Photoacoustic optical properties at UV, VIS, and near IR wavelengths for laboratory generated and winter time ambient urban aerosols

Atmospheric Chemistry and Physics

Volumn 12, Issue 5, 2012, Pages 2587-2601

  Gyawali, M ^a   Arnott, W P ^a   Zaveri, R A ^b   Song, C ^b   Moosmuller H ^a   Liu, L ^c   Mishchenko, M I ^c   Chen, L W A ^a   Green, M C ^a   Watson, J G ^a   Chow, J C ^a  

^a Nevada System of Higher Education   (United States)

^b PACIFIC NORTHWEST NATIONAL LABORATORY   (United States)

^c NASA GODDARD INSTITUTE FOR SPACE STUDIES   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ACOUSTIC PROPERTY; AEROSOL; AIR TEMPERATURE; BIOMASS BURNING; CALIBRATION; CONCENTRATION (COMPOSITION); INFRARED RADIATION; LIGHT SCATTERING; OPTICAL PROPERTY; PARTICULATE MATTER; PHOTOLYSIS; SPECTRAL ANALYSIS; TRAFFIC EMISSION; ULTRAVIOLET RADIATION;

NEVADA; RENO; UNITED STATES;

EID: 84863222787     PISSN: 16807316     EISSN: 16807324     Source Type: Journal    
DOI: 10.5194/acp-12-2587-2012     Document Type: Article

References (79)

1. Abu-Rahmah, A., Arnott, W. P., and Moosmüller, H.: Integrating nephelometer with a low truncation angle and an extended calibration scheme, Meas. Sci. Technol., 17, 1723-1732, 2006. (Pubitemid 43958849)
2. Ajtai, T., Filep, À., Schnaiter, M., Linke, C., Vragel, M., Bozóki, Z., Szabó, G., and Leisner, T.: A novel multi-wavelength pho-toacoustic spectrometer for the measurement of the UV-vis-NIR spectral absorption coefficient of atmospheric aerosols, J. Aerosol. Sci., 41, 1020-1029, 2010.
3. Ajtai, T., Filep, À., Utry, N., Schnaiter, M., Linke, C., Bozóki, Z., Szabó, G., and Leisner, T.: Inter-comparison of optical absorption coefficients of atmospheric aerosols determined by a multi-wavelength photoacoustic spectrometer and an Aethalometer under sub-urban wintry conditions, J. Aerosol Sci., 42, 859-866, 2011.
4. 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)
5. Arnott, W. P., Moosmüller, H., Rogers, C., Jin, T., and Bruch, R.: Photoacoustic spectrometer for measuring light absorption by aerosols: Instrument description, Atmos. Environ., 33, 2845-2852, 1999. (Pubitemid 29227241)
6. Arnott, W. P., Moosmüller, H., and Walker, J.: Nitrogen dioxide and kerosene-flame soot calibration of photoacoustic instruments for measurement of light absorption by aerosols, Rev. Sci. Instrum., 71, 4545-4552, 2000.
7. Arnott, W. P., Moosmüller, H., and Walker, J.: Nitrogen dioxide and kerosene-flame soot calibration of photoacoustic instruments for measurement of light absorption by aerosols, Rev. Sci. Instrum., 71, 4545-4552, 2000.
8. Arnott, W. P., Zielinska, B., Rogers, C. F., Sagebiel, J., Park, K., Chow, J., Moosmüller, H., Watson, J. G., Kelly, K., Wagner, D., Sarofim, A., Lighty, J., and Palmer, G.: Evaluation of 1047-nm Photoacoustic Instruments and Photoelectric Aerosol Sensors in Source-Sampling of Black Carbon Aerosol and Particle-Bound PAHs from Gasoline and Diesel Powered Vehicles, Environ. Sci. Technol., 39, 5398-5406, 2005a.
9. Arnott, W. P., Hamasha, K., Moosmüller, H., Sheridan, P., and Ogren, J.: Towards aerosol light-absorption measurements with a 7-wavelength Aethalometer: Evaluation with a photoacoustic instrument and 3-wavelength nephelometer, Aerosol Sci. Tech., 39, 17-29, 2005b. (Pubitemid 40095659)
10. Arnott, W. P., Walker, J., Moosmüller, H., Elleman, R., Jon-sson, H., Buzorius, G., Conant, W., Flagan, R., and Seinfeld, J.: Photoacoustic insight for aerosol light absorption aloft from meteorological aircraft and comparison with particle soot absorption photometer measurements: DOE Southern Great Plains climate research facility and the coastal stratocumulus imposed perturbation experiments, J. Geophys. Res., 111, D05S02, doi:10.1029/ 2005JD005964, 2006.
11. Barnard, J. C., Volkamer, R., and Kassianov, E. I.: Estimation of the mass absorption cross section of the organic carbon component of aerosols in the Mexico City Metropolitan Area, Atmos. Chem. Phys., 8, 6665-6679, doi:10.5194/acp-8-6665-2008, 2008.
12. Bergstrom, R. W., Russell, P. B., and Hignett, P.: Wavelength Dependence of the Absorption of Black Carbon Particles: Predictions and Results from the TARFOX Experiment and Implications for the Aerosol Single Scattering Albedo, J. Atmos. Sci., 59, 567-577, 2002. (Pubitemid 34838323)
13. Bergstrom, R. W., Pilewskie, P., Russell, P. B., Redemann, J., Bond, T. C., Quinn, P. K., and Sierau, B.: Spectral absorption properties of atmospheric aerosols, Atmos. Chem. Phys., 7, 5937-5943, doi:10.5194/acp-7-5937-2007, 2007. (Pubitemid 350212724)
14. Bergstrom, R. W., Schmidt, K., Coddington, O., Pilewskie, P., Guan, H., Livingston, J., Redemann, J., and Russell, P. B.: Aerosol spectral absorption in the Mexico City area: results from airborne measurements during MILAGRO/INTEX B, At-mos. Chem. Phys., 10, 6333-6343, doi:10.5194/acp-10-6333-2010, 2010.
15. BGI.: PQ100 Portable PM10/TSP/PM2.5. Prepared by BGI Incorporated, Waltham, MA, USA, http://www.bgiusa.com/aam/portable.htm, last access: 06/09/2011, 2009a.
16. BGI.: PQ200 Ambient Fine Particulate Sampler. Prepared by BGI Incorporated, Waltham, MA, USA, http://www.bgiusa.com/aam/pq200.htm, last access: 06/09/2011, 2009b.
17. Bohren, C. F. and Huffman, D. R.: Absorption and scattering of light by small particles, John Wiley & Sons Inc., 530 pp., 1983.
18. Bond, T. C.: Spectral dependence of visible light absorption by carbonaceous particles emitted from coal combustion, Geophys. Res. Lett., 28, 4075-4078, 2001. (Pubitemid 33122454)
19. Bond, T. C. and Bergstrom, R. W.: Light absorption by carbona-ceous particles: An investigative review, Aerosol Sci. Tech., 40, 27-67, 2006.
20. Chakrabarty, R. K., Moosmüller, H., Chen, L.-W. A., Lewis, K., Arnott, W. P., Mazzoleni, C., Dubey, M. K., Wold, C. E., Hao,W. M., and Kreidenweis, S. M.: Brown carbon in tar balls from smoldering biomass combustion, Atmos. Chem. Phys., 10, 6363-6370, doi:10.5194/acp-10-6363-2010, 2010.
21. Chen, L.-W. A., Verburg, P., Shackelford, A., Zhu, D., Susfalk, R., Chow, J. C., and Watson, J. G.: Moisture effects on carbon and nitrogen emission from burning of wildland biomass, Atmos. Chem. Phys., 10, 6617-6625, doi:10.5194/acp-10-6617-2010, 2010.
22. Chen, C.-L., Tsuang, B.-J., Tu, C.-Y., Cheng, W.-L., and Lin, M.-D.: Wintertime vertical profiles of air pollutants over a suburban area in central Taiwan, Atmos. Environ, 36, 2049-2059, 2002. (Pubitemid 34626187)
23. Chow, J. C. and Watson, J. G., Lowenthal, D. H., Chen, L.-W. A., Tropp, R. J., Park, K., and Magliano, K. L.: PM2.5 and PM10 mass measurements in California's San Joaquin Valley, Aerosol Sci. Technol., 40, 796-810, 2006. (Pubitemid 44034533)
24. Clarke, A. D., Noone, K. J., Heintzenberg, J., Warren, S. G., and Covert, D. S.: Aerosol light absorption measurement techniques: Analysis and intercomparisons, Atmos. Environ, 21, 1455-1465, doi:10.1016/0004-6981(67)90093- 5, 1987. (Pubitemid 17116802)
25. Corr, C., Krotkov, N., Madronich, S., Slusser, J., Holben, B., Gao, W., Flynn, J., Lefer, B., and Kreidenweis, S.: Retrieval of aerosol single scattering albedo at ultraviolet wavelengths at the T1 site during MILAGRO, Atmos. Chem. Phys., 9, 5813-5827, doi:10.5194/acp-9-5813-2009, 2009.
26. Crosier, J., Allan, J. D., Coe, H., Bower, K. N., Formenti, P., and Williams, P. I.: Chemical composition of summertime aerosol in the Po Valley (Italy), northern Adriatic and Black Sea, Q. J. R. Meteorol. Soc., 133, 61-75, doi:10.1002/qj.88, 2007. (Pubitemid 350001990)
27. D'Alessio, A., D'Anna, A., Gambi, G., and Minutolo, P.: The spec-troscopic characterization of UV absorbing nanoparticles in fuel rich soot forming flames, J. Aerosol Sci, 29, 397-409, 1998. (Pubitemid 28185361)
28. Dubovik, O., Holben, B., Eck, T. F., Smirnov, A., Kaufman, Y., King, M. D., Tanre, D., and Slutsker, I.: Variability of absorption and optical properties of key aerosol types observed in worldwide locations, J. Atmos. Sci., 59, 590-608, 2002. (Pubitemid 34838293)
29. Eck, T. F., Holben, B. N., Reid, J. S., Dubovik, O., Smirnov, A., O'Neill, N. T., Slutsker, I., and Kinne, S.: Wavelength dependence of the optical depth of biomass burning, urban, and desert dust aerosols, J. Geophys. Res., 104, 31333-31349, 1999.
30. Flowers, B. A., Dubey, M. K., Mazzoleni, C., Stone, E. A., Schauer, J. J., Kim, S.-W., and Yoon, S. C.: Optical-chemical-microphysical relationships and closure studies for mixed carbonaceous aerosols observed at Jeju Island; 3-laser photoa-coustic spectrometer, particle sizing, and filter analysis, Atmos. Chem. Phys., 10, 10387-10398, doi:10.5194/acp-10-10387-2010, 2010.
31. Grisdale, R. O.: The formation of black carbon, J. Appl. Phys, 24, 1082-1091, doi:10.1063/1.1721452, 1953.
32. Gillis, K. A., Havey, D. K., and Hodges, J. T.: Standard photoacous-tic spectrometer: Model and validation using O2 A-band spectra, Rev. Sci. Instrum., 81, 064902-1, 064902-13, 2010.
33. Gyawali, M., Arnott, W. P., Lewis, K., and Moosmüller, H.: In situ aerosol optics in Reno, NV, USA during and after the summer 2008 California wildfires and the influence of absorbing and non-absorbing organic coatings on spectral light absorption, Atmos. Chem. Phys., 9, 8007-8015, doi:10.5194/acp-9-8007-2009, 2009.
34. Hansen, J., Johnson, D., Lacis, A., Lebedeff, S., Lee, P., Rind, D., and Russell, G.: Climate Impact of Increasing Atmospheric Carbon Dioxide, Science, 213, 957-966, doi:10.1126/science.213.4511.957, 1981. (Pubitemid 12259026)
35. Hoffer, A., Gelencser, A., Guyon, P., Kiss, G., Schmid, O., Frank, G. P., Artaxo, P., and Andreae, M. O.: Optical properties of humic-like substances (HULIS) in biomass-burning aerosols, At-mos. Phys. Chem., 6, 3563-3570, doi:10.5194/acp-6-3563-2006, 2006. (Pubitemid 44326773)
36. Hofzumahaus, A., Kraus, A., Kylling, A., and Zerefos, C. S.: Solar actinic radiation (280-420 nm) in the cloud-free troposphere between ground and 12 km altitude: Measurements and model results, J. Geophys. Res., 107, doi:200210.1029/2001JD900142, 2002.
37. Horvath, H.: Atmospheric light absorption-A review, Atmos. Environ., 27, 293-317, 1993.
38. Huang, C. H. and Tai, C. Y.: Relative humidity effect on PM2.5 readings recorded by collocated beta attenuation monitors. Environmental Engineering Science, 25, 1079-1089. ISI:000259125600013, 2008.
39. Jacobson, M. Z.: Isolating nitrated and aromatic aerosols and nitrated aromatic gases as sources of ultraviolet light absorption, J. Geophys. Res., 104, 3527-3542, 1999. (Pubitemid 29298430)
40. Jacobson, M. C., Hansson, H.-C., Noone, K. J., and Charlson, R. J.: Organic atmospheric aerosols: Review and state of the science, Rev. Geophys., 38, 267-294, 2000. (Pubitemid 32200848)
41. Ji, X., Le Bihan, O., Ramalho, O., Mandin, C., D'Anna, B., Mar-tinon, L., Nicolas, M., Bard, D., and Pairon, J.-C.: Characterization of particles emitted by incense burning in an experimental house, Indoor Air, 20, 147-158, doi:10.1111/j.1600-0668.2009.00634.x, 2010.
42. Kikas, U., Reinart, A., Vaht, M., and Veismann, U.: A case study of the impact of boundary layer aerosol size distribution on the surface UV irradiance, Atmos. Environ., 35, 5041-5051, 2001. (Pubitemid 32846566)
43. Kirchstetter, T. W., Harley, R. A., Kreisberg, N. M., Stolzenburg, M. R., and Hering, S. V.: On-road measurements of fine particle and nitrogen oxide emissions from light-and heavy-duty motor vehicles, Atmos. Environ.,33, 2955-2968, 1999. (Pubitemid 29222770)
44. Kirchstetter, T. W., Novakov, T., and Hobbs, P. V.: Evidence that the spectral dependence of light absorption by aerosols is affected by organic carbon, J. Geophys. Res., 109, D21208, doi:10.1029/2004JD004999, 2004. (Pubitemid 40191167)
45. Lack, D. A. and Cappa, C. D.: Impact of brown and clear carbon on light absorption enhancement, single scatter albedo and absorption wavelength dependence of black carbon, Atmos. Chem. Phys., 10, 4207-4220, doi:10.5194/acp-10-4207-2010, 2010.
46. Levoni, C., Cervino, M., Guzzi, R., and Torricella, F.: Atmospheric aerosol optical properties: a database of radiative characteristics for different components and classes, Appl. Opt., 36, 8031-8041, 1997. (Pubitemid 28558400)
47. Lewis, K., Arnott, W. P., Moosmüller, H., and Wold, C. E.: Strong spectral variation of biomass smoke light absorption and single scattering albedo observed with a novel dual-wavelength photoacoustic instrument, J. Geophys. Res., 113, D16203, doi:10.1029/2007JD009699, 2008.
48. Lewis, K. A., Arnott, W. P, Moosmüller, H., Chakrabarty, R. K., Carrico, C. M, Kreidenweis, S. M., Day, D. E., Malm, W. C., Laskin, A., Jimenez, J. L., Ulbrich, I. M. Huffman, J. A., Onasch, T. B.,Trimborn, A., Lui, L., and Mishchenko, M. I.: Reduction in Biomass Burning Aerosol Light Absorption upon Humidification: Roles of Inorganically-Induced Hygroscopic-ity, Particle Collapse, and Photoacoustic Heat and Mass Transfer. Atm. Chem. Phys., 9, 8949-8966, doi:10.5194/acp-9-8949-2009, 2009.
49. Lloyd, A. C. and Cackette, T. A.: Critical review-Diesel engines: Environmental impact and control, J. Air Waste Manage. Assoc., 51, 809-847, 2001. (Pubitemid 32664495)
50. Martins, J. V., Artaxo, P., Kaufman, Y. J., Castanho, A. D., and Remer, L. A.: Spectral absorption properties of aerosol particles from 350-2500 nm, Geophys. Res. Lett., 36, L13810, doi:200910.1029/2009GL037435, 2009.
51. Moosmüller, H. and Arnott, W. P.: Particle Optics in the Rayleigh Regime, J. Air Waste Manage., 59, 1028-1031, 2009.
52. Moosmüller, H. and Chakrabarty, R. K.: Technical Note: Simple analytical relationships between A? ngström coefficients of aerosol extinction, scattering, absorption, and single scattering albedo, Atmos. Chem. Phys., 11, 10677-10680, doi:10.5194/acp-11-10677-2011, 2011.
53. Moosmüller, H., Arnott, W. P., Rogers, C. F., Chow, J. C., Frazier, C. A., Sherman, L. E., and Dietrich, D. L.: Photoacoustic and filter measurements related to aerosol light absorption during the Northern Front Range Air Quality Study (Colorado 1996/1997), J. Geophys. Res., 103, doi:10.1029/98JD02618, 1998.
54. Moosmüller, H., Chakrabarty, R. K., and Arnott, W. P.: Aerosol light absorption and its measurement: A review, J. Quant. Spec-trosc. Radiat. Transfer, 110, 844-878, 2009.
55. Moosmüller, H., Chakrabarty, R. K., Ehlers, K. M., and Arnott, W. P.: Absorption A? ngström coefficient, brown carbon, and aerosols: basic concepts, bulk matter, and spherical particles, Atmos. Chem. Phys., 11, 1217-1225, doi:10.5194/acp-11-1217-2011, 2011.
56. Paredes-Miranda, G., Arnott, W. P., Jimenez, J. L., Aiken, A. C., Gaffney, J. S., and Marley, N. A.: Primary and secondary contributions to aerosol light scattering and absorption in Mexico City during the MILAGRO 2006 campaign, Atmos. Chem. Phys., 9, 3721-3730, doi:10.5194/acp-9-3721-2009, 2009.
57. Petzold, A. and Schönlinner, M.: Multi-angle absorption photometry-a new method for the measurement of aerosol light absorption and atmospheric black carbon, J. Aerosol Sci., 35, 421-441, 2004. (Pubitemid 38410918)
58. Reid, J. S., Hobbs, P. V., Ferek, R. J., Blake, D. R., Martins, J. V., Dunlap, M. R., and Liousse, C.: Physical, chemical, and optical properties of regional hazes dominated by smoke in Brazil, J. Geophys. Res., 103, 32059-32080, 1998. (Pubitemid 128665622)
59. Reid, J. S., Eck, T., Christopher, S., Hobbs, P. V., and Holben, B. N.: Use of the Angstrom exponent to estimate the variability of optical and physical properties of aging smoke particles in Brazil, J. Geophys. Res., 104, 27473-27489, 1999.
60. Roden, C. A., Bond, T. C., Conway, S., Benjamin, A., and Pinel, A. B. O.: Emission factors and real-time optical properties of particles emitted from traditional wood burning cookstoves, Environ. Sci. Technol., 40, 6750-6757, 2006. (Pubitemid 44721918)
61. Sandradewi, J., Prévôt, A. S. H., Szidat, S., Perron, N., Alfarra, M. R., Lanz, V. A., Weingartner, E., and Baltensperger, U.: Using aerosol light absorption measurements for the quantitative determination of wood burning and traffic emission contributions to particulate matter, Environ. Sci. Technol., 42, 3316-3323, doi:10.1021/es702253m, 2008a.
62. Sandradewi, J., Prévôt, A. S. H., Weingartner, E., Schmidhauser, R., Gysel, M., and Baltensperger, U.: A study of wood burning and traffic aerosols in an Alpine valley using a multi-wavelength Aethalometer, Atmos. Environ., 42, 101-112, 2008b. (Pubitemid 350298032)
63. Schuster, G. L., Dubovik, O., and Holben, B. N.: Angstrom exponent and bimodal aerosol size distributions, J. Geophys. Res., 111, D07207, doi:10.1029/2005JD006328, 2006.
64. Schwab, J. J., Felton, H. D., Rattigan, O. V., and Demerjian, K. L.: New York state urban and rural measurements of continuous PM2.5 mass by FDMS, TEOM, and BAM, J. Air Waste Manage. Assoc., 56, 372-383, 2006.
65. Schnaiter, M., Gimmler, M., Llamas, I., Linke, C., Jäger, C., and Mutschke, H.: Strong spectral dependence of light absorption by organic carbon particles formed by propane combustion, At-mos. Chem. Phys., 6, 2981-2990, doi:10.5194/acp-6-2981-2006, 2006. (Pubitemid 44100527)
66. Seinfeld, J. H. and Pandis, S. N.: Atmospheric Chemistry and Physics: From Air Pollution to Climate Change, 2nd edn., Wiley, Hoboken, NJ, USA, 2006.
67. Sheridan, P., Arnott, W. P., Ogren, J., Andrews, E., Atkinson, D., Covert, D., Moosmüller, H., Petzold, A., Schmid, B., Strawa, A., Varma, R., and Virkkula: The Reno Aerosol Optics Study: An evaluation of aerosol absorption measurement methods, Aerosol Sci. Tech., 39, 1-16, doi:10.1080/027868290901891, 2005. (Pubitemid 40095658)
68. Silva, P., Vawdrey, E., Corbett, M., and Erupe, M.: Fine particle concentrations and composition during wintertime inversions in Logan, Utah, USA, Atmos. Environ., 41, 5410-5422, doi:10.1016/j.atmosenv.2007.02.016, 2007. (Pubitemid 47043529)
69. Sokolik, I. and Toon, O.: Incorporation of mineralogical composition into models of the radiative properties of mineral aerosol from UV to IR wavelengths, J. Geophys. Res., 104, 9423-9444, 1999. (Pubitemid 29370745)
70. Stephens, S., Madronich, S., Wu, F., Olson, J. B., Ramos, R., Re-tama, A., and Muñoz, R.: Weekly patterns of México City's surface concentrations of CO, NOx, PM10 and O3 during 1986-2007, Atmos. Chem. Phys., 8, 5313-5325, doi:10.5194/acp-8-5313-2008, 2008.
71. Sun, H., Biedermann, L., and Bond, T.: Color of brown carbon: A model for ultraviolet and visible light absorption by organic carbon aerosol, Geophys. Res. Lett. 34, L17813, doi:10.1029/2007GL029797, 2007. (Pubitemid 350065294)
72. Taylor, T., L'Ecuyer, T., Slusser, J., Stephens, G., and Goering, C.: An operational retrieval algorithm for determining aerosol optical properties in the ultraviolet, J. Geophys. Res., 113, D03201, doi:10.1029/2007JD008661, 2008.
73. Tian, G., Moosmüller, H., and Arnott, W. P.: Simultaneous pho-toacoustic spectroscopy of aerosol and oxygen A-band absorption for the calibration of aerosol light absorption measurements, Aerosol. Sci. Technol., 43, 1084-1090, 2009.
74. Van de Hulst, H. C.: Light Scattering by Small Particles, Dover Publications, Inc., New York, USA, 453 pp., 1981.
75. Watson, J. G. and Chow, J. C.: A wintertime PM2.5 episode at the Fresno, CA, supersite, Atmos. Environ, 36, 465-475, 2002. (Pubitemid 34013699)
76. Watson, J. G., Chow, J. C., Chen, L.-W. A., Green, M. C., and Kohl, S. D.: Wintertime PM2.5 source contributions in Reno, NV. A report prepared by Desert Research Institute, Reno, NV, for Washoe County Health District, Air Quality Division, Reno, NV, 2011.
77. Wentzel, M., Gorzawski, H., Naumann, K., Saathoff, H., and Wein-bruch, S.: Transmission electron microscopical and aerosol dynamical characterization of soot aerosols, J. Aerosol Sci., 34, 1347-1370, 2003. (Pubitemid 37163752)
78. Yang, C., Lin, T., and Chang, F.: Particle size distribution and PAH concentrations of incense smoke in a combustion chamber, Environ. Pollut., 145, 606-615, doi:10.1016/j.envpol.2005.10.036, 2007. (Pubitemid 44821481)
79. Zaveri, R. A., Berkowitz, C. M., Brechtel, F. J., Gilles, M. K., Hubbe, J. M., Jayne, J. T., Kleinman, L. I., Laskin, A., Madronich, S., Onasch, T. B., Pekour, M. S., Springston, S. R., Thornton, J. A., Tivanski, A. V., and Worsnop, D. R.: Nighttime chemical evolution of aerosol and trace gases in a power plant plume: Implications for secondary organic nitrate and organosulfate aerosol formation, NO3 radical chemistry, and N2O5 heterogeneous hydrolysis, J. Geophys. Res., 115, D12304, doi:10.1029/2009JD013250, 2010.