Long term measurements of aerosol optical properties at a primary forest site in Amazonia

Atmospheric Chemistry and Physics

Volumn 13, Issue 5, 2013, Pages 2391-2413

  Rizzo, L V ^a   Artaxo, P ^b   Muller T ^c   Wiedensohler, A ^c   Paixao M ^c   Cirino, G G ^d   Arana, A ^b   Swietlicki, E ^e   Roldin, P ^e   Fors, E O ^e   Wiedemann, K T ^f   Leal, L S M ^d   Kulmala, M ^g  

^a FEDERAL UNIVERSITY OF SÃO PAULO   (Brazil)

^b UNIVERSITY OF SÃO PAULO   (Brazil)

^c LEIBNIZ INSTITUTE FOR TROPOSPHERIC RESEARCH   (Germany)

^d INSTITUTO NACIONAL DE PESQUISAS DA AMAZÔNIA   (Brazil)

^e LUND UNIVERSITY   (Sweden)

^f HARVARD UNIVERSITY   (United States)

^g UNIVERSITY OF HELSINKI   (Finland)

Author keywords

[No Author keywords available]

Indexed keywords

ABSORPTION; AEROSOL; BIOMASS BURNING; CONCENTRATION (COMPOSITION); DUST; OPTICAL PROPERTY; PLUME;

AMAZON BASIN; AMAZONIA;

EID: 84874509003     PISSN: 16807316     EISSN: 16807324     Source Type: Journal    
DOI: 10.5194/acp-13-2391-2013     Document Type: Article

References (84)

1. Anderson, T. L., Covert, D. S., Marshall, S. F., Laucks, M. L., Charl-son, R. J., Waggoner, A. P., Ogren, J. A., Caldow, R., Holm, R. L., Quant, F. R., Sem, G. J., Wiedensohler, A., Ahlquist, N. A., and Bates, T. S.: Performance characteristics of a high-sensitivity, three-wavelength, total scatter/backscatter nephelometer, Am. Meteorol. Soc., 13, 967-986, 1996. (Pubitemid 126567037)
2. Anderson, T. L. and Ogren, J. A.: Determining Aerosol Radiative Properties Using the TSI 3563 Integrating Nephelometer, Aerosol Sci. Technol., 29, 57-69, doi:10.1080/02786829808965551, 1998. (Pubitemid 28285664)
3. Anderson, T. L., Covert, D. S., Wheeler, J. D., Harris, J., Perry, K. D., Trost, B. E., Jaffe, D. J., and Ogren, J. A.: Aerosol backscat-ter fraction and single scattering albedo: Measured values and uncertainties at a coastal station in the Pacific Northwest, J. Geo-phys. Res., 104, 26793-26807, 1999.
4. Anderson, T. L., Masonis, S. J., Covert, D. S., Ahlquist, N. C., Howell, S. G., Clarke, A. D., and Mcnaughton, C. S.: Variability of aerosol optical properties derived from in situ aircraft measurements during ACE-Asia, J. Geophys. Res., 108, 8647, doi:10.1029/2002JD003247, 2003.
5. Andreae, M. O.: Correlation between cloud condensation nuclei concentration and aerosol optical thickness in remote and polluted regions, Atmos. Chem. Phys., 9, 543-556, doi:10.5194/acp-9-543-2009, 2009.
6. Andreae, M. O. and Crutzen, P. J.: Atmospheric Aerosols: Biogeo-chemical Sources and Role in Atmospheric Chemistry, Science, 276, 1052, doi:10.1126/science.276.5315.1052, 1997. (Pubitemid 27218103)
7. Andreae, M. O. and Gelencsér, A.: Black carbon or brown carbon? The nature of light-absorbing carbonaceous aerosols, At-mos. Chem. Phys., 6, 3131-3148, doi:10.5194/acp-6-3131-2006, 2006. (Pubitemid 44154660)
8. Andreae, M. O., Rosenfeld, D., Artaxo, P., Costa, A. A., Frank, G. P., Longo, K. M., and Silva-Dias, M. A. F.: Smoking Rain Clouds over the Amazon, Science, 303, 1337-1342, doi:10.1126/science.1092779, 2004. (Pubitemid 38269420)
9. Andrews, E., Sheridan, P. J., Fiebig, M., McComiskey, A., Ogren, J. a., Arnott, P., Covert, D., Elleman, R., Gasparini, R., Collins, D., Jonsson, H., Schmid, B. and Wang, J.: Comparison of methods for deriving aerosol asymmetry parameter, J. Geophys. Res., 111, 1-16, doi:10.1029/2004JD005734, 2006.
10. Angstrom, A.: On the Atmospheric Transmission of Sun Radiation and on Dust in the Air, Geograf. Ann., 11, 156-166, 1929.
11. Ansmann, A., Baars, H., Tesche, M., Müller, D., Althausen, D., En-gelmann, R., Pauliquevis, T. and Artaxo, P.: Dust and smoke transport from Africa to South America: Lidar profiling over Cape Verde and the Amazon rainforest, Geophys. Res. Lett., 36, 2-6, doi:10.1029/2009GL037923, 2009.
12. Araújo, A. C., Nobre, A. D., Kruijt, B., Elbers, J. A., Dallarosa, R., Stefani, P., von Randow, C., Manzi, A. O., Culf, A. D., Gash, J. H. C., Valentini, R., and Kabat, P: Comparative measurements of carbon dioxide fluxes from two nearby towers in a central Amazonian rainforest: The Manaus LBA site, J. Geophys. Res., 107, 1-20, doi:10.1029/2001JD000676, 2002.
13. Artaxo, P. and Hansson, H.-C.: Size Distribution of Biogenic Aerosol Particles, Atmos. Environ., 29, 393-402, 1995.
14. Artaxo, P., Gerab, F., Yamasoe, M. A., and Martins, J. V: Fine mode aerosol composition at three long-term atmospheric monitoring sites in the Amazon Basin, J. Geophys. Res., 99, 22857-22868, 1994.
15. Artaxo, P., Martins, J. V., Yamasoe, M. A., Procópio, A. S., Pauliquevis, T. M., Andreae, M. O., Guyon, P., Gatti, L. V., and Cordova, A. M. L.: Physical and chemical properties of aerosols in the wet and dry seasons in Rondônia, Amazonia, J. Geophys. Res., 107, 8081, doi:10.1029/2001JD000666, 2002.
16. Baars, H., Ansmann, A., Althausen, D., Engelmann, R., Artaxo, P., Pauliquevis, T., and Souza, R.: Further evidence for significant smoke transport from Africa to Amazonia, Geophys. Res. Lett., 38, 1-6, doi:10.1029/ 2011GL049200, 2011.
17. Baars, H., Ansmann, A., Althausen, D., Engelmann, R., Heese, B., Müller, D., Artaxo, P., Paixao, M., Pauliquevis, T., and Souza, R.: Aerosol profiling with lidar in the Amazon Basin during the wet and dry season, J. Geophys. Res., 117, 1-16, D21201, doi:10.1029/2012JD018338, 2012.
18. Ben-Ami, Y., Koren, I., Rudich, Y., Artaxo, P., Martin, S. T., and Andreae, M. O.: Transport of North African dust from the Bodélé depression to the Amazon Basin: a case study, Atmos. Chem. Phys., 10, 7533-7544, doi:10.5194/acp-10-7533-2010, 2010.
19. Bohren, C. F. and Huffman, D. R.: Absorption and scattering of light by small particles, Wiley-Vch, Mörlenbach, Germany, 2008.
20. Bond, T. and Bergstrom, R.: Light Absorption by Carbonaceous Particles: An Investigative Review, Aerosol Sci. Technol., 40, 27-67, doi:10.1080/ 02786820500421521, 2006.
21. Capes, G., Johnson, B., Mcfiggans, G., Williams, P. I., Haywood, J., and Coe, H.: Aging of biomass burning aerosols over West Africa: Aircraft measurements of chemical composition, micro-physical properties, and emission ratios, J. Geophys. Res., 113, 1-13, D00C15, doi:10.1029/2008JD009845, 2008.
22. Chand, D., Guyon, P., Artaxo, P., Schmid, O., Frank, G. P., Rizzo, L. V., Mayol-Bracero, O. L., Gatti, L. V., and Andreae, M. O.: Optical and physical properties of aerosols in the boundary layer and free troposphere over the Amazon Basin during the biomass burning season, Atmos. Chem. Phys., 6, 2911-2925, doi:10.5194/acp-6-2911-2006, 2006. (Pubitemid 44091754)
23. Chen, Q., Farmer, D. K., Schneider, J., Zorn, S. R., Heald, C. L., Karl, T. G., Guenther, A., Allan, J. D., Robinson, N., Coe, H., Kimmel, J. R., Pauliquevis, T., Borrmann, S., Pöschl, U., An-dreae, M. O., Artaxo, P., Jimenez, J. L., Martin, S. T.: Mass spectral characterization of submicron biogenic organic particles in the Amazon Basin, Geophys. Res. Lett., 36, 1-5, L20806, doi:10.1029/2009GL039880, 2009.
24. Cheng, Y. F., Eichler, H., Wiedensohler, A., Heintzenberg, J., Zhang, Y. H., Hu, M., Herrmann, H., Zeng, L. M., Liu, S., Gnauk, T., Brüggemann, E., and He, L. Y.: Mixing state of elemental carbon and non-light-absorbing aerosol components derived from in situ particle optical properties at Xinken in Pearl River Delta of China, J. Geophys. Res., 111, 1-18, doi:10.1029/2005JD006929, 2006. (Pubitemid 44941274)
25. Cheng, Y. F., Wiedensohler, A., Eichler, H., Heintzenberg, J., Tesche, M., Ansmann, A., Wendisch, M., Su, H., Althausen, D., and Herrmann, H.: Relative humidity dependence of aerosol optical properties and direct radiative forcing in the surface boundary layer at Xinken in Pearl River Delta of China: An observation based numerical study, Atmos. Environ., 42, 6373-6397, doi:10.1016/j.atmosenv.2008.04.009, 2008.
26. Collaud Coen, M., Weingartner, E., Nyeki, S., Cozic, J., Hen-ning, S., Verheggen, B., Gehrig, R., and Baltensperger, U.: Long-term trend analysis of aerosol variables at the high-alpine site Jungfraujoch, J. Geophys. Res., 112, D13213, doi:10.1029/2006JD007995, 2007. (Pubitemid 47408384)
27. Davidson, E. A., Artaxo, P., Balch, J. K., Brown, I. F., Bustamante, M. M. C., Arau, A. C. De, Coe, M. T., Defries, R. S., Keller, M., Longo, M., Munger, J. W., Schroeder, W., Soares-Filho, B. S., Souza Jr., C. M., and Wofsy, S. C.: The Amazon basin in transition, Nature, 481, 321-328, doi:10.1038/nature10717, 2012.
28. Doherty, S. J., Quinn, P. K., Jefferson, A., Carrico, C. M., Anderson, T. L., and Hegg, D.: A comparison and summary of aerosol optical properties as observed in situ from aircraft, ship, and land during ACE-Asia, J. Geophys. Res., 110, D04201, doi:10.1029/2004JD004964, 2005. (Pubitemid 40599444)
29. Draxler, R. R. and Rolph, G.: HYbrid Single-Particle Lagrangian Integrated Trajectory) Model access via NOAA ARL READY Website, HYSPLIT (HYbrid Single-Particle Lagrangian Integrated Trajectory) Model access via NOAA ARL READY Website, available online from: http://ready.arl.noaa.gov/HYSPLIT. php, 2012.
30. Dubovik, O., Holben, B., Eck, T. F., Smirnov, A., Kaufman, Y. J., King, M. D., Tanré, D. and Slutsker, I.: Variability of Absorp-tion and Optical Properties of Key Aerosol Types Observed in Worldwide Locations, Journal of the Atmospheric Sciences, 59, 590-608, doi:10.1175/1520-0469(2002), 2002. (Pubitemid 34838293)
31. Fan, J., Zhang, R., Tao, W.-K., and Mohr, K. I.: Effects of aerosol optical properties on deep convective clouds and radiative forcing, J. Geophys. Res., 113, 1-16, doi:10.1029/2007JD009257, 2008.
32. Forster, P., Ramaswamy, V., Artaxo, P., Berntsen, T., Betts, R., Fahey, D. W., Haywood, J., Lean, J., Lowe, D. C., Myhre, G., Nganga, J., Prinn, R., Raga, G., Schulz, M., Van Dor-land, R., Bodeker, G., Boucher, O., Collins, W. D., Conway, T. J., Dlugokencky, E., Elkins, J. W., Etheridge, D., Foukal, P., Fraser, P., Geller, M., Joos, F., Keeling, C. D., Kinne, S., Lassey, K., Lohmann, U., Manning, A. C., Montzka, S., Oram, D., O'Shaughnessy, K., Piper, S., Plattner, G.-K., Ponater, M., Ramankutty, N., Reid, G., Rind, D., Rosenlof, K., Sausen, R., Schwarzkopf, D., Solanki, S. K., Stenchikov, G., Stuber, N., Takemura, T., Textor, C., Wang, R., Weiss, R. and Whorf, T.: Changes in atmospheric constituents and in radiative forcing. Climate Change 2007: The Physical Science Basis, edited by: Solomon, S., Qin, D., Manning, M., Chen, Z., Marquis, M., Av-eryt, K. B., Tignor, M., and Miller, H. L., Cambridge University Press, Cambridge, UK and New York, USA, 2007.
33. Garland, R. M., Yang, H., Schmid, O., Rose, D., Nowak, A., Achtert, P., Wiedensohler, A., Takegawa, N., Kita, K., Miyazaki, Y., Kondo, Y., Hu, M., Shao, M., Zeng, L. M., Zhang, Y. H., Andreae, M. O., and Pöschl, U.: Aerosol optical properties in a rural environment near the mega-city Guangzhou, China: implications for regional air pollution, radiative forcing and remote sensing, Atmos. Chem. Phys., 8, 5161-5186, doi:10.5194/acp-8-5161-2008, 2008.
34. Guyon, P., Boucher, O., Graham, B., Beck, J., Mayol-bracero, O. L., Roberts, G. C., Maenhaut, W., Artaxo, P., and Andreae, M. O.: Refractive index of aerosol particles over the Amazon tropical forest during LBA-EUSTACH 1999, J. Aerosol Sci., 34, 883-907, doi:10.1016/S0021-8502(03)00052-1, 2003. (Pubitemid 36870736)
35. Guyon, P., Graham, B., Roberts, G. C., Mayol-bracero, O. L., Maen-haut, W., Artaxo, P., and Andreae, M. O.: Sources of optically active aerosol particles over the Amazon forest, Atmos. Environ., 38, 1039-1051, doi:10.1029/2003JD003465, 2004. (Pubitemid 38083235)
36. Haerter, J. O., Roeckner, E., Tomassini, L., and von Storch, J.-S.: Parametric uncertainty effects on aerosol radiative forcing, Geo-phys. Res. Lett., 36, 1-5, doi:10.1029/2009GL039050, 2009.
37. Hand, J. L. and Kreidenweis, S. M.: A New Method for Retrieving Particle Refractive Index and Effective Density from Aerosol Size Distribution Data A New Method for Retrieving Particle Refractive Index and Effective Density from Aerosol Size Distribution Data, Aerosol Sci. Technol., 36, 1012-1026, doi:10.1080/0278682029009227, 2002.
38. Hansen, J., Sato, M., and Ruedy, R.: Radiative forcing and climate response, J. Geophys. Res., 102, 6831-6864, 1997.
39. Haywood, J. M. and Shine, K. P.: The effect of anthropogenic sul-fate and soot aerosol on the clear sky planetary radiation budget, Geophys. Res. Lett., 22, 603-606, 1995.
40. Heim, M., Mullins, B., Umhauer, H. and Kasper, G.: Performance evaluation of three optical particle counters with an efficient "multimodal" calibration method, J. Aerosol Sci., 39, 1019-1031, doi:10.1016/j.jaerosci.2008. 07.006, 2008.
41. Hinds, W. C.: Aerosol Technology, Wiley-Interscience, New York, USA, 1999.
42. Hobbs, P. V., Reid, J. S., Kotchenruther, R. A., Ferek, R. J., and Weiss, R.: Direct Radiative Forcing by Smoke from Biomass Burning, Science, 275(5307), 1777-1778, doi:10.1126/science.275.5307.1777, 1997.
43. Holben, B. N., Eck, T. F., Slutsker, I., Smirnov, A., Sinyuk, A., Schafer, J., Giles, D., and Dubovik, O.: Aeronet's Version 2.0 quality assurance criteria, available online from: http://aeronet. gsfc.nasa.gov/new web/PDF/AERONETcriteria final1.pdf, 2006.
44. Hudson, J. G. and Yum, S. S.: Cloud condensation nuclei spectra and polluted and clean clouds over the Indian Ocean, J. Geophys. Res., 107, 8022, doi:10.1029/2001JD000829, 2002. (Pubitemid 44793911)
45. Hulstrom, R., Bird, R., and Riordan, C.: Spectral solar irradiance data sets for selected terrestrial conditions, Sol. Cells, 15, 365-391, 1985. (Pubitemid 16474711)
46. IBGE: Estimativa Populacional-Instituto Brasileiro de Geografia e Estat́stica available online from www.ibge.gov.br/home/estatistica/ populacao/estimativa2011, 2011.
47. Kaufman, Y., Hobbs, P., Kirchhoff, V., Artaxo, P., Remer, L. A., Holben, B. N., King, M. D., Ward, D. E., Prins, E. M., Longo, K. M., Mattos, L. F., Nobre, C. A., Spinhirne, J. D., Ji, Q., Thompson, A. M., Gleason, J. F., Christopher, S. A., and Tsay, S. C.: Smoke, clouds, and radiation-Brazil (SCAR-B) experiment, J. Geophys. Res., 103, 31783-31808, 1998. (Pubitemid 128665602)
48. Kaufman, Y. J., Koren, I., Remer, L. A., Tanré, D., Ginoux, P., and Fan, S.: Dust transport and deposition observed from the Terra-Moderate Resolution Imaging Spectroradiometer (MODIS) spacecraft over the Atlantic Ocean, J. Geophys. Res., 110, 1-16, doi:10.1029/2003JD004436, 2005. (Pubitemid 40919762)
49. Komppula, M., Lihavainen, H., Kerminen, V. M., Kulmala, M., and Viisanen, Y.: Measurements of cloud droplet activation of aerosol particles at a clean subarctic background site, J. Geophys. Res., 110, D06204, doi:10.1029/ 2004JD005200, 2005. (Pubitemid 40771625)
50. Koren, I., Kaufman, Y. J., Remer, L. A., and Martins, J. V.: Measurement of the Effect of Amazon Smoke on Inhibition of Cloud Formation, Science, 303, 1342, doi:10.1126/science.1089424, 2004. (Pubitemid 38269421)
51. Kotchenruther, R. A. and Hobbs, P. V: Humidification factors of aerosols from biomass burning in Brazil, J. Geophys. Res., 103, 32081-32089, 1998. (Pubitemid 128665623)
52. Kulmala, M., Asmi, A., Lappalainen, H. K., Baltensperger, U., Brenguier, J.-L., Facchini, M. C., Hansson, H.-C., Hov, Ø., O'Dowd, C. D., Pöschl, U., Wiedensohler, A., Boers, R., Boucher, O., de Leeuw, G., Denier van der Gon, H. A. C., Fe-ichter, J., Krejci, R., Laj, P., Lihavainen, H., Lohmann, U., Mc-Figgans, G., Mentel, T., Pilinis, C., Riipinen, I., Schulz, M., Stohl, A., Swietlicki, E., Vignati, E., Alves, C., Amann, M., Ammann, M., Arabas, S., Artaxo, P., Baars, H., Beddows, D. C. S., Bergström, R., Beukes, J. P., Bilde, M., Burkhart, J. F., Canonaco, F., Clegg, S. L., Coe, H., Crumeyrolle, S., D'Anna, B., Decesari, S., Gilardoni, S., Fischer, M., Fjaeraa, A. M., Foun-toukis, C., George, C., Gomes, L., Halloran, P., Hamburger, T., Harrison, R. M., Herrmann, H., Hoffmann, T., Hoose, C., Hu, M., Hyvärinen, A., Hõrrak, U., Iinuma, Y., Iversen, T., Josipovic, M., Kanakidou, M., Kiendler-Scharr, A., Kirkeva?g, A., Kiss, G., Klimont, Z., Kolmonen, P., Komppula, M., Kristjánsson, J.-E., Laakso, L., Laaksonen, A., Labonnote, L., Lanz, V. A., Lehtinen, K. E. J., Rizzo, L. V., Makkonen, R., Manninen, H. E., McMeek-ing, G., Merikanto, J., Minikin, A., Mirme, S., Morgan, W. T., Nemitz, E., O'Donnell, D., Panwar, T. S., Pawlowska, H., Pet-zold, A., Pienaar, J. J., Pio, C., Plass-Duelmer, C., Prévôt, A. S. H., Pryor, S., Reddington, C. L., Roberts, G., Rosenfeld, D., Schwarz, J., Seland, Ø., Sellegri, K., Shen, X. J., Shiraiwa, M., Siebert, H., Sierau, B., Simpson, D., Sun, J. Y., Topping, D., Tunved, P., Vaattovaara, P., Vakkari, V., Veefkind, J. P., Viss-chedijk, A., Vuollekoski, H., Vuolo, R., Wehner, B., Wildt, J., Woodward, S., Worsnop, D. R., van Zadelhoff, G.-J., Zardini, A. A., Zhang, K., van Zyl, P. G., Kerminen, V.-M., Carslaw, K., and Pandis, S. N.: General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI)-integrating aerosol research from nano to global scales, Atmos. Chem. Phys., 11, 13061-13143, doi:10.5194/acp-11-13061-2011, 2011.
53. Lewis, S. L., Brando, P. M., Phillips, O. L., van der Heijden, G. M. F. and Nepstad, D.: The 2010 Amazon drought, Science, New York, NY, 331, 6017, doi:10.1126/science.1200807, 2011.
54. Loeb, N. G. and Su, W.: Direct Aerosol Radiative Forcing Uncertainty Based on a Radiative Perturbation Analysis, J. Climate, 23, 5288-5293, doi:10.1175/2010JCLI3543.1, 2010.
55. Ma, N., Zhao, C. S., Nowak, A., Müller, T., Pfeifer, S., Cheng, Y. F., Deng, Z. Z., Liu, P. F., Xu, W. Y., Ran, L., Yan, P., Göbel, T., Hallbauer, E., Mildenberger, K., Henning, S., Yu, J., Chen, L. L., Zhou, X. J., Stratmann, F., and Wiedensohler, A.: Aerosol optical properties in the North China Plain during HaChi campaign: an in-situ optical closure study, Atmos. Chem. Phys., 11, 5959-5973, doi:10.5194/acp-11-5959-2011, 2011.
56. Ma, N., Zhao, C. S., Müller, T., Cheng, Y. F., Liu, P. F., Deng, Z. Z., Xu, W. Y., Ran, L., Nekat, B., van Pinxteren, D., Gnauk, T., Müller, K., Herrmann, H., Yan, P., Zhou, X. J., and Wiedensohler, A.: A new method to determine the mixing state of light absorbing carbonaceous using the measured aerosol optical properties and number size distributions, Atmos. Chem. Phys., 12, 2381-2397, doi:10.5194/acp-12-2381-2012, 2012.
57. Mack, L. A., Levin, E. J. T., Kreidenweis, S. M., Obrist, D., Moosmüller, H., Lewis, K. A., Arnott, W. P., McMeeking, G. R., Sullivan, A. P., Wold, C. E., Hao, W.-M., Collett Jr., J. L., and Malm, W. C.: Optical closure experiments for biomass smoke aerosols, Atmos. Chem. Phys., 10, 9017-9026, doi:10.5194/acp-10-9017-2010, 2010.
58. Magi, B. I., Hobbs, P. V, Schmid, B. and Redemann, J.: Vertical profiles of light scattering, light absorption, and single scattering albedo during the dry, biomass burning season in southern Africa and comparisons of in situ and remote sensing measurements of aerosol optical depths, J. Geophys. Res., 108, 8504, doi:10.1029/2002JD002361, 2003.
59. Martin, S. T., Andreae, M. O., Althausen, D., Artaxo, P., Baars, H., Borrmann, S., Chen, Q., Farmer, D. K., Guenther, A., Gunthe, S. S., Jimenez, J. L., Karl, T., Longo, K., Manzi, A., Müller, T., Pauliquevis, T., Petters, M. D., Prenni, A. J., Pöschl, U., Rizzo, L. V., Schneider, J., Smith, J. N., Swietlicki, E., Tota, J., Wang, J., Wiedensohler, A., and Zorn, S. R.: An overview of the Amazonian Aerosol Characterization Experiment 2008 (AMAZE-08), Atmos. Chem. Phys., 10, 11415-11438, doi:10.5194/acp-10-11415-2010, 2010a.
60. Martin, S. T., Andreae, M. O., Artaxo, P., Baumgardner, D., Chen, Q., Goldstein, A. H., Guenther, A., Heald, C. L., Bracero, O. L. M., McMurry, P. H., Pauliquevis, T., Pöschl, U., Prather, K. A., Roberts, G. C., Saleska, S. R., Silva Dias, M. A., Spracklen, D. V., Swietlicki, E. and Trebs, I.: Sources and properties of Amazonian aerosol particles, Rev. Geophys., 48, RG2002, doi:10.1029/2008RG000280, 2010b.
61. Martins, J. V., Artaxo, P., Liousse, C., Reid, J. S., Hobbs, P. V., and Kaufman, Y. J.: Effects of black carbon content, particle size, and mixing on light absorption by aerosols from biomass burning in Brazil, J. Geophys. Res., 103, 32041-32050, 1998. (Pubitemid 128665620)
62. Müller, T., Schladitz, A., Massling, A., Kaaden, N., Kandler, K., and Wiedensohler, A.: Spectral absorption coefficients and imaginary parts of refractive indices of Saharan dust during SAMUM-1, Tellus B, 61, 79-95, doi:doi:10.1111/j.1600-0889.2008.00399.x, 2009.
63. Müller, T., Henzing, J. S., de Leeuw, G., Wiedensohler, A., Alastuey, A., Angelov, H., Bizjak, M., Collaud Coen, M., En-gström, J. E., Gruening, C., Hillamo, R., Hoffer, A., Imre, K., Ivanow, P., Jennings, G., Sun, J. Y., Kalivitis, N., Karlsson, H., Komppula, M., Laj, P., Li, S.-M., Lunder, C., Marinoni, A., Martins dos Santos, S., Moerman, M., Nowak, A., Ogren, J. A., Pet-zold, A., Pichon, J. M., Rodriquez, S., Sharma, S., Sheridan, P. J., Teinilä, K., Tuch, T., Viana, M., Virkkula, A., Weingart-ner, E., Wilhelm, R., and Wang, Y. Q.: Characterization and in-tercomparison of aerosol absorption photometers: result of two intercomparison workshops, Atmos. Meas. Tech., 4, 245-268, doi:10.5194/amt-4-245-2011, 2011.
64. Nessler, R., Weingartner, E., and Baltensperger, U.: Effect of humidity on aerosol light absorption and its implications for extinction and the single scattering albedo illustrated for a site in the lower free troposphere, J. Aerosol Sci., 36, 958-972, doi:10.1016/j.jaerosci.2004.11.012, 2005. (Pubitemid 40968173)
65. Petzold, A., Schloesser, H., Sheridan, P., Arnott, W. P., Ogren, J., and Virkkula, A.: Evaluation of Multiangle Absorption Photometry for Measuring Aerosol Light Absorption, Aerosol Sci. Tech-nol., 39, 40-51, doi:10.1080/027868290901945, 2005. (Pubitemid 40095661)
66. Prenni, A. J., Petters, M. D., Kreidenweis, S. M., Heald, C. L., Martin, S. T., Artaxo, P., Garland, R. M., Wollny, A. G., and Pöschl, U.: Relative roles of biogenic emissions and Saharan dust as ice nuclei in the Amazon basin, Nature Geosci., 2, 402-405, doi:10.1038/ngeo517, 2009.
67. Procopio, A. S., Artaxo, P., Kaufman, Y. J., Remer, L. A., Schafer, J. S., and Holben, B. N.: Multiyear analysis of amazonian biomass burning smoke radiative forcing of climate, Geophys. Res. Lett., 31, L03108, doi:10.1029/2003GL018646, 2004.
68. Pöschl, U., Martin, S. T., Sinha, B., Chen, Q., Gunthe, S. S., Huffman, J. A., Borrmann, S., Farmer, D. K., Garland, R. M., Helas, G., Jimenez, J. L., King, S. M., Manzi, A., Mikhailov, E., Pauliquevis, T., Petters, M. D., Prenni, A. J., Roldin, P., Rose, D., Schneider, J., Su, H., Zorn, S. R., Artaxo, P., Andreae, M. O.: Rainforest Aerosols as Biogenic Nuclei of Clouds and Precipitation in the Amazon, Science, 329, 1513, doi:10.1126/science.1191056, 2010.
69. Reid, J. S., Hobbs, V., Ferek, J., Blake, R., and Dunlap, R.: Physical, chemical, and optical properties of regional hazes dominated by smoke in Brazil, J. Geophys. Res., 103, 32059-32080, 1998. (Pubitemid 128665622)
70. Reid, J. S., Eck, T. F., Christopher, S. A., Koppmann, R., Dubovik, O., Eleuterio, D. P., Holben, B. N., Reid, E. A., and Zhang, J.: A review of biomass burning emissions part III: intensive optical properties of biomass burning particles, Atmos. Chem. Phys., 5, 827-849, doi:10.5194/acp-5-827-2005, 2005. (Pubitemid 40479143)
71. Rissler, J., Vestin, A., Swietlicki, E., Fisch, G., Zhou, J., Artaxo, P., and Andreae, M. O.: Size distribution and hygroscopic properties of aerosol particles from dry-season biomass burning in Amazonia, Atmos. Chem. Phys., 6, 471-491, doi:10.5194/acp-6-471-2006, 2006.
72. Rizzo, L. V., Artaxo, P., Karl, T., Guenther, A. B., and Greenberg, J.: Aerosol properties, in-canopy gradients, turbulent fluxes and VOC concentrations at a pristine forest site in Amazonia, Atmos. Environ., 44, 503-511, doi:10.1016/j.atmosenv.2009.11.002, 2010.
73. Rizzo, L. V., Correia, a. L., Artaxo, P., Procópio, a. S., and Andreae, M. O.: Spectral dependence of aerosol light absorption over \newline the Amazon Basin, Atmos. Chem. Phys., 11, 8899-8912, doi:10.5194/acp-11-8899- 2011, 2011.
74. Rolph, G. D.: Real-time Environmental Applications and Display sYstem (READY) Website, NOAA Air Resources Laboratory, Silver Spring, MD [online] Available from: http://ready.arl.noaa.gov, 2012.
75. Schafer, J. S., Eck, T. F., Holben, B. N., Artaxo, P., and Duarte, a. F.: Characterization of the optical properties of atmospheric aerosols in Amazônia from long-term AERONET monitoring (1993-1995 and 1999-2006), J. Geophys. Res., 113, 1-16, doi:10.1029/2007JD009319, 2008.
76. Schkolnik, G., Chand, D., Hoffer, A., Andreae, M., Erlick, C., Swietlicki, E., and Rudich, Y.: Constraining the density and complex refractive index of elemental and organic carbon in biomass burning aerosol using optical and chemical measurements, Atmos. Environ., 41, 1107-1118, doi:10.1016/j. atmosenv.2006.09.035, 2007. (Pubitemid 44960910)
77. Schuster, G. L., Dubovik, O., and Holben, B. N.: Angstrom exponent and bimodal aerosol size distributions, J. Geophys. Res., 111, 1-14, doi:10.1029/2005JD006328, 2006.
78. Sena, E. T., Artaxo, P., and Correia, A. L.: Spatial variability of the direct radiative forcing of biomass burning aerosols and the effects of land use change in Amazonia, Atmos. Chem. Phys., 13, 1261-1275, doi:10.5194/acp-13-1261- 2013, 2013.
79. Sheridan, P. J., Jefferson, A., and Ogren, J. A.: Spatial variability of submicrometer aerosol radiative properties over the Indian Ocean during INDOEX, J. Geophys. Res., 107, 8011, doi:10.1029/2000JD000166, 2002. (Pubitemid 44793900)
80. Shindell, D. and Faluvegi, G.: Climate response to regional radiative forcing during the twentieth century, Nature Geosci., 2, 294-300, doi:10.1038/ngeo473, 2009.
81. Tuch, T. M., Haudek, A., Müller, T., Nowak, A., Wex, H., and Wiedensohler, A.: Design and performance of an automatic regenerating adsorption aerosol dryer for continuous operation at monitoring sites, Atmos. Meas. Tech., 2, 417-422, doi:10.5194/amt-2-417-2009, 2009.
82. Virkkula, a., Backman, J., Aalto, P. P., Hulkkonen, M., Riuttanen, L., Nieminen, T., dal Maso, M., Sogacheva, L., de Leeuw, G., and Kulmala, M.: Seasonal cycle, size dependencies, and source analyses of aerosol optical properties at the SMEAR II measurement station in Hyytiälä, Finland, Atmos. Chem. Phys., 11, 4445-4468, doi:10.5194/acp-11-4445-2011, 2011.
83. Wagner, R., Kandler, K., Linke, C., Muller, T., and Schnaiter, M.: Shape dependency of the extinction and absorption cross sections of dust aerosols modeled as randomly oriented spheroids, AAPP, Atti della Accademia Peloritana dei Peri-colanti, Classe di Scienze Fisiche, Matematiche e Naturali, 89, 1-4, doi:10.1478/C1V89S1P094, 2011.
84. Wiedensohler, A., Birmili, W., Nowak, A., Sonntag, A., Weinhold, K., Merkel, M., Wehner, B., Tuch, T., Pfeifer, S., Fiebig, M., Fjäraa, A. M., Asmi, E., Sellegri, K., Depuy, R., Venzac, H., Vil-lani, P., Laj, P., Aalto, P., Ogren, J. A., Swietlicki, E., Williams, P., Roldin, P., Quincey, P., Hüglin, C., Fierz-Schmidhauser, R., Gysel, M., Weingartner, E., Riccobono, F., Santos, S., Grüning, C., Faloon, K., Beddows, D., Harrison, R., Monahan, C., Jennings, S. G., O'Dowd, C. D., Marinoni, A., Horn, H.-G., Keck, L., Jiang, J., Scheckman, J., McMurry, P. H., Deng, Z., Zhao, C. S., Moerman, M., Henzing, B., de Leeuw, G., Löschau, G., and Bastian, S.: Mobility particle size spectrometers: harmonization of technical standards and data structure to facilitate high quality long-term observations of atmospheric particle number size distributions, Atmos. Meas. Tech., 5, 657-685, doi:10.5194/amt-5-657-2012, 2012.