Zobrazeno 1 - 10
of 493
pro vyhledávání: '"J M, Roberts"'
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
Publikováno v:
Atmospheric Measurement Techniques, Vol 15, Pp 4295-4305 (2022)
Iodide chemical ionization mass spectrometry (CIMS) is a common analytical tool used in both laboratory and field experiments to measure a large suite of atmospherically relevant compounds. Here, we describe a systematic ion molecule reactor (IMR) te
Externí odkaz:
https://doaj.org/article/592b8fcec5364c6388290d9cd32818ba
Autor:
B. A. Nault, D. S. Jo, B. C. McDonald, P. Campuzano-Jost, D. A. Day, W. Hu, J. C. Schroder, J. Allan, D. R. Blake, M. R. Canagaratna, H. Coe, M. M. Coggon, P. F. DeCarlo, G. S. Diskin, R. Dunmore, F. Flocke, A. Fried, J. B. Gilman, G. Gkatzelis, J. F. Hamilton, T. F. Hanisco, P. L. Hayes, D. K. Henze, A. Hodzic, J. Hopkins, M. Hu, L. G. Huey, B. T. Jobson, W. C. Kuster, A. Lewis, M. Li, J. Liao, M. O. Nawaz, I. B. Pollack, J. Peischl, B. Rappenglück, C. E. Reeves, D. Richter, J. M. Roberts, T. B. Ryerson, M. Shao, J. M. Sommers, J. Walega, C. Warneke, P. Weibring, G. M. Wolfe, D. E. Young, B. Yuan, Q. Zhang, J. A. de Gouw, J. L. Jimenez
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 11201-11224 (2021)
Anthropogenic secondary organic aerosol (ASOA), formed from anthropogenic emissions of organic compounds, constitutes a substantial fraction of the mass of submicron aerosol in populated areas around the world and contributes to poor air quality and
Externí odkaz:
https://doaj.org/article/953f35d7db4b44a199ec9afe12ceeb91
Autor:
J. M. Roberts
Publikováno v:
Atmospheric Chemistry and Physics, Vol 21, Pp 16793-16795 (2021)
Chai et al. (2021) recently published measurements of wildfire-derived (WF) oxides of nitrogen (NOx) and nitrous acid (HONO) and their isotopic composition. The method used to sample NOx, collection in alkaline solution, has a known 1:1 interference
Externí odkaz:
https://doaj.org/article/8177f1e182924fa69b4455217e045c01
Autor:
J. M. Roberts, C. E. Stockwell, R. J. Yokelson, J. de Gouw, Y. Liu, V. Selimovic, A. R. Koss, K. Sekimoto, M. M. Coggon, B. Yuan, K. J. Zarzana, S. S. Brown, C. Santin, S. H. Doerr, C. Warneke
Publikováno v:
Atmospheric Chemistry and Physics, Vol 20, Pp 8807-8826 (2020)
Reactive nitrogen (Nr, defined as all nitrogen-containing compounds except for N2 and N2O) is one of the most important classes of compounds emitted from wildfire, as Nr impacts both atmospheric oxidation processes and particle formation chemistry. I
Externí odkaz:
https://doaj.org/article/4b5115ce048640d196a7b170e1c7a804
Autor:
L. T. Fleming, P. Lin, J. M. Roberts, V. Selimovic, R. Yokelson, J. Laskin, A. Laskin, S. A. Nizkorodov
Publikováno v:
Atmospheric Chemistry and Physics, Vol 20, Pp 1105-1129 (2020)
To better understand the effects of wildfires on air quality and climate, it is important to assess the occurrence of chromophoric compounds in smoke and characterize their optical properties. This study explores the molecular composition of light-ab
Externí odkaz:
https://doaj.org/article/d33b69852bc449c3be458db2a2bcec71
Autor:
M. M. Coggon, C. Y. Lim, A. R. Koss, K. Sekimoto, B. Yuan, J. B. Gilman, D. H. Hagan, V. Selimovic, K. J. Zarzana, S. S. Brown, J. M. Roberts, M. Müller, R. Yokelson, A. Wisthaler, J. E. Krechmer, J. L. Jimenez, C. Cappa, J. H. Kroll, J. de Gouw, C. Warneke
Publikováno v:
Atmospheric Chemistry and Physics, Vol 19, Pp 14875-14899 (2019)
Chamber oxidation experiments conducted at the Fire Sciences Laboratory in 2016 are evaluated to identify important chemical processes contributing to the hydroxy radical (OH) chemistry of biomass burning non-methane organic gases (NMOGs). Based on t
Externí odkaz:
https://doaj.org/article/d57bf71ece1a46129c61c063239b401d
Autor:
X. Chen, D. B. Millet, H. B. Singh, A. Wisthaler, E. C. Apel, E. L. Atlas, D. R. Blake, I. Bourgeois, S. S. Brown, J. D. Crounse, J. A. de Gouw, F. M. Flocke, A. Fried, B. G. Heikes, R. S. Hornbrook, T. Mikoviny, K.-E. Min, M. Müller, J. A. Neuman, D. W. O'Sullivan, J. Peischl, G. G. Pfister, D. Richter, J. M. Roberts, T. B. Ryerson, S. R. Shertz, C. R. Thompson, V. Treadaway, P. R. Veres, J. Walega, C. Warneke, R. A. Washenfelder, P. Weibring, B. Yuan
Publikováno v:
Atmospheric Chemistry and Physics, Vol 19, Pp 9097-9123 (2019)
We apply a high-resolution chemical transport model (GEOS-Chem CTM) with updated treatment of volatile organic compounds (VOCs) and a comprehensive suite of airborne datasets over North America to (i) characterize the VOC budget and (ii) test the abi
Externí odkaz:
https://doaj.org/article/92ebc82aebd14abc997b4b33ab4695fc
Effects of gas–wall interactions on measurements of semivolatile compounds and small polar molecules
Autor:
X. Liu, B. Deming, D. Pagonis, D. A. Day, B. B. Palm, R. Talukdar, J. M. Roberts, P. R. Veres, J. E. Krechmer, J. A. Thornton, J. A. de Gouw, P. J. Ziemann, J. L. Jimenez
Publikováno v:
Atmospheric Measurement Techniques, Vol 12, Pp 3137-3149 (2019)
Recent work has quantified the delay times in measurements of volatile organic compounds (VOCs) caused by the partitioning between the gas phase and the surfaces of the inlet tubing and instrument itself. In this study we quantify wall partitioning e
Externí odkaz:
https://doaj.org/article/cbc4c1051bbe4695a4101d7bf2d26a90
Autor:
J. M. Roberts, Y. Liu
Publikováno v:
Atmospheric Chemistry and Physics, Vol 19, Pp 4419-4437 (2019)
Condensed-phase uptake and reaction are important atmospheric removal processes for reduced nitrogen species, isocyanic acid (HNCO), methyl isocyanate (CH3NCO), and cyanogen halides (XCN, X = Cl, Br, I); yet many of the fundamental quantities tha
Externí odkaz:
https://doaj.org/article/94df30f7a1854095a8d013a7d9f14f81