Zobrazeno 1 - 10
of 33
pro vyhledávání: '"W. P. Dubé"'
Autor:
K. J. Zarzana, V. Selimovic, A. R. Koss, K. Sekimoto, M. M. Coggon, B. Yuan, W. P. Dubé, R. J. Yokelson, C. Warneke, J. A. de Gouw, J. M. Roberts, S. S. Brown
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 15451-15470 (2018)
We report the emissions of glyoxal and methylglyoxal from the open burning of biomass during the NOAA-led 2016 FIREX intensive at the Fire Sciences Laboratory in Missoula, MT. Both compounds were measured using cavity-enhanced spectroscopy, which i
Externí odkaz:
https://doaj.org/article/f562246082ff4322a88b61ce3a2e1983
Autor:
J. L. Fry, S. S. Brown, A. M. Middlebrook, P. M. Edwards, P. Campuzano-Jost, D. A. Day, J. L. Jimenez, H. M. Allen, T. B. Ryerson, I. Pollack, M. Graus, C. Warneke, J. A. de Gouw, C. A. Brock, J. Gilman, B. M. Lerner, W. P. Dubé, J. Liao, A. Welti
Publikováno v:
Atmospheric Chemistry and Physics, Vol 18, Pp 11663-11682 (2018)
Nighttime reaction of nitrate radicals (NO3) with biogenic volatile organic compounds (BVOC) has been proposed as a potentially important but also highly uncertain source of secondary organic aerosol (SOA). The southeastern United States has both
Externí odkaz:
https://doaj.org/article/8b00b5f391784807be382acac7947c3b
Autor:
K.-E. Min, R. A. Washenfelder, W. P. Dubé, A. O. Langford, P. M. Edwards, K. J. Zarzana, J. Stutz, K. Lu, F. Rohrer, Y. Zhang, S. S. Brown
Publikováno v:
Atmospheric Measurement Techniques, Vol 9, Iss 2, Pp 423-440 (2016)
We describe a two-channel broadband cavity enhanced absorption spectrometer (BBCEAS) for aircraft measurements of glyoxal (CHOCHO), methylglyoxal (CH3COCHO), nitrous acid (HONO), nitrogen dioxide (NO2), and water (H2O). The instrument spans 361–389
Externí odkaz:
https://doaj.org/article/9bba20289f924b0983f09d351f138be5
Autor:
R. J. Wild, P. M. Edwards, T. S. Bates, R. C. Cohen, J. A. de Gouw, W. P. Dubé, J. B. Gilman, J. Holloway, J. Kercher, A. R. Koss, L. Lee, B. M. Lerner, R. McLaren, P. K. Quinn, J. M. Roberts, J. Stutz, J. A. Thornton, P. R. Veres, C. Warneke, E. Williams, C. J. Young, B. Yuan, K. J. Zarzana, S. S. Brown
Publikováno v:
Atmospheric Chemistry and Physics, Vol 16, Pp 573-583 (2016)
High wintertime ozone levels have been observed in the Uintah Basin, Utah, a sparsely populated rural region with intensive oil and gas operations. The reactive nitrogen budget plays an important role in tropospheric ozone formation. Measurements
Externí odkaz:
https://doaj.org/article/62d5c3ed436c49df9f12794faf92cb8f
Autor:
B. Yuan, P. R. Veres, C. Warneke, J. M. Roberts, J. B. Gilman, A. Koss, P. M. Edwards, M. Graus, W. C. Kuster, S.-M. Li, R. J. Wild, S. S. Brown, W. P. Dubé, B. M. Lerner, E. J. Williams, J. E. Johnson, P. K. Quinn, T. S. Bates, B. Lefer, P. L. Hayes, J. L. Jimenez, R. J. Weber, R. Zamora, B. Ervens, D. B. Millet, B. Rappenglück, J. A. de Gouw
Publikováno v:
Atmospheric Chemistry and Physics, Vol 15, Iss 4, Pp 1975-1993 (2015)
Formic acid (HCOOH) is one of the most abundant carboxylic acids in the atmosphere. However, current photochemical models cannot fully explain observed concentrations and in particular secondary formation of formic acid across various environments. I
Externí odkaz:
https://doaj.org/article/ace1f35f1de043ce9e81cc7118a36470
Autor:
S. S. Brown, W. P. Dubé, R. Bahreini, A. M. Middlebrook, C. A. Brock, C. Warneke, J. A. de Gouw, R. A. Washenfelder, E. Atlas, J. Peischl, T. B. Ryerson, J. S. Holloway, J. P. Schwarz, R. Spackman, M. Trainer, D. D. Parrish, F. C. Fehshenfeld, A. R. Ravishankara
Publikováno v:
Atmospheric Chemistry and Physics, Vol 13, Iss 22, Pp 11317-11337 (2013)
Organic compounds are a large component of aerosol mass, but organic aerosol (OA) sources remain poorly characterized. Recent model studies have suggested nighttime oxidation of biogenic hydrocarbons as a potentially large OA source, but analysis of
Externí odkaz:
https://doaj.org/article/e8bf44f6fc6144eaa60624dc916a6f9e
Autor:
P. M. Edwards, C. J. Young, K. Aikin, J. deGouw, W. P. Dubé, F. Geiger, J. Gilman, D. Helmig, J. S. Holloway, J. Kercher, B. Lerner, R. Martin, R. McLaren, D. D. Parrish, J. Peischl, J. M. Roberts, T. B. Ryerson, J. Thornton, C. Warneke, E. J. Williams, S. S. Brown
Publikováno v:
Atmospheric Chemistry and Physics, Vol 13, Iss 17, Pp 8955-8971 (2013)
The Uintah Basin in northeastern Utah, a region of intense oil and gas extraction, experienced ozone (O3) concentrations above levels harmful to human health for multiple days during the winters of 2009–2010 and 2010–2011. These wintertime O3 pol
Externí odkaz:
https://doaj.org/article/c0d6d3230f4d48e3af191f2847e398ec
Autor:
H.-P. Dorn, R. L. Apodaca, S. M. Ball, T. Brauers, S. S. Brown, J. N. Crowley, W. P. Dubé, H. Fuchs, R. Häseler, U. Heitmann, R. L. Jones, A. Kiendler-Scharr, I. Labazan, J. M. Langridge, J. Meinen, T. F. Mentel, U. Platt, D. Pöhler, F. Rohrer, A. A. Ruth, E. Schlosser, G. Schuster, A. J. L. Shillings, W. R. Simpson, J. Thieser, R. Tillmann, R. Varma, D. S. Venables, A. Wahner
Publikováno v:
Atmospheric Measurement Techniques, Vol 6, Iss 5, Pp 1111-1140 (2013)
The detection of atmospheric NO3 radicals is still challenging owing to its low mixing ratios (≈ 1 to 300 pptv) in the troposphere. While long-path differential optical absorption spectroscopy (DOAS) has been a well-established NO3 detection approa
Externí odkaz:
https://doaj.org/article/1bf99a9cea834b5c93bdaed465843fa1
Autor:
A. W. Rollins, G. Schuster, Y. Nakashima, F. Rohrer, T. F. Mentel, J. Matsumoto, I. Labazan, Y. Kajii, A. Kiendler-Scharr, R. Häseler, J. L. Fry, W. P. Dubé, J. N. Crowley, H.-P. Dorn, R. C. Cohen, T. Brauers, R. L. Apodaca, W. R. Simpson, H. Fuchs, R. Tillmann, A. Wahner, P. J. Wooldridge, S. S. Brown
Publikováno v:
Atmospheric Measurement Techniques, Vol 5, Iss 11, Pp 2763-2777 (2012)
N2O5 detection in the atmosphere has been accomplished using techniques which have been developed during the last decade. Most techniques use a heated inlet to thermally decompose N2O5 to NO3, which can be detected by either cavity based absorption a
Externí odkaz:
https://doaj.org/article/c3781ab1681947258c91e81018d0f9e8
Autor:
T. B. Ryerson, I. B. Pollack, C. J. Young, R. A. Washenfelder, W. P. Dubé, N. L. Wagner, S. S. Brown
Publikováno v:
Atmospheric Measurement Techniques, Vol 4, Iss 6, Pp 1227-1240 (2011)
This article presents a diode laser-based, cavity ring-down spectrometer for simultaneous in situ measurements of four nitrogen oxide species, NO3, N2O5, NO, NO2, as well as O3, designed for deployment on aircraft. The instrument measures NO3 and NO2
Externí odkaz:
https://doaj.org/article/9cdb2754644f41b994e991c27c6c4de3