Search Results - "Shepson, P.B."

A study of relationships between isoprene, its oxidation products, and ozone, in the Lower Fraser Valley, BC by Biesenthal, T.A., Wu, Q., Shepson, P.B., Wiebe, H.A., Anlauf, K.G., Mackay, G.I.

“…As part of the Pacific '93 Oxidant Study that took place in the summer in the Lower Fraser Valley of British Columbia, we conducted measurements of isoprene,…”
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Wood smoke: measurement of the mutagenic activities of its gas- and particulate-phase photooxidation products by Kleindienst, Tadeusz E, Shepson, Paul B, Edney, Edward O, Claxton, Larry D, Cupitt, Larry T

“…Dilute mixtures of wood combustion emissions (with and without additional NO sub(x)) were irradiated in a 22.7-m super(3) Teflon smog chamber. The effluent was…”
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Comparison of techniques for measurement of ambient levels of hydrogen peroxide by Kleindienst, Tadeusz E, Shepson, Paul B, Hodges, Dennis N, Nero, Chris M, Arnts, Robert R, Dasgupta, Purnendu K, Hwang, Hoon, Kok, Gregory L, Lind, John A, Lazrus, Allan L, Mackay, Gervase I, Mayne, Laura K, Schiff, Harold I

“…A study was conducted to measure hydrogen peroxide (H sub(2)O sub(2)) from three sources: (1) zero air in the presence and absence of common interferences, (2)…”
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Impacts of snowpack emissions on deduced levels of OH and peroxy radicals at Summit, Greenland by Yang, J., Honrath, R.E., Peterson, M.C., Dibb, J.E., Sumner, A.L., Shepson, P.B., Frey, M., Jacobi, H.-W., Swanson, A., Blake, N.

“…Levels of OH and peroxy radicals in the atmospheric boundary layer at Summit, Greenland, a location surrounded by snow from which HO x radical precursors are…”
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Distribution and trends of oxygenated hydrocarbons in the high Arctic derived from measurements in the atmospheric boundary layer and interstitial snow air during the ALERT2000 field campaign by Boudries, H., Bottenheim, J.W., Guimbaud, C., Grannas, A.M., Shepson, P.B., Houdier, S., Perrier, S., Dominé, F.

“…Oxygenated hydrocarbons, including for the first time alcohols, in the atmosphere and snow-pack interstitial air were measured at Alert, Nunavut, Canada from…”
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Atmospheric chemistry of formaldehyde in the Arctic troposphere at Polar Sunrise, and the influence of the snowpack by Sumner, A.L, Shepson, P.B, Grannas, A.M, Bottenheim, J.W, Anlauf, K.G, Worthy, D, Schroeder, W.H, Steffen, A, Dominé, F, Perrier, S, Houdier, S

“…The role of formaldehyde in the atmospheric chemistry of the Arctic marine boundary layer has been studied during both polar day and night at Alert, Nunavut,…”
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Analysis of Air Quality Data Using Positive Matrix Factorization by Paterson, Kurtis G, Sagady, Jessica L, Hooper, Dianne L, Bertman, Steve B, Carroll, Mary Anne, Shepson, Paul B

“…Positive matrix factorization (PMF) was applied to air quality and temperature data collected as part of the Program for Research on Oxidants:  Photochemistry,…”
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The mutagenic activity of the products of ozone reaction with propylene in the presence and absence of nitrogen dioxide by Shepson, Paul B, Kleindienst, Tadeusz E, Edney, Edward O, Cupitt, Larry T, Claxton, Larry D

“…This study was performed to determine if propylene reaction with ozone could account for the large mutagenic activity the authors have observed in irradiated…”
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Henry's Law Constants and Removal Processes for Several Atmospheric β-Hydroxy Alkyl Nitrates by Shepson, Paul B, Mackay, Elizabeth, Muthuramu, Kayambu

“…The oxidation of atmospheric alkenes by OH radicals results in small yields of β-hydroxy alkyl nitrates that can then provide a vehicle for the ultimate…”
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Measurements of Photolyzable Halogen Compounds and Bromine Radicals During the Polar Sunrise Experiment 1997 by Impey, G A, Mihele, C M, Anlauf, K G, Barrie, LA, Hastie, DR, Shepson, P B

“…As part of the Polar Sunrise Experiment (PSE) 1997, concentrations of halogen species thought to be involved in ground level Arctic ozone depletion were made…”
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Production and distribution of organic nitrates, and their relationship to carbonyl compounds in an urban environment by O'Brien, J.M., Shepson, P.B., Wu, Q., Biesenthal, T., Bottenheim, J.W., Wiebe, H.A., Anlauf, K.G., Brickell, P.

“…As part of the PACIFIC '93 field study, measurements of a series of hydrocarbon oxidation products, specifically 12 alkyl nitrates, six hydroxy nitrates and…”
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Observational evidence for the impact of the lake breeze circulation on ozone concentrations in Southern Ontario by Hastie, D.R., Narayan, J., Schiller, C., Niki, H., Shepson, P.B., Sills, D.M.L., Taylor, P.A., Moroz, Wm.J., Drummond, J.W., Reid, N., Taylor, R., Roussel, P.B., Melo, O.T.

“…Very rapid increases in the concentrations of ozone and ozone precursors, in the late afternoon, have been observed at a rural and an urban site in southern…”
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Emission ratios and photochemical production efficiencies of nitrogen oxides, ketones, and aldehydes in the Lower Fraser Valley during the Summer Pacific 1993 oxidant study by Li, Shao-Meng, Anlauf, K.G., Wiebe, H.A., Bottenheim, J.W., Shepson, P.B., Biesenthal, T.

“…Observations made at a ground site east of Vancouver, Canada, were used in a principal component analysis (PCA) to derive (1) the emission ratios (ER) SO 2, NO…”
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Summertime NO x, NO y, and ozone at a site in rural Ontario by Hastie, D.R., Shepson, P.B., Reid, N., Roussel, P.B., Melo, O.T.

“…Measurements of NO y , NO x NO, SO 2, PAN, HNO 3, O 3, and CO, obtained as part of SONTOS, have been examined to give a picture of the typical chemistry at…”
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Modeling of ozone formation at a rural site in Southern Ontario by Plummer, D.A., McConnell, J.C., Shepson, P.B., Hastie, D.R., Niki, H.

“…A one-dimensional time-dependent photochemical diffusion model has been used to simulate the chemical and vertical transport processes occurring at a rural…”
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Summertime NOx, NOy, and ozone at a site in rural Ontario by HASTIE, D. R, SHEPSON, P. B, REID, N, ROUSSEL, P. B, MELO, O. T

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MS/MS analysis of the products of toluene photooxidation and measurement of their mutagenic activity by Dumdei, Bruce E, Kenny, Donald V, Shepson, Paul B, Kleindienst, Tadeusz E, Nero, Chris M, Cupitt, Larry T, Claxton, Larry D

“…Products of the photooxidation of toluene from an irradiated 5.1 ppm toluene/0.9 ppm NO sub(x) mixture were identified by use of a triple-quadrupole MS/MS…”
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Acetaldehyde: the mutagenic activity of its photooxidation products by Shepson, Paul B, Kleindienst, Tadeusz E, Edney, Edward O, Nero, Chris M, Cupitt, Larry T, Claxton, Larry D

“…Salmonella typhimurium strain ta100 was exposed to the gas-phase products of acetaldehyde photooxidation. Significant mutagenic activity was observed when the…”
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The production of organic nitrates from hydroxyl and nitrate radical reaction with propylene by SHEPSON, P. B, EDNEY, E. O, KLEINDIENST, T. E, PITTMAN, J. H, NAMIE, G. R, CUPITT, L. T

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Mutagenic activity of the products of propylene photooxidation by Kleindienst, Tadeusz E, Shepson, Paul B, Edney, Edward O, Cupitt, Larry T, Claxton, Larry D

“…The reactants and products in irradiated propylene/NO sub(x) mixtures were brought to a steady-state distribution in a Telfon smog chamber operated in a…”
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