Now showing items 1-20 of 144

    • On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California 

      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. (Copernicus Publications, 2004-04-04)
      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 improve our understanding of trends in the number of ozone violations ...
    • Spaceborne observations of sun glint and near-cloud aerosols 

      Várnai, Tamás; Marshak, Alexander; Wen, Guoyong; Yang, Weidong; Eck, Thomas; Levy, Robert; Kostinski, Alexander (2006-06-02)
    • Observations of deep convective influence on stratospheric water vapor and its isotopic composition 

      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. (AGU Pubication, 2007-02-27)
      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. The observations show that water vapor in the overworld ...
    • Formation of large (≃100 μm) ice crystals near the tropical tropopause 

      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.; St. Clair, J. M.; Alexander, M. J.; Toon, O. B.; Smith, J. A. (Copernicus Publications, 2008-03-18)
      Recent high-altitude aircraft measurements with in situ imaging instruments indicated the presence of relatively large (≃100 μm length), thin (aspect ratios of ≃6:1 or larger) hexagonal plate ice crystals near the tropical ...
    • Chemistry of hydrogen oxide radicals (HOₓ) in the Arctic troposphere in spring 

      Mao, J.; Jacob, D. J.; Evans, M. J.; Olson, J. R.; Ren, X.; Brune, W. H.; St. Clair, J. M.; 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.; Sager, P. Le; Carouge, C. (Copernicus Publications, 2010-07-01)
      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 (GEOS-Chem), to better understand the sources and cycling of hydrogen ...
    • Infrared retrievals of dust using AIRS: Comparisons of optical depths and heights derived for a North African dust storm to other collocated EOS A‐Train and surface observations 

      DeSouza‐Machado, S.G.; Strow, L.L.; Imbiriba, B.; McCann, K.; Hoff, R.M.; Hannon, S.E.; Martins, J.V.; Tanré, D.; Deuzé, J.L.; Ducos, F.; Torres, O. (American Geophysical Union, 2010-08-03)
      [1] AIRS thermal infrared radiance data are used with a fast infrared scattering radiative transfer model to physically retrieve the dust column amount and dust height over both ocean and land. The retrieved optical depths ...
    • Influence of convection on the water isotopic composition of the tropical tropopause layer and tropical stratosphere 

      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. (AGU Pubication, 2010-09-25)
      We present the first in situ measurements of HDO across the tropical tropopause, obtained by the integrated cavity output spectroscopy (ICOS) and Hoxotope water isotope instruments during the Costa Rica Aura Validation ...
    • Improved agreement of AIRS tropospheric carbon monoxide products with other EOS sensors using optimal estimation retrievals 

      Warner, J. X.; Wei, Z.; Strow, L. L.; Barnet, C.D.; Sparling, L. C.; Diskin, G.; Sachse, G. (Copernicus Publications on behalf of the European Geosciences Union, 2010-10-08)
      We present in this paper an alternative retrieval algorithm for the Atmospheric Infrared Sounder (AIRS) tropospheric Carbon Monoxide (CO) products using the Optimal Estimation (OE) technique, which is different from the ...
    • Global and regional effects of the photochemistry of CH₃O₂NO₂: evidence from ARCTAS 

      Browne, E. C.; Perring, A. E.; Wooldridge, P. J.; Apel, E.; Hall, S. R.; Huey, L. G.; Mao, J.; Spencer, K.M.; St. Clair, J.M.; Weinheimer, A. J.; Wisthaler, A.; Cohen, R. C. (Copernicus Publications, 2011-05-06)
      Using measurements from the NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) experiment, we show that methyl peroxy nitrate (CH₃O₂NO₂) is present in concentrations of ~5–15 ...
    • Satellite- and ground-based CO total column observations over 2010 Russian fires: accuracy of top-down estimates based on thermal IR satellite data 

      Yurganov, L. N.; Rakitin, V.; Dzhola, A.; August, T.; Fokeeva, E.; George, M.; Gorchakov, G.; Grechko, E.; Hannon, S.; Karpov, A.; Ott, L.; Semutnikova, E.; Shumsky, R.; Strow, L. (Copernicus Publications on behalf of the European Geosciences Union, 2011-08-04)
      CO total column data are presented from three space sounders and two ground-based spectrometers in Moscow and its suburbs during the forest and peat fires that occurred in Central Russia in July–August 2010. Also presented ...
    • Comparison of chemical characteristics of 495 biomass burning plumes intercepted by the NASA DC-8 aircraft during the ARCTAS/CARB-2008 field campaign 

      Hecobian, A.; Liu, Z.; Hennigan, C. J.; Huey, L. G.; Jimenez, J. L.; Cubison, M. J.; Vay, S.; Diskin, G. S.; Sachse, G. W.; Wisthaler, A.; Mikoviny, T.; Weinheimer, A. J.; Liao, J.; Knapp, D. J.; Wennberg, P. O.; Kürten, A.; Crounse, J. D.; St. Clair, J.; Wang1, Y.; Weber, R. J. (Copernicus Publications, 2011-12-22)
      his paper compares measurements of gaseous and particulate emissions from a wide range of biomass-burning plumes intercepted by the NASA DC-8 research aircraft during the three phases of the ARCTAS-2008 experiment: ARCTAS-A, ...
    • Impact of the deep convection of isoprene and other reactive trace species on radicals and ozone in the upper troposphere 

      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, R. L.; Weinheimer, A. J.; Fried, A.; Blake, D. R.; Crounse, J. D.; St. Clair, J. M.; Wennberg, P. O.; Diskin, G. S.; Fuelberg, H. E.; Wisthaler, A.; Mikoviny, T.; Brune, W.; Riemer, D. D. (Copernicus Publications, 2012-01-27)
      Observations of a comprehensive suite of inorganic and organic trace gases, including non-methane hydrocarbons (NMHCs), halogenated organics and oxygenated volatile organic compounds (OVOCs), obtained from the NASA DC-8 ...
    • Hyperspectral Earth Observation from IASI: Five Years of Accomplishments 

      Hilton, Fiona; Armante, Raymond; August, Thomas; Barnet, Chris; Bouchard, Aurelie; Camy-Peyret, Claude; Capelle, Virginie; Clarisse, Lieven; Clerbaux, Cathy; Coheur, Pierre-Francois; Collard, Andrew; Crevoisier, Cyril; Dufour, Gaelle; Edwards, David; Faijan, Francois; Fourrié, Nadia; Gambacorta, Antonia; Goldberg, Mitchell; Guidard, Vincent; Hurtmans, Daniel; Illingworth, Samuel; Jacquinet-Husson, Nicole; Kerzenmacher, Tobias; Klaes, Dieter; Lavanant, Lydie; Masiello, Guido; McNally, Anthony; Matricardi, Marco; Pavelin, Edward; Newman, Stuart; Payan, Sebastien; Péquignot, Eric; Peyridieu, Sophie; Phulpin, Thierry; Remedios, John; Schlüssel, Peter; Serio, Carmine; Strow, Larrabee; Stubenrauch, Claudia; Taylor, Jonathan; Tobin, David; Wolf, Walter; Zhou, Daniel (American Meteorological Society, 2012-03-01)
      The Infrared Atmospheric Sounding Interferometer (IASI) forms the main infrared sounding component of the European Organisation for the Exploitation of Meteorological Satellites's (EUMETSAT's) Meteorological Operation ...
    • Importance of biogenic precursors to the budget of organic nitrates: observations of multifunctional organic nitrates by CIMS and TD-LIF during BEARPEX 2009 

      Beaver, M.R.; St. Clair, J. M.; 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. (Copernicus Publications, 2012-07-03)
      Alkyl and multifunctional organic nitrates, molecules of the chemical form RONO₂, are products of chain terminating reactions in the tropospheric HOₓ and NOₓ catalytic cycles and thereby impact ozone formation locally. ...
    • An analysis of fast photochemistry over high northern latitudes during spring and summer using in-situ observations from ARCTAS and TOPSE 

      Olson, J. R.; Crawford, J. H.; Brune, W.; Mao, J.; Ren, X.; Fried, A.; Anderson, B.; Apel, E.; Beaver, M.; Blake, D.; Chen, G.; Crounse, J.; Dibb, J.; Diskin, G.; Hall, S. R.; Huey, L. G.; Knapp, D.; Richter, D.; Riemer, D.; St. Clair, J.; Ullmann, K.; Walega, J.; Weibring, P.; Weinheimer, A.; Wennberg, P.; Wisthaler, A. (Copernicus Publications, 2012-08-01)
      Observations of chemical constituents and meteorological quantities obtained during the two Arctic phases of the airborne campaign ARCTAS (Arctic Research of the Composition of the Troposphere from Aircraft and Satellites) ...
    • Improving the Computational Effciency of Downscaling GCM data for Use in SWAT 

      Evans, Christopher; Gartrell, Abigail; Gomez, Lauren; Mouyebe, Moise; Oxley, Darius; Popuri, Sai Kumar; Neerchal, Nagaraj K.; Mehta, Amita (2014)
      This project creates software tools to streamline the computational procedures to generate high-resolution weather parameters from low resolution Global Climate Models (GCM) to be input into the Soil and Water Assessment ...
    • Quantification of hydroxyacetone and glycolaldehyde using chemical ionization mass spectrometry 

      St. Clair, J. M.; Spencer, K. M.; Beaver, M.R.; Crounse, J.D.; Paulot, F.; Wennberg, P. O. (Copernicus Publications, 2014-04-30)
      Chemical ionization mass spectrometry (CIMS) enables online, rapid, in situ detection and quantification of hydroxyacetone and glycolaldehyde. Two different CIMS approaches are demonstrated employing the strengths of single ...
    • Emissions of organic carbon and methane from petroleum and dairy operations in California's San Joaquin Valley 

      Gentner, D. R.; Ford, T. B.; Guha, A.; Boulanger, K.; Brioude, J.; Angevine, W. M.; Gouw, J. A. de; 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.; St. Clair, J. M.; Wennberg, P. O.; VandenBoer, T. C.; Markovic, M. Z.; Murphy, J.G.; Harley, R. A.; Goldstein, A. H. (Copernicus Publications, 2014-05-21)
      Petroleum and dairy operations are prominent sources of gas-phase organic compounds in California's San Joaquin Valley. It is essential to understand the emissions and air quality impacts of these relatively understudied ...
    • Conversion of hydroperoxides to carbonyls in field and laboratory instrumentation: Observational bias in diagnosing pristine versus anthropogenically controlled atmospheric chemistry 

      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.; Gouw, J. de; Wisthaler, A.; Hansel, A.; Wennberg, P. O.; Seinfeld, J. H.; Keutsch, F. N. (AGU Pubication, 2014-11-17)
      Atmospheric volatile organic compound (VOC) oxidation mechanisms under pristine (rural/remote) and urban (anthropogenically‐influenced) conditions follow distinct pathways due to large differences in nitrogen oxide (NOx) ...
    • Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds 

      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, H.; Wennberg, P. O. (Copernicus Publications, 2014-12-19)
      The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative atmospheric chamber campaign that occurred during January 2014. FIXCIT is the laboratory component of a synergistic ...