Zobrazeno 1 - 10
of 962
pro vyhledávání: '"H A Allen"'
Autor:
J. M. Roberts, S. Wang, P. R. Veres, J. A. Neuman, M. A. Robinson, I. Bourgeois, J. Peischl, T. B. Ryerson, C. R. Thompson, H. M. Allen, J. D. Crounse, P. O. Wennberg, S. R. Hall, K. Ullmann, S. Meinardi, I. J. Simpson, D. Blake
Publikováno v:
Atmospheric Chemistry and Physics, Vol 24, Pp 3421-3443 (2024)
Bromine activation (the production of Br in an elevated oxidation state) promotes ozone destruction and mercury removal in the global troposphere and commonly occurs in both springtime polar boundary layers, often accompanied by nearly complete ozone
Externí odkaz:
https://doaj.org/article/1a37751b59af4b93b1fa5bcd304102b7
Autor:
B. Bottorff, M. M. Lew, Y. Woo, P. Rickly, M. D. Rollings, B. Deming, D. C. Anderson, E. Wood, H. D. Alwe, D. B. Millet, A. Weinheimer, G. Tyndall, J. Ortega, S. Dusanter, T. Leonardis, J. Flynn, M. Erickson, S. Alvarez, J. C. Rivera-Rios, J. D. Shutter, F. Keutsch, D. Helmig, W. Wang, H. M. Allen, J. H. Slade, P. B. Shepson, S. Bertman, P. S. Stevens
Publikováno v:
Atmospheric Chemistry and Physics, Vol 23, Pp 10287-10311 (2023)
The hydroxyl (OH), hydroperoxy (HO2), and organic peroxy (RO2) radicals play important roles in atmospheric chemistry. In the presence of nitrogen oxides (NOx), reactions between OH and volatile organic compounds (VOCs) can initiate a radical propaga
Externí odkaz:
https://doaj.org/article/f35d0abf1c7945e2af04205e550ee50d
Autor:
I. Bourgeois, J. Peischl, J. A. Neuman, S. S. Brown, H. M. Allen, P. Campuzano-Jost, M. M. Coggon, J. P. DiGangi, G. S. Diskin, J. B. Gilman, G. I. Gkatzelis, H. Guo, H. A. Halliday, T. F. Hanisco, C. D. Holmes, L. G. Huey, J. L. Jimenez, A. D. Lamplugh, Y. R. Lee, J. Lindaas, R. H. Moore, B. A. Nault, J. B. Nowak, D. Pagonis, P. S. Rickly, M. A. Robinson, A. W. Rollins, V. Selimovic, J. M. St. Clair, D. Tanner, K. T. Vasquez, P. R. Veres, C. Warneke, P. O. Wennberg, R. A. Washenfelder, E. B. Wiggins, C. C. Womack, L. Xu, K. J. Zarzana, T. B. Ryerson
Publikováno v:
Atmospheric Measurement Techniques, Vol 15, Pp 4901-4930 (2022)
We present a comparison of fast-response instruments installed onboard the NASA DC-8 aircraft that measured nitrogen oxides (NO and NO2), nitrous acid (HONO), total reactive odd nitrogen (measured both as the total (NOy) and from the sum of individua
Externí odkaz:
https://doaj.org/article/9188f1ee9ceb43db8827fc00b37f5682
Autor:
D. Wei, H. D. Alwe, D. B. Millet, B. Bottorff, M. Lew, P. S. Stevens, J. D. Shutter, J. L. Cox, F. N. Keutsch, Q. Shi, S. C. Kavassalis, J. G. Murphy, K. T. Vasquez, H. M. Allen, E. Praske, J. D. Crounse, P. O. Wennberg, P. B. Shepson, A. A. T. Bui, H. W. Wallace, R. J. Griffin, N. W. May, M. Connor, J. H. Slade, K. A. Pratt, E. C. Wood, M. Rollings, B. L. Deming, D. C. Anderson, A. L. Steiner
Publikováno v:
Geoscientific Model Development, Vol 14, Pp 6309-6329 (2021)
The FORCAsT (FORest Canopy Atmosphere Transfer) model version 1.0 is updated to FORCAsT 2.0 by implementing five major changes, including (1) a change to the operator splitting, separating chemistry from emission and dry deposition, which reduces the
Externí odkaz:
https://doaj.org/article/7ef1e45541fe4cd98818e53c0ab3fff4
Autor:
Y. Gonzalez, R. Commane, E. Manninen, B. C. Daube, L. D. Schiferl, J. B. McManus, K. McKain, E. J. Hintsa, J. W. Elkins, S. A. Montzka, C. Sweeney, F. Moore, J. L. Jimenez, P. Campuzano Jost, T. B. Ryerson, I. Bourgeois, J. Peischl, C. R. Thompson, E. Ray, P. O. Wennberg, J. Crounse, M. Kim, H. M. Allen, P. A. Newman, B. B. Stephens, E. C. Apel, R. S. Hornbrook, B. A. Nault, E. Morgan, S. C. Wofsy
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 11113-11132 (2021)
We measured the global distribution of tropospheric N2O mixing ratios during the NASA airborne Atmospheric Tomography (ATom) mission. ATom measured concentrations of ∼ 300 gas species and aerosol properties in 647 vertical profiles spanning the Pac
Externí odkaz:
https://doaj.org/article/31481aace19749b9945229df648b2b2a
Autor:
K. R. Travis, C. L. Heald, H. M. Allen, E. C. Apel, S. R. Arnold, D. R. Blake, W. H. Brune, X. Chen, R. Commane, J. D. Crounse, B. C. Daube, G. S. Diskin, J. W. Elkins, M. J. Evans, S. R. Hall, E. J. Hintsa, R. S. Hornbrook, P. S. Kasibhatla, M. J. Kim, G. Luo, K. McKain, D. B. Millet, F. L. Moore, J. Peischl, T. B. Ryerson, T. Sherwen, A. B. Thames, K. Ullmann, X. Wang, P. O. Wennberg, G. M. Wolfe, F. Yu
Publikováno v:
Atmospheric Chemistry and Physics, Vol 20, Pp 7753-7781 (2020)
The global oxidation capacity, defined as the tropospheric mean concentration of the hydroxyl radical (OH), controls the lifetime of reactive trace gases in the atmosphere such as methane and carbon monoxide (CO). Models tend to underestimate the met
Externí odkaz:
https://doaj.org/article/d481fda9e1204e94ad9316691357c891
Autor:
A. B. Thames, W. H. Brune, D. O. Miller, H. M. Allen, E. C. Apel, D. R. Blake, T. P. Bui, R. Commane, J. D. Crounse, B. C. Daube, G. S. Diskin, J. P. DiGangi, J. W. Elkins, S. R. Hall, T. F. Hanisco, R. A. Hannun, E. Hintsa, R. S. Hornbrook, M. J. Kim, K. McKain, F. L. Moore, J. M. Nicely, J. Peischl, T. B. Ryerson, J. M. St. Clair, C. Sweeney, A. Teng, C. R. Thompson, K. Ullmann, P. O. Wennberg, G. M. Wolfe
Publikováno v:
Atmospheric Chemistry and Physics, Vol 20, Pp 4013-4029 (2020)
The hydroxyl radical (OH) reacts with thousands of chemical species in the atmosphere, initiating their removal and the chemical reaction sequences that produce ozone, secondary aerosols, and gas-phase acids. OH reactivity, which is the inverse of OH
Externí odkaz:
https://doaj.org/article/c7b39ea8c6ad442ab137ec45a9f1a1a3
Publikováno v:
Journal of Cheminformatics, Vol 11, Iss 1, Pp 1-19 (2019)
Abstract Despite the increasing knowledge in both the chemical and biological domains the assimilation and exploration of heterogeneous datasets, encoding information about the chemical, bioactivity and phenotypic properties of compounds, remains a c
Externí odkaz:
https://doaj.org/article/eaf77eda61084b76aea91944cf212b99
Publikováno v:
Atmospheric Measurement Techniques, Vol 11, Pp 6815-6832 (2018)
Oxygenated volatile organic compounds (OVOCs) are formed during the oxidation of gas-phase hydrocarbons in the atmosphere. However, analytical challenges have hampered ambient measurements for many of these species, leaving unanswered questions regar
Externí odkaz:
https://doaj.org/article/d7a63f6f5a5a45b098a47d0c5a7b06b3
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