Observation of isoprene hydroxynitrates in the southeastern United States and implications for the fate of NOx

Atmospheric Chemistry and Physics

Volumn 15, Issue 19, 2015, Pages 11257-11272

  Xiong, F ^a   McAvey, K M ^a   Pratt, K A ^a,c   Groff, C J ^a   Hostetler, M A ^a   Lipton, M A ^a   Starn, T K ^d   Seeley, J V ^e   Bertman, S B ^f   Teng, A P ^g   Crounse, J D ^h   Nguyen, T B ^h   Wennberg, P O ^g,h   Misztal, P K ⁱ   Goldstein, A H ^i,j   Guenther, A B ^k   Koss, A R ^l,m   Olson, K F ⁱ   De Gouw, J A ^l,m   Baumann, K ⁿ   Edgerton, E S ⁿ   Feiner, P A ^o   Zhang, L ^o   Miller, D O ^o   Brune, W H ^o   Shepson, P B ^a,b   more..

^a PURDUE UNIVERSITY   (United States)

^b PURDUE UNIVERSITY   (United States)

^c UNIVERSITY OF MICHIGAN   (United States)

^d WEST CHESTER UNIVERSITY   (United States)

^e OAKLAND UNIVERSITY   (United States)

^f WESTERN MICHIGAN UNIVERSITY   (United States)

^g California Institute of Technology   (United States)

^h CALIFORNIA INSTITUTE OF TECHNOLOGY   (United States)

ⁱ UNIVERSITY OF CALIFORNIA   (United States)

^j Berkeley   (United States)

^k PACIFIC NORTHWEST NATIONAL LABORATORY   (United States)

^l Cooperative Institute for Research in Environmental Sciences ^*  (United States)

^m NOAA EARTH SYSTEM RESEARCH LABORATORY   (United States)

ⁿ Atmospheric Research and Analysis Inc   (United States)

^o PENNSYLVANIA STATE UNIVERSITY   (United States)

more..

Author keywords

[No Author keywords available]

Indexed keywords

ENVIRONMENTAL FATE; ISOPRENE; NITRATE; NITROGEN OXIDES; PHOTOCHEMISTRY; TROPOSPHERE; VERTICAL MIXING;

UNITED STATES;

EID: 84943796413     PISSN: 16807316     EISSN: 16807324     Source Type: Journal    
DOI: 10.5194/acp-15-11257-2015     Document Type: Article

References (70)

1. Atkinson, R., Aschmann, S. M., Carter, W. P. L., Winer, A. M., and Pitts, J. N.: Alkyl nitrate formation from the nitrogen oxide (NOx)-air photooxidations of C2-C8 n-alkanes, J. Phys. Chem., 86, 4563-4569, doi:10.1021/j100220a022, 1982.
2. Bates, K. H., Crounse, J. D., St Clair, J.M., Bennett, N. B., Nguyen, T. B., Seinfeld, J. H., Stoltz, B. M., and Wennberg, P. O.: Gas phase production and loss of isoprene epoxydiols, J. Phys. Chem. A, 118, 1237-1246, doi:10.1021/jp4107958, 2014.
3. Beaver, M. R., Clair, J. M. St., Paulot, F., Spencer, K. M., Crounse, J. D., La Franchi, B.W., Min, K. E., Pusede, S. E., Wooldridge, P. J., Schade, G. W., Park, C., Cohen, R. C., and Wennberg, P. O.: Importance of biogenic precursors to the budget of organic nitrates: observations of multifunctional organic nitrates by CIMS and TD-LIF during BEARPEX 2009, Atmos. Chem. Phys., 12, 5773-5785, doi:10.5194/acp-12-5773-2012, 2012.
4. x, Int. J. Chem. Kinet., 28, 497-530, doi:10.1002/(SICI)1097-4601(1996)28:7<497::AIDKIN4> 3.0.CO;2-Q, 1996.
5. Chen, X., Hulbert, D., and Shepson, P. B.: Measurement of the organic nitrate yield from OH reaction with isoprene, J. Geophys. Res., 103, 25563, doi:10.1029/98jd01483, 1998.
6. Crounse, J. D., McKinney, K. A., Kwan, A. J., and Wennberg, P. O.: Measurement of Gas-Phase Hydroperoxides by Chemical Ionization Mass Spectrometry, Anal. Chem., 78, 6726-6732, doi:10.1021/ac0604235, 2006.
7. Crounse, J. D., Paulot, F., Kjaergaard, H. G., and Wennberg, P. O.: Peroxy radical isomerization in the oxidation of isoprene, Phys. Chem. Chem. Phys., 13, 13607-13613, doi:10.1039/c1cp21330j, 2011.
8. Crounse, J. D., Nielsen, L. B., Jørgensen, S., Kjaergaard, H. G., and Wennberg, P. O.: Autoxidation of Organic Compounds in the Atmosphere, J. Phys. Chem. Lett., 4, 3513-3520, doi:10.1021/jz4019207, 2013.
9. 3, J. Geophys. Res.-Atmos., 107, ACH 4-1-ACH 4-14, doi:10.1029/2001JD000779, 2002.
10. Fan, J. and Zhang, R.: Atmospheric Oxidation Mechanism of Isoprene, Environ. Chem., 1, 140, doi:10.1071/en04045, 2004.
11. Giacopelli, P., Ford, K., Espada, C., and Shepson, P. B.: Comparison of the measured and simulated isoprene nitrate distributions above a forest canopy, J. Geophys. Res., 110, D01304, doi:10.1029/2004jd005123, 2005.
12. Gilman, J. B., Burkhart, J. F., Lerner, B. M., Williams, E. J., Kuster, W. C., Goldan, P. D., Murphy, P. C., Warneke, C., Fowler, C., Montzka, S. A., Miller, B. R., Miller, L., Oltmans, S. J., Ryerson, T. B., Cooper, O. R., Stohl, A., and de Gouw, J. A.: Ozone variability and halogen oxidation within the Arctic and sub-Arctic springtime boundary layer, Atmos. Chem. Phys., 10, 10223-10236, doi:10.5194/acp-10-10223-2010, 2010.
13. Grosjean, D., Williams, E. L., and Grosjean, E.: Atmospheric chemistry of isoprene and of its carbonyl products, Environ. Sci. Technol., 27, 830-840, doi:10.1021/es00042a004, 1993.
14. Grossenbacher, J. W., Couch, T., Shepson, P. B., Thornberry, T., Witmer-Rich, M., Carroll, M. A., Faloona, I., Tan, D., Brune, W., Ostling, K., and Bertman, S.: Measurements of isoprene nitrates above a forest canopy, J. Geophys. Res., 106, 24429, doi:10.1029/2001jd900029, 2001.
15. Grossenbacher, J. W., Barket Jr., D. J., Shepson, P. B., Carroll, M. A., Olszyna, K., and Apel, E.: A comparison of isoprene nitrate concentrations at two forest-impacted sites, J. Geophys. Res.- Atmos., 109, D11311, doi:10.1029/2003JD003966, 2004.
16. Guenther, A., Karl, T., Harley, P., Wiedinmyer, C., Palmer, P. I., and Geron, C.: Estimates of global terrestrial isoprene emissions using MEGAN (Model of Emissions of Gases and Aerosols from Nature), Atmos. Chem. Phys., 6, 3181-3210, doi:10.5194/acp-6-3181-2006, 2006.
17. Hao, C., Shepson, P. B., Drummond, J.W., and Muthuramu, K.: Gas Chromatographic Detector for Selective and Sensitive Detection of Atmospheric Organic Nitrates, Anal. Chem., 66, 3737-3743, doi:10.1021/ac00093a032, 1994.
18. y at the rural Southern Oxidants Study site in central Piedmont, North Carolina, site SONIA, J. Geophys. Res.-Atmos., 99, 21033-21041, doi:10.1029/94JD01021, 1994.
19. Harwood, L. M., Casy, G., and Sherlock, J.: A Simple Laboratory Procedure for Preparation of (1-Methylethenyl)oxirane (3,4-Epoxyisoprene), Synthetic Commun., 20, 1287-1292, doi:10.1080/00397919008052839, 1990.
20. Hasson, A. S., Tyndall, G. S., and Orlando, J. J.: A Product Yield Study of the Reaction of HO2 Radicals with Ethyl Peroxy (C2H5O2), Acetyl Peroxy (CH3C(O)O2), and Acetonyl Peroxy (CH3C(O)CH2O2) Radicals, J. Phys. Chem. A, 108, 5979-5989, doi:10.1021/jp048873t, 2004.
21. Hasson, A. S., Kuwata, K. T., Arroyo, M. C., and Petersen, E. B.: Theoretical studies of the reaction of hydroperoxy radicals (HO2) with ethyl peroxy (CH3CH2O2), acetyl peroxy (CH3C(O)O2), and acetonyl peroxy (CH3C(O)CH2O2) radicals, J. Photochem. Photobiol. A, 176, 218-230, doi:10.1016/j.jphotochem.2005.08.012, 2005.
22. Hasson, A. S., Tyndall, G. S., Orlando, J. J., Singh, S., Hernandez, S. Q., Campbell, S., and Ibarra, Y.: Branching ratios for the reaction of selected carbonyl-containing peroxy radicals with hydroperoxy radicals, J. Phys. Chem. A, 116, 6264-6281, doi:10.1021/jp211799c, 2012.
23. Hastie, D. R., Shepson, P. B., Sharma, S., and Schiff, H. I.: The influence of the nocturnal boundary layer on secondary trace species in the atmosphere at Dorset, Ontario, Atmos. Environ. A, 27, 533-541, doi:10.1016/0960-1686(93)90210-P, 1993.
24. Hidy, G. M., Blanchard, C. L., Baumann, K., Edgerton, E., Tanenbaum, S., Shaw, S., Knipping, E., Tombach, I., Jansen, J., and Walters, J.: Chemical climatology of the southeastern United States, 1999-2013, Atmos. Chem. Phys., 14, 11893-11914, doi:10.5194/acp-14-11893-2014, 2014.
25. Horowitz, L. W., Fiore, A. M., Milly, G. P., Cohen, R. C., Perring, A., Wooldridge, P. J., Hess, P. G., Emmons, L. K., and Lamarque, J.-F.: Observational constraints on the chemistry of isoprene nitrates over the eastern United States, J. Geophys. Res., 112, D12S08, doi:10.1029/2006jd007747, 2007.
26. Hu, K. S., Darer, A. I., and Elrod, M. J.: Thermodynamics and kinetics of the hydrolysis of atmospherically relevant organonitrates and organosulfates, Atmos. Chem. Phys., 11, 8307-8320, doi:10.5194/acp-11-8307-2011, 2011.
27. Jacobs, M. I., Burke, W. J., and Elrod, M. J.: Kinetics of the reactions of isoprene-derived hydroxynitrates: gas phase epoxide formation and solution phase hydrolysis, Atmos. Chem. Phys., 14, 8933-8946, doi:10.5194/acp-14-8933-2014, 2014.
28. Jenkin, M. E., Saunders, S. M., and Pilling, M. J.: The tropospheric degradation of volatile organic compounds: a protocol for mechanism development, Atmos. Environ., 31, 81-104, doi:10.1016/S1352-2310(96)00105-7, 1997.
29. 3-initiated oxidation of isoprene, Atmos. Chem. Phys., 12, 7499-7515, doi:10.5194/acp-12-7499-2012, 2012.
30. Lee, B. H., Lopez-Hilfiker, F. D., Mohr, C., Kurtén, T., Worsnop, D. R., and Thornton, J. A.: An Iodide-Adduct High-Resolution Time-of-Flight Chemical-Ionization Mass Spectrometer: Application to Atmospheric Inorganic and Organic Compounds, Environ. Sci. Technol., 48, 6309-6317, doi:10.1021/es500362a, 2014a.
31. Lee, L., Teng, A. P., Wennberg, P. O., Crounse, J. D., and Cohen, R. C.: On rates and mechanisms of OH and O3 reactions with isoprene-derived hydroxy nitrates, J. Phys. Chem. A, 118, 1622-1637, doi:10.1021/jp4107603, 2014b.
32. Lee, B. H., Mohr, C., Lopez-Hilfiker, F. D., D'Ambro1, E. L., Lutz, A., Hallquist, M., Lee, L., Romer, P., Cohen, R. C., Iyer, S., Kurten, T., Hu, W.W., Day, D. A., Campuzano-Jost, P., Jimenez, J. L., Xu, L., Ng, N. L., Wild, R. J., Brown, S. S., Koss, A., Gouw, J. d., Olson, K., Goldstein, A. H., Seco, R., Kim, S., McAvey, K., Shepson, P. B., Baumann, K., Edgerton, E. S., Nguyen, T. B., Wennberg, P. O., Liu, J., Shilling, J. E., and Thornton, J. A.: Highly functionalized particle-phase organic nitrates observed in the Southeastern U.S.: contribution to secondary organic aerosol and reactive nitrogen budgets, in preparation, 2015.
33. Liao, J., Sihler, H., Huey, L. G., Neuman, J. A., Tanner, D. J., Friess, U., Platt, U., Flocke, F. M., Orlando, J. J., Shepson, P. B., Beine, H. J., Weinheimer, A. J., Sjostedt, S. J., Nowak, J. B., Knapp, D. J., Staebler, R. M., Zheng, W., Sander, R., Hall, S. R., and Ullmann, K.: A comparison of Arctic BrO measurements by chemical ionization mass spectrometry and long path-differential optical absorption spectroscopy, J. Geophys. Res., 116, D00R02, doi:10.1029/2010jd014788, 2011.
34. Liu, Y. J., Herdlinger-Blatt, I., McKinney, K. A., and Martin, S. T.: Production of methyl vinyl ketone and methacrolein via the hydroperoxyl pathway of isoprene oxidation, Atmos. Chem. Phys., 13, 5715-5730, doi:10.5194/acp-13-5715-2013, 2013.
35. Lockwood, A. L., Shepson, P. B., Fiddler, M. N., and Alaghmand, M.: Isoprene nitrates: preparation, separation, identification, yields, and atmospheric chemistry, Atmos. Chem. Phys., 10, 6169-6178, doi:10.5194/acp-10-6169-2010, 2010.
36. Madronich, S. and Flocke, S.: The role of solar radiation in atmospheric chemistry, in: Handbook of Environmental Chemistry, edited by: Boule, P., Springer-Verlag, Heidelberg, 1-26, 1998.
37. Mielke, L. H., Pratt, K. A., Shepson, P. B., McLuckey, S. A., Wisthaler, A., and Hansel, A.: Quantitative Determination of Biogenic Volatile Organic Compounds in the Atmosphere Using Proton-Transfer Reaction Linear Ion Trap Mass Spectrometry, Anal. Chem., 82, 7952-7957, doi:10.1021/ac1014244, 2010.
38. Misztal, P. K., Guenther, A., and Goldstein, A. H.: Flux observations of isoprene oxidation products above forests point to potential role of leaf-surface reactions, in preparation, 2015.
39. Neu, U., Künzle, T., and Wanner, H.: On the relation between ozone storage in the residual layer and daily variation in near-surface ozone concentration - A case study, Bound.-Lay. Meteorol., 69, 221-247, doi:10.1007/BF00708857, 1994.
40. Nguyen, T. B., Coggon, M. M., Bates, K. H., Zhang, X., Schwantes, R. H., Schilling, K. A., Loza, C. L., Flagan, R. C., Wennberg, P. O., and Seinfeld, J. H.: Organic aerosol formation from the reactive uptake of isoprene epoxydiols (IEPOX) onto nonacidified inorganic seeds, Atmos. Chem. Phys., 14, 3497-3510, doi:10.5194/acp-14-3497-2014, 2014a.
41. Nguyen, T. B., Crounse, J. D., Schwantes, R. H., Teng, A. P., Bates, K. H., Zhang, X., St. Clair, J. M., Brune, W. H., Tyndall, G. S., Keutsch, F. N., Seinfeld, J. H., and Wennberg, P. O.: Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds, Atmos. Chem. Phys., 14, 13531-13549, doi:10.5194/acp-14-13531-2014, 2014b.
42. Nguyen, T. B., Crounse, J. D., Teng, A. P., St Clair, J. M., Paulot, F., Wolfe, G. M., and Wennberg, P. O.: Rapid deposition of oxidized biogenic compounds to a temperate forest, P. Natl. Acad. Sci. USA, 112,. E392-E401, doi:10.1073/pnas.1418702112, 2015.
43. O'Brien, J. M., Shepson, P. B., Muthuramu, K., Hao, C., Niki, H., Hastie, D. R., Taylor, R., and Roussel, P. B.: Measurements of alkyl and multifunctional organic nitrates at a rural site in Ontario, J. Geophys. Res.-Atmos., 100, 22795-22804, doi:10.1029/94JD03247, 1995.
44. Patchen, A. K., Pennino, M. J., Kiep, A. C., and Elrod, M. J.: Direct kinetics study of the product-forming channels of the reaction of isoprene-derived hydroxyperoxy radicals with NO, Int. J. Chem. Kinet., 39, 353-361, doi:10.1002/kin.20248, 2007.
45. Paulot, F., Crounse, J. D., Kjaergaard, H. G., Kroll, J. H., Seinfeld, J. H., and Wennberg, P. O.: Isoprene photooxidation: new insights into the production of acids and organic nitrates, Atmos. Chem. Phys., 9, 1479-1501, doi:10.5194/acp-9-1479-2009, 2009.
46. Paulot, F., Henze, D. K., and Wennberg, P. O.: Impact of the isoprene photochemical cascade on tropical ozone, Atmos. Chem. Phys., 12, 1307-1325, doi:10.5194/acp-12-1307-2012, 2012.
47. Peeters, J., Nguyen, T. L., and Vereecken, L.: HOx radical regeneration in the oxidation of isoprene, Phys. Chem. Chem. Phys., 11, 5935-5939, doi:10.1039/b908511d, 2009.
48. Peeters, J., Müller, J.-F., Stavrakou, T., and Nguyen, V. S.: Hydroxyl Radical Recycling in Isoprene Oxidation Driven by Hydrogen Bonding and Hydrogen Tunneling: The Upgraded LIM1 Mechanism, J. Phys. Chem. A, 118, 8625-8643, doi:10.1021/jp5033146, 2014.
49. 3 reaction, Atmos. Chem. Phys., 9, 4945-4956, doi:10.5194/acp-9-4945-2009, 2009.
50. Rindelaub, J. D., McAvey, K. M., and Shepson, P. B.: The photochemical production of organic nitrates from α-pinene and loss via acid-dependent particle phase hydrolysis, Atmos. Environ., 100, 193-201, doi:10.1016/j.atmosenv.2014.11.010, 2015.
51. Rivera-Rios, J. C., Nguyen, T. B., Crounse, J. D., Jud, W., St. Clair, J. M., Mikoviny, T., Gilman, J. B., Lerner, B. M., Kaiser, J. B., de Gouw, J., Wisthaler, A., Hansel, A., Wennberg, P. O., Seinfeld, J. H., and Keutsch, F. N.: Conversion of hydroperoxides to carbonyls in field and laboratory instrumentation: Observational bias in diagnosing pristine versus anthropogenically controlled atmospheric chemistry, Geophys. Res. Lett., 41, 8645-8651, doi:10.1002/2014gl061919, 2014.
52. Rollins, A. W., Kiendler-Scharr, A., Fry, J. L., Brauers, T., Brown, S. S., Dorn, H.-P., Dubé, W. P., Fuchs, H., Mensah, A., Mentel, T. F., Rohrer, F., Tillmann, R., Wegener, R., Wooldridge, P. J., and Cohen, R. C.: Isoprene oxidation by nitrate radical: alkyl nitrate and secondary organic aerosol yields, Atmos. Chem. Phys., 9, 6685-6703, doi:10.5194/acp-9-6685-2009, 2009.
53. Rollins, A. W., Smith, J. D., Wilson, K. R., and Cohen, R. C.: Real Time In Situ Detection of Organic Nitrates in Atmospheric Aerosols, Environ. Sci. Technol., 44, 5540-5545, doi:10.1021/es100926x, 2010.
54. Saunders, S. M., Jenkin, M. E., Derwent, R. G., and Pilling, M. J.: Protocol for the development of the Master Chemical Mechanism, MCM v3 (Part A): tropospheric degradation of nonaromatic volatile organic compounds, Atmos. Chem. Phys., 3, 161-180, doi:10.5194/acp-3-161-2003, 2003.
55. Savee, J. D., Papajak, E., Rotavera, B., Huang, H., Eskola, A. J., Welz, O., Sheps, L., Taatjes, C. A., Zádor, J., and Osborn, D. L.: Direct observation and kinetics of a hydroperoxyalkyl radical (QOOH), Science, 347, 643-646, doi:10.1126/science.aaa1495, 2015.
56. 2 Pathway, J. Phys. Chem. A, doi:10.1021/acs.jpca.5b06355, 2015.
57. So, S., Kirk, B. B., Trevitt, A. J., Wille, U., Blanksby, S. J., and da Silva, G.: Unimolecular reaction chemistry of a chargetagged beta-hydroxyperoxyl radical, Phys. Chem. Chem. Phys., 16, 24954-24964, doi:10.1039/C4CP02981J, 2014.
58. Sprengnether, M., Demerjian, K. L., Donahue, N. M., and Anderson, J. G.: Product analysis of the OH oxidation of isoprene and 1,3-butadiene in the presence of NO, J. Geophys. Res., 107, ACH 8-1-ACH 8-13, doi:10.1029/2001jd000716, 2002.
59. St. Clair, J. M., Rivera, J. C., Crounse, J. D., Knap, H. C., Bates, K. H., Teng, A. P., Jørgensen, S., Kjaergaard, H. G., Keutsch, F. N., and Wennberg, P. O.: Kinetics and Products of the Reaction of the First-Generation Isoprene Hydroxy Hydroperoxide (ISOPOOH) with OH, J. Phys. Chem. A, doi:10.1021/acs.jpca.5b06532, 2015.
60. Stevens, P., L'Esperance, D., Chuong, B., and Martin, G.: Measurements of the kinetics of the OH-initiated oxidation of isoprene: Radical propagation in the OH + isoprene + O2 + NO reaction system, Int. J. Chem. Kinet., 31, 637-643, doi:10.1002/(SICI)1097-4601(1999)31:9<637::AIDKIN5> 3.0.CO;2-O, 1999.
61. Stutz, J.: Vertical profiles of NO3, N2O5, O3, and NOxin the nocturnal boundary layer: 1. Observations during the Texas Air Quality Study 2000, J. Geophys. Res., 109, D12306, doi:10.1029/2003jd004209, 2004.
62. Surratt, J. D., Chan, A. W., Eddingsaas, N. C., Chan, M., Loza, C. L., Kwan, A. J., Hersey, S. P., Flagan, R. C., Wennberg, P. O., and Seinfeld, J. H.: Reactive intermediates revealed in secondary organic aerosol formation from isoprene, P. Natl. Acad. Sci. USA, 107, 6640-6645, doi:10.1073/pnas.0911114107, 2010a.
63. Surratt, J. D., Chan, A.W. H., Eddingsaas, N. C., Chan, M., Loza, C. L., Kwan, A. J., Hersey, S. P., Flagan, R. C., Wennberg, P. O., and Seinfeld, J. H.: Reactive intermediates revealed in secondary organic aerosol formation from isoprene, P. Natl. Acad. Sci. USA, 107, 6640-6645, doi:10.1073/pnas.0911114107, 2010b.
64. Teng, A. P., Crounse, J. D., Lee, L., St. Clair, J. M., Cohen, R. C., and Wennberg, P. O.: Hydroxy nitrate production in the OHinitiated oxidation of alkenes, Atmos. Chem. Phys., 15, 4297-4316, doi:10.5194/acp-15-4297-2015, 2015.
65. x, Int. J. Chem. Kinet., 22, 1221-1236, doi:10.1002/kin.550221202, 1990.
66. Xie, Y., Paulot, F., Carter, W. P. L., Nolte, C. G., Luecken, D. J., Hutzell, W. T., Wennberg, P. O., Cohen, R. C., and Pinder, R.W.: Understanding the impact of recent advances in isoprene photooxidation on simulations of regional air quality, Atmos. Chem. Phys., 13, 8439-8455, doi:10.5194/acp-13-8439-2013, 2013.
67. Xu, L., Guo, H., Boyd, C. M., Klein, M., Bougiatioti, A., Cerully, K. M., Hite, J. R., Isaacman-Van Wertz, G., Kreisberg, N. M., Knote, C., Olson, K., Koss, A., Goldstein, A. H., Hering, S. V., de Gouw, J., Baumann, K., Lee, S. H., Nenes, A., Weber, R. J., and Ng, N. L.: Effects of anthropogenic emissions on aerosol formation from isoprene and monoterpenes in the southeastern United States, P. Natl. Acad. Sci. USA, 112, 37-42, doi:10.1073/pnas.1417609112, 2015a.
68. Xu, L., Suresh, S., Guo, H., Weber, R. J., and Ng, N. L.: Aerosol characterization over the southeastern United States using highresolution aerosol mass spectrometry: spatial and seasonal variation of aerosol composition and sources with a focus on organic nitrates, Atmos. Chem. Phys., 15, 7307-7336, doi:10.5194/acp- 15-7307-2015, 2015b.
69. Zhang, L., Moran, M. D., Makar, P. A., Brook, J. R., and Gong, S.: Modelling gaseous dry deposition in AURAMS: a unified regional air-quality modelling system, Atmos. Environ., 36, 537-560, doi:10.1016/S1352-2310(01)00447-2, 2002.
70. Zhao, J. and Zhang, R.: A theoretical investigation of nitrooxyalkyl peroxy radicals from NO3-initiated oxidation of isoprene, Atmos. Environ., 42, 5849-5858, doi:10.1016/j.atmosenv.2007.09.023, 2008.