Search Results - "Lefer, B."

Observations of gas- and aerosol-phase organic nitrates at BEACHON-RoMBAS 2011 by Fry, J. L, Draper, D. C, Zarzana, K. J, Campuzano-Jost, P, Day, D. A, Jimenez, J. L, Brown, S. S, Cohen, R. C, Kaser, L, Hansel, A, Cappellin, L, Karl, T, Hodzic Roux, A, Turnipseed, A, Cantrell, C, Lefer, B. L, Grossberg, N

“…At the Rocky Mountain Biogenic Aerosol Study (BEACHON-RoMBAS) field campaign in the Colorado front range, July–August 2011, measurements of gas- and…”
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Measurements of hydroxyl and hydroperoxy radicals during CalNex‐LA: Model comparisons and radical budgets by Griffith, S. M., Hansen, R. F., Dusanter, S., Michoud, V., Gilman, J. B., Kuster, W. C., Veres, P. R., Graus, M., Gouw, J. A., Roberts, J., Young, C., Washenfelder, R., Brown, S. S., Thalman, R., Waxman, E., Volkamer, R., Tsai, C., Stutz, J., Flynn, J. H., Grossberg, N., Lefer, B., Alvarez, S. L., Rappenglueck, B., Mielke, L. H., Osthoff, H. D., Stevens, P. S.

“…Measurements of hydroxyl (OH) and hydroperoxy (HO2*) radical concentrations were made at the Pasadena ground site during the CalNex‐LA 2010 campaign using the…”
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Daytime HONO vertical gradients during SHARP 2009 in Houston, TX by Wong, K. W, Tsai, C, Lefer, B, Haman, C, Grossberg, N, Brune, W. H, Ren, X, Luke, W, Stutz, J

“…Nitrous Acid (HONO) plays an important role in tropospheric chemistry as a precursor of the hydroxyl radical (OH), the most important oxidizing agent in the…”
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Modeling of daytime HONO vertical gradients during SHARP 2009 by Wong, K. W, Tsai, C, Lefer, B, Grossberg, N, Stutz, J

“…Nitrous acid (HONO) acts as a major precursor of the hydroxyl radical (OH) in the urban atmospheric boundary layer in the morning and throughout the day…”
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Impact of updated traffic emissions on HONO mixing ratios simulated for urban site in Houston, Texas by Czader, B. H, Choi, Y, Li, X, Alvarez, S, Lefer, B

“…Recent measurements in Houston show that HONO traffic emissions are 1.7% of NOx emissions, which is about twice the previously estimated value of 0.8% based on…”
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Diurnal tracking of anthropogenic CO2 emissions in the Los Angeles basin megacity during spring 2010 by Newman, S, Jeong, S, Fischer, M L, Xu, X, Haman, C L, Lefer, B, Alvarez, S, Rappenglueck, B, Kort, E A, Andrews, A E, Peischl, J, Gurney, K R, Miller, C E, Yung, Y L

“…Attributing observed CO2 variations to human or natural cause is critical to deducing and tracking emissions from observations. We have used in situ CO2 , CO,…”
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An overview of snow photochemistry: evidence, mechanisms and impacts by Grannas, A. M., Jones, A. E., Dibb, J., Ammann, M., Anastasio, C., Beine, H. J., Bergin, M., Bottenheim, J., Boxe, C. S., Carver, G., Chen, G., Crawford, J. H., Dominé, F., Frey, M. M., Guzmán, M. I., Heard, D. E., Helmig, D., Hoffmann, M. R., Honrath, R. E., Huey, L. G., Hutterli, M., Jacobi, H. W., Klán, P., Lefer, B., McConnell, J., Plane, J., Sander, R., Savarino, J., Shepson, P. B., Simpson, W. R., Sodeau, J. R., von Glasow, R., Weller, R., Wolff, E. W., Zhu, T.

“…It has been shown that sunlit snow and ice plays an important role in processing atmospheric species. Photochemical production of a variety of chemicals has…”
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Chlorine as a primary radical: evaluation of methods to understand its role in initiation of oxidative cycles by Young, C. J, Washenfelder, R. A, Edwards, P. M, Parrish, D. D, Gilman, J. B, Kuster, W. C, Mielke, L. H, Osthoff, H. D, Tsai, C, Pikelnaya, O, Stutz, J, Veres, P. R, Roberts, J. M, Griffith, S, Dusanter, S, Stevens, P. S, Flynn, J, Grossberg, N, Lefer, B, Holloway, J. S, Peischl, J, Ryerson, T. B, Atlas, E. L, Blake, D. R, Brown, S. S

“…The role of chlorine atoms (Cl) in atmospheric oxidation has been traditionally thought to be limited to the marine boundary layer, where they are produced…”
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Assessment of the sensitivity of core / shell parameters derived using the single-particle soot photometer to density and refractive index by Taylor, J. W., Allan, J. D., Liu, D., Flynn, M., Weber, R., Zhang, X., Lefer, B. L., Grossberg, N., Flynn, J., Coe, H.

“…Black carbon (BC) is the dominant absorbing aerosol in the atmosphere, and plays an important role in climate and human health. The optical properties and…”
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An MCM modeling study of nitryl chloride (ClNO 2 ) impacts on oxidation, ozone production and nitrogen oxide partitioning in polluted continental outflow by Riedel, T. P, Wolfe, G. M, Danas, K. T, Gilman, J. B, Kuster, W. C, Bon, D. M, Vlasenko, A, Li, S.-M, Williams, E. J, Lerner, B. M, Veres, P. R, Roberts, J. M, Holloway, J. S, Lefer, B, Brown, S. S, Thornton, J. A

“…Nitryl chloride (ClNO2) is produced at night by reactions of dinitrogen pentoxide (N2O5) on chloride containing surfaces. ClNO2 is photolyzed during the…”
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Vertical profiles of nitrous acid in the nocturnal urban atmosphere of Houston, TX by Wong, K. W., Oh, H.-J., Lefer, B. L., Rappenglück, B., Stutz, J.

“…Nitrous acid (HONO) often plays an important role in tropospheric photochemistry as a major precursor of the hydroxyl radical (OH) in early morning hours and…”
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Observations of ozone transport from the free troposphere to the Los Angeles basin by Neuman, J. A., Trainer, M., Aikin, K. C., Angevine, W. M., Brioude, J., Brown, S. S., de Gouw, J. A., Dube, W. P., Flynn, J. H., Graus, M., Holloway, J. S., Lefer, B. L., Nedelec, P., Nowak, J. B., Parrish, D. D., Pollack, I. B., Roberts, J. M., Ryerson, T. B., Smit, H., Thouret, V., Wagner, N. L.

“…Analysis of in situ airborne measurements from the CalNex 2010 field experiment (Research at the Nexus of Air Quality and Climate Change) show that ozone in…”
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Comparison of mixed layer heights from airborne high spectral resolution lidar, ground-based measurements, and the WRF-Chem model during CalNex and CARES by Scarino, A. J, Obland, M. D, Fast, J. D, Burton, S. P, Ferrare, R. A, Hostetler, C. A, Berg, L. K, Lefer, B, Haman, C, Hair, J. W, Rogers, R. R, Butler, C, Cook, A. L, Harper, D. B

“…The California Research at the Nexus of Air Quality and Climate Change (CalNex) and Carbonaceous Aerosol and Radiative Effects Study (CARES) field campaigns…”
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Relationship between boundary layer heights and growth rates with ground-level ozone in Houston, Texas by Haman, C. L., Couzo, E., Flynn, J. H., Vizuete, W., Heffron, B., Lefer, B. L.

“…Measurements and predictions of ambient ozone (O3), planetary boundary layer (PBL) height, the surface energy budget, wind speed, and other meteorological…”
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Modeling chemistry in and above snow at Summit, Greenland – Part 1: Model description and results by Thomas, J. L., Stutz, J., Lefer, B., Huey, L. G., Toyota, K., Dibb, J. E., von Glasow, R.

“…Sun-lit snow is increasingly recognized as a chemical reactor that plays an active role in uptake, transformation, and release of atmospheric trace gases. Snow…”
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Measurements of total hydroxyl radical reactivity during CABINEX 2009 – Part 1: field measurements by Hansen, R. F, Griffith, S. M, Dusanter, S, Rickly, P. S, Stevens, P. S, Bertman, S. B, Carroll, M. A, Erickson, M. H, Flynn, J. H, Grossberg, N, Jobson, B. T, Lefer, B. L, Wallace, H. W

“…Total hydroxyl radical (OH) reactivity was measured at the PROPHET (Program for Research on Oxidants: PHotochemistry, Emissions, and Transport) forested field…”
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In-canopy gas-phase chemistry during CABINEX 2009: sensitivity of a 1-D canopy model to vertical mixing and isoprene chemistry by Bryan, A. M, Bertman, S. B, Carroll, M. A, Dusanter, S, Edwards, G. D, Forkel, R, Griffith, S, Guenther, A. B, Hansen, R. F, Helmig, D, Jobson, B. T, Keutsch, F. N, Lefer, B. L, Pressley, S. N, Shepson, P. B, Stevens, P. S, Steiner, A. L

“…Vegetation emits large quantities of biogenic volatile organic compounds (BVOC). At remote sites, these compounds are the dominant precursors to ozone and…”
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Investigation of secondary formation of formic acid: urban environment vs. oil and gas producing region by Yuan, B, Veres, P. R, Warneke, C, Roberts, J. M, Gilman, J. B, Koss, A, Edwards, P. M, Graus, M, Kuster, W. C, Li, S.-M, Wild, R. J, Brown, S. S, Dubé, W. P, Lerner, B. M, Williams, E. J, Johnson, J. E, Quinn, P. K, Bates, T. S, Lefer, B, Hayes, P. L, Jimenez, J. L, Weber, R. J, Zamora, R, Ervens, B, Millet, D. B, Rappenglück, B, de Gouw, J. A

“…Formic acid (HCOOH) is one of the most abundant carboxylic acids in the atmosphere. However, current photochemical models cannot fully explain observed…”
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Organic aerosol composition and sources in Pasadena, California, during the 2010 CalNex campaign by Hayes, P. L., Ortega, A. M., Cubison, M. J., Froyd, K. D., Zhao, Y., Cliff, S. S., Hu, W. W., Toohey, D. W., Flynn, J. H., Lefer, B. L., Grossberg, N., Alvarez, S., Rappenglück, B., Taylor, J. W., Allan, J. D., Holloway, J. S., Gilman, J. B., Kuster, W. C., de Gouw, J. A., Massoli, P., Zhang, X., Liu, J., Weber, R. J., Corrigan, A. L., Russell, L. M., Isaacman, G., Worton, D. R., Kreisberg, N. M., Goldstein, A. H., Thalman, R., Waxman, E. M., Volkamer, R., Lin, Y. H., Surratt, J. D., Kleindienst, T. E., Offenberg, J. H., Dusanter, S., Griffith, S., Stevens, P. S., Brioude, J., Angevine, W. M., Jimenez, J. L.

“…Organic aerosols (OA) in Pasadena are characterized using multiple measurements from the California Research at the Nexus of Air Quality and Climate Change…”
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The glyoxal budget and its contribution to organic aerosol for Los Angeles, California, during CalNex 2010 by Washenfelder, R. A., Young, C. J., Brown, S. S., Angevine, W. M., Atlas, E. L., Blake, D. R., Bon, D. M., Cubison, M. J., de Gouw, J. A., Dusanter, S., Flynn, J., Gilman, J. B., Graus, M., Griffith, S., Grossberg, N., Hayes, P. L., Jimenez, J. L., Kuster, W. C., Lefer, B. L., Pollack, I. B., Ryerson, T. B., Stark, H., Stevens, P. S., Trainer, M. K.

“…Recent laboratory and field studies have indicated that glyoxal is a potentially large contributor to secondary organic aerosol mass. We present in situ…”
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