Search Results - "Clair, J. M. St"

Conversion of hydroperoxides to carbonyls in field and laboratory instrumentation: Observational bias in diagnosing pristine versus anthropogenically controlled atmospheric chemistry by 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., Keutsch, F. N.

“…Atmospheric volatile organic compound (VOC) oxidation mechanisms under pristine (rural/remote) and urban (anthropogenically‐influenced) conditions follow…”
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Speciation of OH reactivity above the canopy of an isoprene-dominated forest by Kaiser, J, Skog, K. M, Baumann, K, Bertman, S. B, Brown, S. B, Brune, W. H, Crounse, J. D, de Gouw, J. A, Edgerton, E. S, Feiner, P. A, Goldstein, A. H, Koss, A, Misztal, P. K, Nguyen, T. B, Olson, K. F, St. Clair, J. M, Teng, A. P, Toma, S, Wennberg, P. O, Wild, R. J, Zhang, L, Keutsch, F. N

“…Measurements of OH reactivity, the inverse lifetime of the OH radical, can provide a top–down estimate of the total amount of reactive carbon in an air mass…”
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Chemistry of hydrogen oxide radicals (HO x ) in the Arctic troposphere in spring by Mao, J., Jacob, D. J., Evans, M. J., Olson, J. R., Ren, X., Brune, W. H., Clair, J. M. St, Crounse, J. D., Spencer, K. M., Beaver, M. R., Wennberg, P. O., Cubison, M. J., Jimenez, J. L., Fried, A., Weibring, P., Walega, J. G., Hall, S. R., Weinheimer, A. J., Cohen, R. C., Chen, G., Crawford, J. H., McNaughton, C., Clarke, A. D., Jaeglé, L., Fisher, J. A., Yantosca, R. M., Le Sager, P., Carouge, C.

“…We use observations from the April 2008 NASA ARCTAS aircraft campaign to the North American Arctic, interpreted with a global 3-D chemical transport model…”
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Hydroxy nitrate production in the OH-initiated oxidation of alkenes by Teng, A. P, Crounse, J. D, Lee, L, St. Clair, J. M, Cohen, R. C, Wennberg, P. O

“…Alkenes are oxidized rapidly in the atmosphere by addition of OH and subsequently O2 leading to the formation of β-hydroxy peroxy radicals. These peroxy…”
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On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California by Pusede, S. E, Gentner, D. R, Wooldridge, P. J, Browne, E. C, Rollins, A. W, Min, K.-E, Russell, A. R, Thomas, J, Zhang, L, Brune, W. H, Henry, S. B, DiGangi, J. P, Keutsch, F. N, Harrold, S. A, Thornton, J. A, Beaver, M. R, St. Clair, J. M, Wennberg, P. O, Sanders, J, Ren, X, VandenBoer, T. C, Markovic, M. Z, Guha, A, Weber, R, Goldstein, A. H, Cohen, R. C

“…The San Joaquin Valley (SJV) experiences some of the worst ozone air quality in the US, frequently exceeding the California 8 h standard of 70.4 ppb. To…”
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Importance of biogenic precursors to the budget of organic nitrates: observations of multifunctional organic nitrates by CIMS and TD-LIF during BEARPEX 2009 by Beaver, M. R, Clair, J. M. St, Paulot, F, Spencer, K. M, Crounse, J. D, LaFranchi, B. W, Min, K. E, Pusede, S. E, Wooldridge, P. J, Schade, G. W, Park, C, Cohen, R. C, Wennberg, P. O

“…Alkyl and multifunctional organic nitrates, molecules of the chemical form RONO2, are products of chain terminating reactions in the tropospheric HOx and NOx…”
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Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds by 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, Wennberg, P. O

“…The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative atmospheric chamber campaign that occurred during…”
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Quantifying sources and sinks of reactive gases in the lower atmosphere using airborne flux observations by Wolfe, G. M., Hanisco, T. F., Arkinson, H. L., Bui, T. P., Crounse, J. D., Dean-Day, J., Goldstein, A., Guenther, A., Hall, S. R., Huey, G., Jacob, D. J., Karl, T., Kim, P. S., Liu, X., Marvin, M. R., Mikoviny, T., Misztal, P. K., Nguyen, T. B., Peischl, J., Pollack, I., Ryerson, T., St. Clair, J. M., Teng, A., Travis, K. R., Ullmann, K., Wennberg, P. O., Wisthaler, A.

“…Atmospheric composition is governed by the interplay of emissions, chemistry, deposition, and transport. Substantial questions surround each of these…”
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Nitrogen oxides and PAN in plumes from boreal fires during ARCTAS-B and their impact on ozone: an integrated analysis of aircraft and satellite observations by Alvarado, M. J., Logan, J. A., Mao, J., Apel, E., Riemer, D., Blake, D., Cohen, R. C., Min, K.-E., Perring, A. E., Browne, E. C., Wooldridge, P. J., Diskin, G. S., Sachse, G. W., Fuelberg, H., Sessions, W. R., Harrigan, D. L., Huey, G., Liao, J., Case-Hanks, A., Jimenez, J. L., Cubison, M. J., Vay, S. A., Weinheimer, A. J., Knapp, D. J., Montzka, D. D., Flocke, F. M., Pollack, I. B., Wennberg, P. O., Kurten, A., Crounse, J., Clair, J. M. St, Wisthaler, A., Mikoviny, T., Yantosca, R. M., Carouge, C. C., Le Sager, P.

“…We determine enhancement ratios for NOx, PAN, and other NOy species from boreal biomass burning using aircraft data obtained during the ARCTAS-B campaign and…”
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Convective transport and scavenging of peroxides by thunderstorms observed over the central U.S. during DC3 by Barth, M. C., Bela, M. M., Fried, A., Wennberg, P. O., Crounse, J. D., St. Clair, J. M., Blake, N. J., Blake, D. R., Homeyer, C. R., Brune, W. H., Zhang, L., Mao, J., Ren, X., Ryerson, T. B., Pollack, I. B., Peischl, J., Cohen, R. C., Nault, B. A., Huey, L. G., Liu, X., Cantrell, C. A.

“…One of the objectives of the Deep Convective Clouds and Chemistry (DC3) field experiment was to determine the scavenging of soluble trace gases by…”
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Influence of convection on the water isotopic composition of the tropical tropopause layer and tropical stratosphere by Sayres, D. S., Pfister, L., Hanisco, T. F., Moyer, E. J., Smith, J. B., St. Clair, J. M., O'Brien, A. S., Witinski, M. F., Legg, M., Anderson, J. G.

“…We present the first in situ measurements of HDO across the tropical tropopause, obtained by the integrated cavity output spectroscopy (ICOS) and Hoxotope…”
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Quantification of hydroxyacetone and glycolaldehyde using chemical ionization mass spectrometry by St. Clair, J. M, Spencer, K. M, Beaver, M. R, Crounse, J. D, Paulot, F, Wennberg, P. O

“…Chemical ionization mass spectrometry (CIMS) enables online, rapid, in situ detection and quantification of hydroxyacetone and glycolaldehyde. Two different…”
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Emissions of organic carbon and methane from petroleum and dairy operations in California's San Joaquin Valley by Gentner, D. R, Ford, T. B, Guha, A, Boulanger, K, Brioude, J, Angevine, W. M, de Gouw, J. A, Warneke, C, Gilman, J. B, Ryerson, T. B, Peischl, J, Meinardi, S, Blake, D. R, Atlas, E, Lonneman, W. A, Kleindienst, T. E, Beaver, M. R, Clair, J. M. St, Wennberg, P. O, VandenBoer, T. C, Markovic, M. Z, Murphy, J. G, Harley, R. A, Goldstein, A. H

“…Petroleum and dairy operations are prominent sources of gas-phase organic compounds in California's San Joaquin Valley. It is essential to understand the…”
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Exploring Oxidation in the Remote Free Troposphere: Insights From Atmospheric Tomography (ATom) by Brune, W. H., Miller, D. O., Thames, A. B., Allen, H. M., Apel, E. C., Blake, D. R., Bui, T. P., Commane, R., Crounse, J. D., Daube, B. C., Diskin, G. S., DiGangi, J. P., Elkins, J. W., Hall, S. R., Hanisco, T. F., Hannun, R. A., Hintsa, E. J., Hornbrook, R. S., Kim, M. J., McKain, K., Moore, F. L., Neuman, J. A., Nicely, J. M., Peischl, J., Ryerson, T. B., Clair, J. M. St, Sweeney, C., Teng, A. P., Thompson, C., Ullmann, K., Veres, P. R., Wennberg, P. O., Wolfe, G. M.

“…Earth's atmosphere oxidizes the greenhouse gas methane and other gases, thus determining their lifetimes and oxidation products. Much of this oxidation occurs…”
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Sources, seasonality, and trends of southeast US aerosol: an integrated analysis of surface, aircraft, and satellite observations with the GEOS-Chem chemical transport model by Kim, P. S, Jacob, D. J, Fisher, J. A, Travis, K, Yu, K, Zhu, L, Yantosca, R. M, Sulprizio, M. P, Jimenez, J. L, Campuzano-Jost, P, Froyd, K. D, Liao, J, Hair, J. W, Fenn, M. A, Butler, C. F, Wagner, N. L, Gordon, T. D, Welti, A, Wennberg, P. O, Crounse, J. D, St. Clair, J. M, Teng, A. P, Millet, D. B, Schwarz, J. P, Markovic, M. Z, Perring, A. E

“…We use an ensemble of surface (EPA CSN, IMPROVE, SEARCH, AERONET), aircraft (SEAC4RS), and satellite (MODIS, MISR) observations over the southeast US during…”
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Characterization of a real-time tracer for isoprene epoxydiols-derived secondary organic aerosol (IEPOX-SOA) from aerosol mass spectrometer measurements by Hu, W. W, Campuzano-Jost, P, Palm, B. B, Day, D. A, Ortega, A. M, Hayes, P. L, Krechmer, J. E, Chen, Q, Kuwata, M, Liu, Y. J, de Sá, S. S, McKinney, K, Martin, S. T, Hu, M, Budisulistiorini, S. H, Riva, M, Surratt, J. D, St. Clair, J. M, Isaacman-Van Wertz, G, Yee, L. D, Goldstein, A. H, Carbone, S, Brito, J, Artaxo, P, de Gouw, J. A, Koss, A, Wisthaler, A, Mikoviny, T, Karl, T, Kaser, L, Jud, W, Hansel, A, Docherty, K. S, Alexander, M. L, Robinson, N. H, Coe, H, Allan, J. D, Canagaratna, M. R, Paulot, F, Jimenez, J. L

“…Substantial amounts of secondary organic aerosol (SOA) can be formed from isoprene epoxydiols (IEPOX), which are oxidation products of isoprene mainly under…”
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Formation of large (≃100 μm) ice crystals near the tropical tropopause by Jensen, E. J., Pfister, L., Bui, T. V., Lawson, P., Baker, B., Mo, Q., Baumgardner, D., Weinstock, E. M., Smith, J. B., Moyer, E. J., Hanisco, T. F., Sayres, D. S., Clair, J. M. St, Alexander, M. J., Toon, O. B., Smith, J. A.

“…Recent high-altitude aircraft measurements with in situ imaging instruments indicated the presence of relatively large (≃100 μm length), thin (aspect ratios of…”
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Observations of deep convective influence on stratospheric water vapor and its isotopic composition by Hanisco, Thomas F., Moyer, E. J., Weinstock, E. M., St. Clair, J. M., Sayres, D. S., Smith, J. B., Lockwood, R., Anderson, J. G., Dessler, A. E., Keutsch, F. N., Spackman, J. R., Read, W. G., Bui, T. P.

“…In situ observations of H2O and HDO in the midlatitude stratosphere are used to evaluate the role of convection in determining the stratospheric water budget…”
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Impact of the deep convection of isoprene and other reactive trace species on radicals and ozone in the upper troposphere by Apel, E. C, Olson, J. R, Crawford, J. H, Hornbrook, R. S, Hills, A. J, Cantrell, C. A, Emmons, L. K, Knapp, D. J, Hall, S, Mauldin III, R. L, Weinheimer, A. J, Fried, A, Blake, D. R, Crounse, J. D, Clair, J. M. St, Wennberg, P. O, Diskin, G. S, Fuelberg, H. E, Wisthaler, A, Mikoviny, T, Brune, W, Riemer, D. D

“…Observations of a comprehensive suite of inorganic and organic trace gases, including non-methane hydrocarbons (NMHCs), halogenated organics and oxygenated…”
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Validation of the Harvard Lyman-? in situ water vapor instrument: Implications for the mechanisms that control stratospheric water vapor by Weinstock, E M, Smith, J B, Sayres, D S, Pittman, J V, Spackman, J R, Hintsa, E J, Hanisco, T F, Moyer, E J, St. Clair, J M, Sargent, M R, Anderson, J G

“…Building on previously published details of the laboratory calibrations of the Harvard Lyman- photofragment fluorescence hygrometer (HWV) on the NASA ER-2 and…”
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