in the Phase of Pre-Condensation,” Tellus, Vol. 21, No. 5, 1969, pp. 631-635.
[41] M. Gysel, G. B. McFiggans and H. Coe, “Inversion of Tandem Differential Mobility Analyser (TDMA) Measurements,” Journal of Aerosol Science, Vol. 40, No. 2, 2009, pp. 134-151. http://dx.doi.org/10.1016/j.jaerosci.2008.07.013
[42] J.-P. Putaud, “Interactive Comment on ‘Aerosol Hygroscopicity at Ispra EMEP-GAW Station’ by M. Adam et al.,” Atmospheric Chemistry and Physics Discussions, Vol. 12, No. 1, 2012, pp. C200-C202.
[43] S. I. Christensen and M. D. Petters, “The Role of Temperature in Cloud Droplet Activation,” The Journal of Physical Chemistry A, Vol. 116, No. 39, 2012, pp. 9706-9717. http://dx.doi.org/10.1021/jp3064454
[44] S. J. Doherty, et al., “A Comparison and Summary of Aerosol Optical Properties as Observed in Situ from Aircraft, Ship, and Land during ACE-Asia,” Journal of Geophysical Research: Atmospheres, Vol. 110, No. D4, 2005, Article ID: D04201. http://dx.doi.org/10.1029/2004JD004964
[45] P. K. Quinn, et al., “Impact of Particulate Organic Matter on the Relative Humidity Dependence of Light Scattering: A Simplified Parameterization,” Geophysical Research Letters, Vol. 32, No. 22, 2005, Article ID: L22809. http://dx.doi.org/10.1029/2005GL024322
[46] S. Gasso, et al., “Influence of Humidity on the Aerosol Scattering Coefficient and Its Effect on the Upwelling Radiance during ACE-2,” Tellus B, Vol. 52, No. 2, 2000, pp. 546-567.
[47] A. Clarke, et al., “Biomass Burning and Pollution Aerosol over North America: Organic Components and Their Influence on Spectral Optical Properties and Humidification Response,” Journal of Geophysical Research: Atmospheres, Vol. 112, No. D12, 2007, Article ID: D12S18. http://dx.doi.org/10.1029/2006JD007777
[48] G. Hanel, “The Properties of Atmospheric Aerosol Particles as Functions of Relative Humidity at Thermodynamic Equilibrium with Surrounding Moist Air,” In: H. E. Landsberg and J. Van Mieghem, Eds., Advances in Geophysics, Academic Press, New York, 1976, pp. 73-188.
[49] M. K. Latha and K. V. S. Badarinath, “Factors Influencing Aerosol Characteristics over Urban Environment,” Environmental Monitoring and Assessment, Vol. 104, No. 1-3, 2005, pp. 269-280. http://dx.doi.org/10.1007/s10661-005-1615-7
[50] A. Angstrom, “Techniques of Determining the Turbidity of the Atmosphere,” Tellus, Vol. 13, No. 2, 1961, pp. 214-223. http://dx.doi.org/10.1111/j.2153-3490.1961.tb00078.x
[51] M. D. King and D. M. Byrne, “A Method for Inferring Total Ozone Content from Spectral Variation of Total Optical Depth Obtained with a Solar Radiometer,” Journal of the Atmospheric Sciences, Vol. 33, No. 11, 1976, pp. 2242-2251. http://dx.doi.org/10.1175/1520-0469(1976)033<2242:AMFITO>2.0.CO;2
[52] T. F. Eck, B. N. Holben, J. S. Reid, O. Dubovic, A. Smirnov, N. T. O’Neil, I. Slutsker and S. Kinne, “Wavelength Dependence of the Optical Depth of Biomass Burning, Urban, and Desert Dust Aerosols,” Journal of Geophysical Research: Atmospheres, Vol. 104, No. D24, 1999, pp. 31333-31349.
[53] T. F. Eck, B. N. Holben, O. Dubovic, A. I. Smirnov, J. Slutsker, M. Lobert and V. Ramanathan, “Column-Integrated Aerosol Optical Properties over the Maldives during the Northeast Mon-Soon for 1998-2000,” Journal of Geophysical Research: Atmospheres, Vol. 106, 2001, pp. 28555-28566.
[54] T. F. Eck, B. N. Holben, D. E. Ward, O. Dubovic, J. S. Reid, A. Smirnov, M. M. Mukelabai, N. C. Hsu, N. T. O’ Neil and I. Slutsker, “Characterization of the Optical Properties of Biomass Burning Aerosols in Zambia during the 1997 ZIBBEE Field Campaign,” Journal of Geophysical Research: Atmospheres, Vol. 106, No. D4, 2001, pp. 3425-3448. http://dx.doi.org/10.1029/2000JD900555
[55] Y. J. Kaufman, “Aerosol Optical Thickness and Atmospheric Path Radiance,” Journal of Geophysical Research: Atmospheres, Vol. 98, No. D2, 1993, pp. 2677-2992. http://dx.doi.org/10.1029/92JD02427
[56] N. T. O’Neill, O. Dubovic and T. F. Eck, “Modified Angstrom Exponent for the Characterization of Submicrometer Aerosols,” Applied Optics, Vol. 40, No. 15, 2001, pp. 2368-2375. http://dx.doi.org/10.1364/AO.40.002368
[57] N. T. O’Neill, T. F. Eck, A. Smirnov, B. N. Holben and S. Thulasiraman, “Spectral Discrimination of Coarse and Fine Mode Optical Depth,” Journal of Geophysical Research: Atmospheres, Vol. 108, No. D17, 2003.
[58] R. Pedros, J. A. Martinez-Lozano, M. P. Utrillas, J. L. Gomez-Amo and F. Tena, “Column-Integrated Aerosol, Optical Properties from Ground-Based Spectroradiometer Measurements at Barrax (Spain) during the Digital Airborne Imaging Spectrometer Experiment (DAISEX) Campaigns,” Journal of Geophysical Research: Atmospheres, Vol. 108, No. D18, 2003, pp. 1-12. http://dx.doi.org/10.1029/2002JD003331
[59] D. G. Kaskaoutis and H. D. Kambezidis, “Investigation on the Wavelength Dependence of the Aerosol Optical Depth in the Athens Area,” Quarterly Journal of the Royal Meteorological Society, Vol. 132, No. 620, 2006, pp. 2217-2234. http://dx.doi.org/10.1256/qj.05.183
[60] B. Schmid, D. A. Hegg, J. Wang, D. Bates, J. Redemann, P. B. Russell, J. M. Livingston, H. H. Jonsson, E. J. Welton, J. H. Seinfeld, R. C. Flagan, D. S. Covert, O. Dubovik and A. Jefferson, “Column Closure Studies of Lower Tropospheric Aerosol and Water Vapor during ACE-Asia Using Airborne Sun Photometer and Airborne in Situ and Ship-Based Lidar Measurements,” Journal of Geophysical Research: Atmospheres, Vol. 108, No. D23, 2003, pp. 1-19. http://dx.doi.org/10.1029/2002JD003361
[61] J. A. Martinez-Lozano, M. P. Utrillas, F. Tena, R. Pedros, J. Canada, J. V. Bosca and J. Lorente, “Aerosol Optical Characteristics from Summer Campaign in an Urban Coastal Mediterranean Area,” IEEE Transactions on Geoscience and Remote Sensing, Vol. 39, No. 7, 2001, pp. 1573-1585. http://dx.doi.org/10.1109/36.934089
[62] D. E. Aspens, “Local-Field Effect and Effective Medium Theory: A Microscopic Perspective,” American Journal of Physics, Vol. 50, No. 8, 1982, pp. 704-709. http://dx.doi.org/10.1119/1.12734
[63] H. A. Lorentz, “Ueber Die Beziehungzwischen der Fortpflanzungsgeschwindigkeit des Lichtes und der Korperdichte,” Annalen der Physik, Vol. 245, No. 4, 1880, pp. 641-665. http://dx.doi.org/10.1002/andp.18802450406
[64] L. Lorenz, “Ueber Die Refractionconstante,” Annalen der Physik, Vol. 11, No. 1, 1880, pp. 70-103.
[65] K. N. Liou, “An Introduction to Atmospheric Radiation,” Elsevier, New York, 2002.
[66] J. Wang and S. T. Martin, “Satellite Characterization of Urban Aerosols: Importance of Including Hygroscopicity and Mixing State in the Retrieval Algorithms,” Journal of Geophysical Research: Atmospheres, Vol. 112, No. D17203, 2007, pp. 1-18. http://dx.doi.org/10.1029/2006JD008078
[67] M. O. Andreae and D. Rosenfeld, “Aerosol-Cloud-Precipitation Interactions. Part 1. The Nature and Sources of Cloud-Active Aerosols,” Earth-Science Reviews, Vol. 89, No. 1-2, 2008, pp. 13-41. http://dx.doi.org/10.1016/j.earscirev.2008.03.001
[68] T. F. Eck, B. N. Holben, D. E. Ward, M. M. Mukelabai, O. Dubovik, A. Smirnov, J. S. Schafer, N. C. Hsu, S. J. Piketh, A. Queface, J. Le Roux, R. J. Swap and I. Slutsker, “Variability of Biomass Burning Aerosol Optical Characteristics in Southern Africa during the SAFARI 2000 Dry Season Campaign and a Comparison of Single Scattering Albedo Estimates from Radiometric Measurements,” Journal of Geophysical Research: Atmosphere, Vol. 108, No. D13, 2003, pp.
[69] G. L. Schuster, O. Dubovik and B. N. Holben, “Angstrom Exponent and Bimodal Aerosol Size Distributions,” Journal of Geophysical Research: Atmosphere, Vol. 111, No. D17, 2006, Article ID: D07207. http://dx.doi.org/10.1029/2005JD006328
[70] D. G. Kaskaoutis, H. D. Kambezidis, N. Hatzianastassiou, P. G. Kosmopoulos and K. V. S. Badarinath, “Aerosol Climatology: Dependence of the Angstrom Exponent on Wavelength over Four AERONET Sites,” Atmospheric Chemistry and Physical Discussion, Vol. 7, No. 3, 2007, pp. 7347-7397. http://dx.doi.org/10.5194/acpd-7-7347-2007
[71] D. G. Kaskaoutis, H. D. Kambezidis, N. Hatzianastassiou, P. G. Kosmopoulos and K. V. S. Badarinath, “Aerosol Climatology: On the Discrimination of Aerosol Types over four AERONET Sites,” Atmospheric Chemistry and Physical Discussion, Vol. 7, No. 3, 2007, pp. 6357-6411. http://dx.doi.org/10.5194/acpd-7-6357-2007

  
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