Nitrogen, Aerosol Composition, and Halogens on a Tall Tower (NACHTT): Overview of a wintertime air chemistry field study in the front range urban corridor of Colorado

Journal of Geophysical Research Atmospheres

Volumn 118, Issue 14, 2013, Pages 8067-8085

  Brown, Steven S ^a   Thornton, Joel A ^b   Keene, William C ^c   Pszenny, Alexander A P ^d   Sive, Barkley C ^d,e   Dubé, William P ^a,f   Wagner, Nicholas L ^a,f   Young, Cora J ^a,f,g   Riedel, Theran P ^b   Roberts, James M ^a   Vandenboer, Trevor C ^g,h   Bahreini, Roya ^a,f,i   Öztürk, Fatma ^a,j   Middlebrook, Ann M ^a   Kim, Saewung ^k,l   Hübler, Gerhard ^a,f   Wolfe, Daniel E ^a  

^a EARTH SYSTEM RESEARCH LABORATORY   (United States)

^b UNIVERSITY OF WASHINGTON   (United States)

^c UNIVERSITY OF VIRGINIA   (United States)

^d UNIVERSITY OF NEW HAMPSHIRE   (United States)

^e APPALACHIAN STATE UNIVERSITY   (United States)

^f UNIVERSITY OF COLORADO   (United States)

^g MEMORIAL UNIVERSITY OF NEWFOUNDLAND   (Canada)

^h UNIVERSITY OF TORONTO   (Canada)

ⁱ UNIVERSITY OF CALIFORNIA   (United States)

^j ABANT IZZET BAYSAL UNIVERSITY   (Turkey)

^k NATIONAL CENTER FOR ATMOSPHERIC RESEARCH   (United States)

^l UNIVERSITY OF CALIFORNIA   (United States)

more..

Author keywords

aerosols; halogens; NACHTT; nitrogen oxides; winter air quality

Indexed keywords

AIR QUALITY; ATMOSPHERIC CHEMISTRY; CHLORINE COMPOUNDS; FREE RADICALS; GASES; INORGANIC ACIDS; NITROGEN; NITROGEN OXIDES; VOLATILE ORGANIC COMPOUNDS;

ABOVE GROUND LEVEL; AEROSOL COMPOSITION; AEROSOL DISTRIBUTION; DENVER , COLORADO; HALOGENS; IONIC COMPOSITION; NACHTT; OIL AND GAS ACTIVITIES;

AEROSOLS;

AEROSOL; ATMOSPHERIC CHEMISTRY; BOUNDARY LAYER; CHEMICAL COMPOSITION; HYDROXYL RADICAL; NITROGEN COMPOUND; NITROGEN OXIDES; VOLATILE ORGANIC COMPOUND;

COLORADO; UNITED STATES;

EID: 84882784020     PISSN: None     EISSN: 21698996     Source Type: Journal    
DOI: 10.1002/jgrd.50537     Document Type: Article

References (104)

1. Anderson, J. A., D. L. Blumenthal, and, G. J. Sen, (1977), Characterization of Denver's urban plume using an instrumented aircraft, in Denver Air Pollution Study-1973, edited by, P. G. Russsell, pp. 3-34, U.S. Environ. Prot. Agency, Denver, Colo.
2. Bahreini, R., E. J. Dunlea, B. M. Matthew, C. Simons, K. S. Docherty, P. F. DeCarlo, J. L. Jimenez, C. A. Brock, and, A. M. Middlebrook, (2008), Design and operation of a pressure-controlled inlet for airborne sampling with an aerodynamic aerosol lens, Aerosol Sci. Technol., 42 (6), 465-471, doi: 10.1080/0278620802178514.
3. Bahreini, R., et al. (2009), Organic aerosol formation in urban and industrial plumes near Houston and Dallas, Texas, J. Geophys. Res., 114, D00F16, doi: 10.1029/2008JD011493.
4. Baker, A. K., A. J. Beyersdorf, L. A. Doezema, A. S. Katzenstein, S. Meinardi, I. J. Simpson, D. R. Blake, and, F. S. Rowland, (2008), Measurements of nonmethane hydrocarbons in 28 United States cities, Atmos. Environ., 42, 170-182.
5. Baker, K. R., H. Simon, and, J. T. Kelly, (2011), Challenges to modeling cold pool meteorology associated with high pollution episodes, Environ. Sci. Technol., 45 (17), 7118-7119, doi: 10.1021/es202705v.
6. Benedict, K. B., D. Day, F. M. Schwandner, S. M. Kreidenweis, B. Schichtel, W. C. Malm, and, J. L. Collett Jr,. (2013), Observations of atmospheric reactive nitrogen species in Rocky Mountain National Park and across northern Colorado, Atmos. Environ., 64 (0), 66-76, doi: 10.1016/j.atmosenv. 2012.08.066.
7. Bertram, T. H., J. A. Thornton, T. P. Riedel, A. M. Middlebrook, R. Bahreini, T. S. Bates, P. K. Quinn, and, D. J. Coffman, (2009), Direct observations of N2O5 reactivity on ambient aerosol particles, Geophys. Res. Lett., 36, L19803, doi: 10.1029/2009GL040248.
8. Blanken, P. D., J. Dillon, and, G. Wismann, (2001), The impact of an air quality advisory program on voluntary mobile source air pollution reduction, Atmos. Environ., 35 (13), 2417-2421.
9. Brock, C. A., et al. (2011), Characteristics, sources, and transport of aerosols measured in spring 2008 during the aerosol, radiation, and cloud processes affecting Arctic Climate (ARCPAC) Project, Atmos. Chem. Phys., 11 (6), 2423-2453, doi: 10.5194/acp-11-2423-2011.
10. Brodin, M., D. Helmig, and, S. Oltmans, (2010), Seasonal ozone behavior along an elevation gradient in the Colorado Front Range Mountains, Atmos. Environ., 44 (39), 5305-5315.
11. Brown, S. S., et al. (2006a), Nocturnal odd-oxygen budget and its implications for ozone loss in the lower troposphere, Geophys. Res. Lett., 33, L08801, doi: 10.1029/2006GL025900.
12. Brown, S. S., et al. (2006b), Variability in nocturnal nitrogen oxide processing and its role in regional air quality, Science, 311, 67-70.
13. Brown, S. S., W. P. Dubé, H. D. Osthoff, D. E. Wolfe, W. M. Angevine, and, A. R. Ravishankara, (2007), High resolution vertical distributions of NO3 and N2O5 through the nocturnal boundary layer, Atmos. Chem. Phys., 7, 139-149.
14. Brown, S. S., et al. (2009), Reactive uptake coefficients for N 2O5 determined from aircraft measurements during TexAQS 2006: Comparison to current model parameterizations, J. Geophys. Res., 114, D00F10, doi: 10.1029/2008JD011679.
15. Burns, S., S. J. Frey, J. C. Chow, J. G. Watson, and, C. S. Sloane, (1990), An overview of the 1987-88 Metro Denver Brown Cloud Study, in Visibility and Fine Particles, edited by, C. V. Mathai, pp. 363-373, Air and Waste Manage. Assoc., Pittsburgh, Pa.
16. Cai, C., C. Hogrefe, P. Katsafados, G. Kallos, M. Beauharnois, J. J. Schwab, X. Ren, W. H. Brune, X. Zhou, Y. He, and, K. L. Demerjian, (2008), Performance evaluation of an air quality forecast modeling system for a summer and winter season-Photochemical oxidants and their precursosrs, Atmos. Environ., 42, 8585-8599.
17. Carter, W. P. L., and, J. H. Seinfeld, (2012), Winter ozone formation and VOC incremental reactivities in the Upper Green River Basin of Wyoming, Atmos. Environ., 50 (0), 255-266, doi: 10.1016/j.atmosenv.2011.12.025.
18. Chang, W. L., P. V. Bhave, S. S. Brown, N. Riemer, J. Stutz, and, D. Dabdub, (2011), Heterogeneous atmospheric chemistry, ambient measurements, and model calculations of N2O5: A review, Aerosol Sci. Technol., 45, 655-685.
19. Chen, J., Q. Ying, and, M. J. Kleeman, (2010), Source apportionment of wintertime secondary organic aerosol during the California regional PM10/PM2.5 air quality study, Atmos. Environ., 44 (10), 1331-1340.
20. Chen, L. W. A., J. G. Watson, J. C. Chow, M. C. Green, D. Inouye, and, K. Dick, (2012), Wintertime particulate pollution episodes in an urban valley of the Western US: A case study, Atmos. Chem. Phys., 12 (21), 10,051-10,064, doi: 10.5194/acp-12-10,051-10,064.
21. Countess, R. J., G. T. Wolff, and, S. H. Cadle, (1980), The Denver winter aerosol: A comprehensive chemical characterization, J. Air Pollut. Control Assoc., 30 (11), 1194-1200.
22. Countess, R. J., S. H. Cadle, P. J. Groblicki, and, G. T. Wolff, (1981), Chemical analysis of size-segregated samples of Denver's ambient particulate, J. Air Pollut. Control Assoc., 31 (3), 247-252.
23. Crow, L. W., (1977), Airflow study related to EPA field monitoring program Denver metropolitan area November, 1973, in Denver Air Pollution Study-1973, edited by, P. G. Russsell, pp. 3-30, U.S. Environ. Prot. Agency, Denver, Colo.
24. Dentener, F. J., and, P. J. Crutzen, (1993), Reaction of N 2O5 on tropospheric aerosols: Impact on the global distributions of NOx, O3, and OH, J. Geophys. Res., 98 (D4), 7149-7163.
25. Dietrich, D. L., J. V. Molnar, J. F. Faust, and, J. G. Watson, (1990), Transmissometer extinction measurements in an urban environment, in Visibility and Fine Particles, edited by, C. V. Mathai, pp. 374-383, Air and Waste Manage. Assoc., Pittsburg, Pa.
26. Dutton, S. J., B. Rajagopalan, S. Vedal, and, M. P. Hannigan, (2010), Temporal patterns in daily measuremetns of inorganic and organic speciated PM2.5 in Denver, Atmos. Environ., 44, 987-998.
27. Ferman, M. A., G. T. Wolff, and, N. A. Kelly, (1981), An assessment of the gaseous-pollutants and meteorological conditions associated with Denver Brown Cloud, J. Environ. Sci. Health, Part A Environ. Sci. Eng. Toxic Hazard. Subst. Control, 16 (3), 315-339.
28. Finlayson-Pitts, B. J., M. J. Ezell, and, J. N. J. Pitts, (1989), Formation of chemically active chlorine compounds by reactions of atmospheric NaCl particles with gaseous N2O5 and ClONO2, Nature, 337, 241-244.
29. Finlayson-Pitts, B. J., L. M. Wingen, A. L. Sumner, D. Syomin, and, K. A. Ramazan, (2003), The heterogeneous hydrolysis of NO2 in laboratory systems and in outdoor and indoor atmospheres: An integrated mechanism, Phys. Chem. Chem. Phys., 5 (2), 223-242.
30. Fischer, E., and, R. Talbot, (2005), Regional NO3- events in the northeastern United State related to seasonal climate anomalies, Geophys. Res. Lett., 32, L16804, doi: 10.1029/2005GL023490.
31. Fleming, Z. L., P. S. Monks, A. R. Rickard, B. J. Bandy, N. Brough, T. J. Green, C. E. Reeves, and, S. A. Penkett, (2006), Seasonal dependence of peroxy radical concentrations at a northerm hemisphere marine boundary layer site during summer and winter: Evidence for photochemical activity in winter, Atmos. Chem. Phys., 6, 5415-5433.
32. Fuchs, H., W. P. Dubé, B. M. Lerner, N. L. Wagner, E. J. Williams, and, S. S. Brown, (2009), A sensitive and versatile detector for atmospheric NO2 and NOx based on blue diode laser cavity ring-down spectroscopy, Environ. Sci. Technol., 43, 7831-7836.
33. Gilman, J. B., et al. (2009), Measurements of volatile organic compounds during the 2006 TexAQS/GoMACCS campaign: Industrial influences, regional characteristics, and diurnal dependencies of the OH reactivity, J. Geophys. Res., 114, D00F06, doi: 10.1029/2008JD011525.
34. Gilman, J. B., B. M. Lerner, W. C. Kuster, and, J. A. de Gouw, (2013), Source signature of volatile organic compounds from oil and natural gas operations in northeastern Colorado, Environ. Sci. Technol., 47 (3), 1297-1305, 10.1021/es304119a.
35. Groblicki, P. J., G. T. Wolff, and, R. J. Countess, (1981), Visibility-reducing species in the Denver Brown Cloud. 1. Relationships between extinction and chemical-composition, Atmos. Environ., 15 (12), 2473-2484.
36. Haagenson, P. L., (1979), Meteorological and climatological factors affecting Denver air-quality, Atmos. Environ., 13 (1), 79-85.
37. Hahn, C. J., (1981), A study of the diurnal behavior of boundary-layer winds at the Boulder Atmospheric Observatory, Boundary Layer Meteorol., 21 (2), 231-245.
38. Heard, D. E., L. J. Carpenter, D. J. Creasey, J. R. Hopkins, J. D. Lee, A. C. Lewis, M. J. Pilling, and, P. W. Seakins, (2004), High levels of the hydroxyl radical in the winter urban troposphere, Geophys. Res. Lett., 31, L18112, doi: 10.1029/2004GL020544.
39. Houck, J. E., J. M. Goulet, J. C. Chow, J. G. Watson, and, L. C. Pritchett, (1990), Chemical characterization of emission sources contributing to light extinction, in Visibility and Fine Particles, edited by, C. V. Mathai, pp. 437-446, Air and Waste Manage. Assoc., Pittsburgh, Pa.
40. Kaimal, J. C., and, J. E. Gaynor, (1983), The Boulder Atmospheric Observatory, J. Clim. Appl. Meteorol., 22 (5), 863-880.
41. Katzenstein, A. S., L. A. Doezema, I. J. Simpson, D. R. Blake, and, F. S. Rowland, (2003), Extensive regional atmospheric hydrocarbon pollution in the southwestern United States, Proc. Natl. Acad. Sci. U. S. A., 100 (21), 11,975-11,979.
42. Katzman, T. L., A. P. Rutter, J. J. Schauer, G. C. Lough, C. J. Kolb, and, S. Van Klooster, (2010), PM2.5 and PM10-2.5 compositions during wintertime episodes of elevated PM concentrations across the midwestern USA, Aerosol Air Qual. Res., 10, 140-153.
43. Keene, W. C., M. S. Long, A. A. P. Pszenny, R. Sander, J. R. Maben, A. J. Wall, T. L. O'Halloran, A. Kerkweg, E. V. Fischer, and, O. Schrems, (2009), Latitudinal variation in the multiphase chemical processing of inorganic halogens and related species over the eastern North and South Atlantic Oceans, Atmos. Chem. Phys., 9 (19), 7361-7385.
44. Kercher, J. P., T. P. Riedel, and, J. A. Thornton, (2009), Chlorine activation by N2O5: simultaneous, in-situ detection of ClNO2 and N2O5 by chemical ionization mass spectrometry, Atmos. Meas. Tech., 2, 193-204.
45. Kleffmann, J., R. Kurtenbach, J. Lörzer, P. Wiesen, N. Kalthoff, B. Vogel, and, H. Vogel, (2003), Measured and simulated vertical profiles of nitrous acid-Part I: Field measurements, Atmos. Environ., 37, 2949-2955.
46. Klinedinst, D. B., and, L. A. Currie, (1999), Direct quantification of PM2.5 fossil and biomass carbon within the Northern Front Range Air Quality Study's domain, Environ. Sci. Technol., 33 (23), 4146-4154.
47. Koken, P. J. M., W. T. Piver, F. Ye, A. Elixhauser, L. M. Olsen, and, C. J. Portier, (2003), Temperature, air pollution, and hospitalization for cardiovascular diseases among elderly people in Denver, Environ. Health Perspect., 111 (10), 1312-1317.
48. Lawler, M. J., B. D. Finley, W. C. Keene, A. A. P. Pszenny, K. A. Read, R. von Glasow, and, E. S. Saltzman, (2009), Pollution-enhanced reactive chlorine chemistry in the eastern tropical Atlantic boundary layer, Geophys. Res. Lett., 36, L08810, doi: 10.1029/2008GL036666.
49. Levin, E. J. T., S. M. Kreidenwies, G. R. McMeeking, C. M. Carrico, J. L. Collett, and, W. C. Malm, (2009), Aerosol physical, chemical and optical properties during the Rocky Mountain Airborne Nitrogen and Sulfur study, Atmos. Environ., 43, 1932-1939.
50. Levy, H., (1971), Normal atmosphere: Large radical and formaldehyde concentrations predicted, Science, 173, 141-143.
51. Lewis, C. W., R. H. Baumgardner, R. K. Stevens, and, G. M. Russwurm, (1986), Receptor modeling study of Denver winter haze, Environ. Sci. Technol., 20 (11), 1126-1136.
52. Mathur, R., S. Yu, D. Kang, and, K. L. Schere, (2008), Assessment of the wintertime performance of developmental particulate matter forecasts with the Eta-Community Multiscale Air Quality modeling system, J. Geophys. Res., 113, D02303, doi: 10.1029/2007JD008580.
53. McCulloch, A., M. L. Aucott, C. M. Benkovitz, T. E. Graedel, G. Kleiman, P. M. Midgley, and, Y.-F. Li, (1999), Global emissions of hydrogen chloride and chloromethane from coal combustion, incineration and industrial activities: Reactive chlorine emissions inventory, J. Geophys. Res., 104 (D7), 8931-8403, doi: 10.1029/1999JD900025.
54. Mielke, L. H., A. Furgeson, and, H. D. Osthoff, (2011), Observation of ClNO2 in a mid-continental urban environment, Environ. Sci. Technol., 45 (20), 8889-8896, 10.1021/es201955u.
55. Moosmuller, H., W. P. Arnott, C. F. Rogers, J. C. Chow, C. A. Frazier, L. E. Sherman, and, D. L. Dietrich, (1998), Photoacoustic and filter measurements related to aerosol light absorption during the Northern Front Range Air Quality Study (Colorado 1996/1997), J. Geophys. Res., 103 (D21), 28,149-28,157.
56. Nanus, L., D. H. Campbell, G. P. Ingersoll, D. W. Clow, and, M. A. Mast, (2003), Atmospheric deposition maps for the Rocky Mountains, Atmos. Environ., 37 (35), 4881-4892.
57. Neff, W. D., (1997), The Denver Brown Cloud studies from the perspective of model assessment needs and the role of meteorology, J. Air Waste Manage. Assoc., 47 (3), 269-285.
58. Neff, W. D., and, J. G. Watson, (1990), Evaluation of the fuel-switching strategy used on the Denver Brown Cloud Study, in Visibility and Fine Particles, edited by, C. V. Mathai, pp. 410-421, Air and Waste Manage. Assoc., Pittsburgh, Pa.
59. Osthoff, H. D., et al. (2008), High levels of nitryl chloride in the polluted subtropical marine boundary layer, Nat. Geosci., 1, 324-328.
60. Perner, D., and, U. Platt, (1979), Detection of nitrous acid in the atmosphere by differential optical absorption spectroscopy, Geophys. Res. Lett., 6 (2), 971-920.
61. Pétron, G., et al. (2012), Hydrocarbon emissions characterization in the Colorado Front Range: A pilot study, J. Geophys. Res., 117, D04304, 10.1029/2011JD016360.
62. Phillips, G. J., M. J. Tang, J. Thieser, B. Brickwedde, G. Schuster, B. Bohn, J. Lelieveld, and, J. N. Crowley, (2012), Significant concentrations of nitryl chloride observed in rural continental Europe associated with the influence of sea salt chloride and anthropogenic emissions, Geophys. Res. Lett., 39, L10811, doi: 10.1029/2012GL051912.
63. Prospero, J. M., M. Uematsu, and, D. L. Savoie, (1989), Mineral aerosol transport to the Pacific Ocean, in SEAREX: The Sea-Air Exchange Program, Chemical Oceanography, Volume 10, pp. 187-218, edited by, Riley, J. P., R. Chester, and, R. A. Duce, Academic Press, London.
64. Reddy, P. J., D. E. Barbarick, and, R. D. Osterburg, (1995), Development of a statistical-model for forecasting episodes of visibility degradation in the Denver Metropolitan-Area, J. Appl. Meteorol., 34 (3), 616-625.
65. Ren, X., et al. (2006), Behavior of OH and HO2 in the winter atmosphere in New York City, Atmos. Environ., 40, suppl. 2, S252-S263.
66. Richards, L. W., C. S. Sloane, J. G. Watson, and, J. C. Chow, (1990), Exticntion apportionment for the Denver Brown Cloud, in Visibility and Fine Particles, edited by, C. V. Mathai, pp. 394-409, Air and Waste Manage. Assoc., Pittsburg, Pa.
67. Riedel, T. P., et al. (2012a), Nitryl chloride and molecular chlorine in the coastal marine boundary layer, Environ. Sci. Technol., 46, 10,463-10,470, doi:dx.doi.org/ 10.1021/es204632r.
68. Riedel, T. P., T. H. Bertram, O. S. Ryder, S. Liu, D. A. Day, L. M. Russell, C. J. Gaston, K. A. Prather, and, J. A. Thornton, (2012b), Direct N2O5 reactivity measurements at a polluted coastal site, Atmos. Chem. Phys., 12 (6), 2959-2968, doi: 10.5194/acp-12-2959-2012.
69. Riehl, H., and, D. Herkhof, (1972), Some aspects of Denver air pollution meteorology, J. Appl. Meteorol., 11, 1040-1047.
70. Riemer, N., H. Vogel, B. Vogel, B. Schell, I. Ackerman, C. Kessler, and, H. Hass, (2003), Impact of the heterogeneous hydrolysis of N2O 5 on chemistry and nitrate aerosol formation in the lower troposphere under photosmog conditions, J. Geophys. Res., 108 (D4), 4144, doi: 10.1029/2002JD002436.
71. Roberts, J. M., et al. (2010), Measurement of HONO, HNCO, and other inorganic acids by negative-ion proton-transfer chemical-ionization mass spectrometry (NI-PT-CIMS): Application to biomass burning emissions, Atmos. Meas. Tech., 3, 981-990.
72. Russell, P. A., (1977), Denver Air Pollution Study-1973, U.S. Environ. Prot. Agency, Denver, Colo.
73. Russell, K. M., W. C. Keene, J. R. Maben, J. N. Galloway, and, J. L. Moody, (2003), Phase-partitioning and dry deposisition of atmospheric nitrogen at the mid-Atlantic U.S. Coast, J. Geophys. Res., 108 (D21), 4656, doi: 10.1029/2003JD003736.
74. Russo, R. S., Y. Zhou, K. B. Haase, O. W. Wingenter, E. K. Frinak, H. Mao, R. W. Talbot, and, B. C. Sive, (2010), Temporal variability, sources, and sinks of C1-C5 alklyl nitrates in coastal New England, Atmos. Chem. Phys., 10 (4), 1865-1883.
75. Schaap, M., M. van Loon, H. M. ten Brink, F. J. Dentener, and, P. J. H. Builtjes, (2004), Secondary inorganic aerosol simulations for Europe with special attention to nitrate, Atmos. Chem. Phys., 4 (3), 857-874.
76. Schnell, R. C., S. J. Oltmans, R. R. Neely, M. S. Endres, J. V. Molenar, and, A. B. White, (2009), Rapid photochemical production of ozone at high concentrations in a rural site during winter, Nat. Geosci., 2, 120-122.
77. Silkoff, P. E., L. N. Zhang, S. Dutton, E. L. Langmack, S. Vedal, J. Murphy, and, B. Make, (2005), Winter air pollution and disease parameters in advanced chronic obstructive pulmonary disease panels residing in Denver, Colorado, J. Allergy Clin. Immunol., 115 (2), 337-344.
78. Sive, B. C., Y. Zhou, D. Troop, Y. Wang, W. C. Little, O. W. Wingenter, R. S. Russo, R. h. K. Varner, and, R. Talbot, (2005), Development of a cryogen-free concentration system for measurements of volatile organic compounds, Anal. Chem., 77 (21), 6989-6998, doi: 10.1021/ac0506231.
79. Sloane, C. S., J. G. Watson, J. C. Chow, L. Pritchett, and, L. W. Richards, (1990), Size distribution and optical properties of the Denver Brown Cloud, in Visibility and Fine Particles, edited by, C. V. Mathai, pp. 384-393, Air and Waste Manage. Assoc., Pittsburgh, Pa.
80. Sloane, C. S., J. Watson, J. Chow, L. Pritchett, and, L. W. Richards, (1991), Size-segregated fine particle measurements by chemical-species and their impact on visibility impairment in Denver, Atmos. Environ. Part A, 25 (5-6), 1013-1024.
81. Stanier, C., et al. (2012), Overview of the LADCO winter nitrate study: Hourly ammonia, nitric acid and PM2.5 composition at an urban and rural site pair during PM2.5 episodes in the US Great Lakes region, Atmos. Chem. Phys., 12 (22), 11,037-11,056, doi: 10.5194/acp-12-11037-2012.
82. Stark, H., B. M. Lerner, R. Schmitt, R. Jakoubek, E. J. Williams, T. B. Ryerson, D. T. Sueper, D. D. Parrish, and, F. C. Fehsenfeld, (2007), Atmospheric in situ measurement of nitrate radical (NO3) and other photolysis rates using spectroradiometry and filter radiometry, J. Geophys. Res., 112, D10S04, doi: 10.1029/2006JD007578.
83. Stemmler, K., M. Ammann, C. Donders, J. Kleffmann, and, C. George, (2006), Photosensitized reduction of nitrogen dioxide on humic acid as a source of nitrous acid, Nature, 440, 195-198.
84. Stutz, J., B. Alicke, and, A. Neftel, (2002), Nitrous acid formation in the urban atmosphere: Gradient measurements of NO2 and HONO over grass in Milan, Italy, J. Geophys. Res., 107 (D22), 8192, doi: 10.1029/2001JD000390.
85. Stutz, J., H.-J. Oh, S. I. Whitlow, C. Anderson, J. E. Dibb, J. H. Flynn, B. Rappenglück, and, B. Lefer, (2010), Simultaneous DOAS and mist-chamber IC measurements of HONO in Houston, TX, Atmos. Environ., 44 (33), 4090-4098.
86. Su, H., Y. F. Cheng, M. Shao, D. F. Gao, Z. Y. Yu, L. M. Zeng, J. Slanina, Y. H. Zhang, and, A. Wiedensohler, (2008), Nitrous acid (HONO) and its daytime sources at a rurual site during the 2004 PRIDE-PRD experiment in China, J. Geophys. Res., 113, D14312, doi: 10.1029/2007JD009060.
87. Tanner, D. J., A. Jefferson, and, F. L. Eisele, (1997), Selected ion chemical ionization mass spectrometric measurement of OH, J. Geophys. Res., 102 (D5), 6415-6425.
88. Thornton, J. A., et al. (2010), A large atomic chlorine source inferred from mid-continental reactive nitrogen chemistry, Nature, 464, 271-274.
89. Tolocka, M. P., P. A. Solomon, W. Mitchell, G. A. Norris, D. B. Gemmill, R. W. Wiener, R. W. Vanderpool, J. B. Homolya, and, J. Rice, (2001), East versus West in the US: Chemical characteristics of PM2.5 during the winter of 1999, Aerosol Sci. Technol., 34, 88-96.
90. Toth, J. J., and, R. H. Johnson, (1985), Summer surface flow characteristics over northeast Colorado, Mon. Weather Rev., 113 (9), 1458-1469.
91. Vanvalin, C. C., and, E. Ganor, (1987), Air-pollution measurements at the Boulder-Atmospheric-Observatory, Water Air Soil Pollut., 35 (3-4), 357-372.
92. Veres, P., J. M. Roberts, C. Warneke, D. Welsh-Bon, M. Zahniser, S. Herndon, R. Fall, and, J. de Gouw, (2008), Development of negative-ion proton-transfer chemical-ionization mass spectrometry (NI-PT-CIMS) for the measurement of gas-phase organic acids in the atmosphere, Int. J. Mass Spectrom., 274, 48-55.
93. Waggoner, A. P., (1977), The Brown Cloud of Denver, in Denver Air Pollution Study-1973, edited by, P. G. Russell, pp. 159-167, U.S. Environ. Prot. Agency, Denver, Colo.
94. Wagner, N. L., W. P. Dubé, R. A. Washenfelder, C. J. Young, I. B. Pollack, T. B. Ryerson, and, S. S. Brown, (2011), Diode laser-based cavity ring-down instrument for NO3, N2O5, NO, NO 2 and O3 from aircraft, Atmos. Meas. Tech., 4, 1227-1240.
95. Wagner, N. L., et al. (2012), The sea breeze / land breeze circulation in Los Angeles and its influence on nitryl chloride production and air quality in this region, J. Geophys. Res., 116, D00V24, doi: 10.1029/2012JD017810.
96. Washenfelder, R. A., W. P. Dubé, N. L. Wagner, and, S. S. Brown, (2011), Measurement of atmospheric ozone by cavity ring-down spectroscopy, Environ. Sci. Technol., 45, 2938-2944.
97. Watson, J. G., J. C. Chow, L. C. Pritchett, J. A. Houck, S. Burns, and, R. A. Ragazzi, (1990), Composite source profiles for particulate motor vehicle exhaust source apportionment in Denver, CO., in Visibility and Fine Particles, edited by, C. V. Mathai, pp. 422-436, Air and Waste Manage. Assoc., Pittsburgh, Pa.
98. Watson, J. G., E. M. Fujita, J. C. Chow, B. Zielinska, L. W. Richards, W. Neff, and, D. L. Dietrich, (1998), Northern Front Range Air Quality Study final report, Desert Res. Inst., LOCATION.
99. Williams, E. J., F. C. Fehsenfeld, B. T. Jobson, W. C. Kuster, P. D. Goldan, J. Stutz, and, W. A. McClenny, (2006), Comparison of ultraviolet absorbance, chemiluminescence, and DOAS instruments for ambient ozone monitoring, Environ. Sci. Technol., 40, 5755-5762.
100. Wolff, G. T., R. J. Countess, P. J. Groblicki, M. A. Ferman, S. H. Cadle, and, J. L. Muhlbaier, (1981), Visibility-reducing species in the Denver Brown Cloud. 2. Sources and temporal patterns, Atmos. Environ., 15 (12), 2485-2502.
101. Young, C. J., et al. (2012), Vertically resolved measurements of nighttime radical reservoirs in Los Angeles and their contribution to the urban radical budget, Environ. Sci. Technol., 46, 10,965-10,973, 10.1021/es302206a.
102. Yu, S., R. Dennis, S. Roselle, A. Nenes, J. Walker, B. Eder, K. Schere, J. Swall, and, W. Robarge, (2005), An assessment of the ability of three-dimensional air quality models with current thermodynamic equilibrium models to predict aerosol NO3, J. Geophys. Res., 110, D07S13, doi: 10.1029/2004JD004718.
103. Zhang, N., X. Zhou, P. B. Shepson, H. Gao, M. Alaghmand, and, B. Stirm, (2009), Aircraft measurement of HONO vertical profiles over a forested region, Geophys. Res. Lett., 36, L15820, doi: 10.1029/2009GL038999.
104. Zhou, Y., H. Mao, R. S. Russo, D. R. Blake, O. W. Wingenter, K. B. Haase, J. Ambrose, R. K. Varner, R. Talbot, and, B. C. Sive, (2008), Bromoform and dibromomethane measurements in the seacoast region of New Hampshire, 2002-2004, J. Geophys. Res., 113, D08305, doi: 10.1029/2007JD009103.