Search Results - "Oltmans, S"

Increasing springtime ozone mixing ratios in the free troposphere over western North America by Cooper, O. R, Parrish, D. D, Stohl, A, Trainer, M, Nédélec, P, Thouret, V, Cammas, J. P, Oltmans, S. J, Johnson, B. J, Tarasick, D, Leblanc, T, McDermid, I. S, Jaffe, D, Gao, R, Stith, J, Ryerson, T, Aikin, K, Campos, T, Weinheimer, A, Avery, M. A

“…In the lowermost layer of the atmosphere—the troposphere—ozone is an important source of the hydroxyl radical, an oxidant that breaks down most pollutants and…”
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Reversal of Long‐Term Trend in Baseline Ozone Concentrations at the North American West Coast by Parrish, D. D., Petropavlovskikh, I., Oltmans, S. J.

“…Changes in baseline (here understood as representative of continental to hemispheric scales) tropospheric ozone concentrations that have occurred over western…”
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Technical Note: Ozonesonde climatology between 1995 and 2011: description, evaluation and applications by Tilmes, S, Lamarque, J.-F, Emmons, L. K, Conley, A, Schultz, M. G, Saunois, M, Thouret, V, Thompson, A. M, Oltmans, S. J, Johnson, B, Tarasick, D

“…An ozone climatology based on ozonesonde measurements taken over the last 17 yr has been constructed for model evaluation and comparisons to other…”
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Stratospheric influence on surface ozone in the Los Angeles area during late spring and early summer of 2010 by Langford, A. O., Brioude, J., Cooper, O. R., Senff, C. J., Alvarez II, R. J., Hardesty, R. M., Johnson, B. J., Oltmans, S. J.

“…The influence of stratosphere‐to‐troposphere transport (STT) on surface ozone (O3) concentrations in the greater Los Angeles area during the CalNex and…”
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Recent tropospheric ozone changes – A pattern dominated by slow or no growth by Oltmans, S.J., Lefohn, A.S., Shadwick, D., Harris, J.M., Scheel, H.E., Galbally, I., Tarasick, D.W., Johnson, B.J., Brunke, E.-G., Claude, H., Zeng, G., Nichol, S., Schmidlin, F., Davies, J., Cuevas, E., Redondas, A., Naoe, H., Nakano, T., Kawasato, T.

“…Longer-term (i.e., 20–40 years) tropospheric ozone (O3) time series obtained from surface and ozonesonde observations have been analyzed to assess possible…”
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Understanding high wintertime ozone pollution events in an oil- and natural gas-producing region of the western US by Ahmadov, R, McKeen, S, Trainer, M, Banta, R, Brewer, A, Brown, S, Edwards, P. M, de Gouw, J. A, Frost, G. J, Gilman, J, Helmig, D, Johnson, B, Karion, A, Koss, A, Langford, A, Lerner, B, Olson, J, Oltmans, S, Peischl, J, Pétron, G, Pichugina, Y, Roberts, J. M, Ryerson, T, Schnell, R, Senff, C, Sweeney, C, Thompson, C, Veres, P. R, Warneke, C, Wild, R, Williams, E. J, Yuan, B, Zamora, R

“…Recent increases in oil and natural gas (NG) production throughout the western US have come with scientific and public interest in emission rates, air quality…”
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A re-evaluated Canadian ozonesonde record: measurements of the vertical distribution of ozone over Canada from 1966 to 2013 by Tarasick, D. W, Davies, J, Smit, H. G. J, Oltmans, S. J

“…In Canada routine ozone soundings have been carried at Resolute Bay since 1966, making this record the longest in the world. Similar measurements started in…”
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Arctic smoke – record high air pollution levels in the European Arctic due to agricultural fires in Eastern Europe in spring 2006 by Stohl, A., Berg, T., Burkhart, J. F., Fjǽraa, A. M., Forster, C., Herber, A., Hov, Ø., Lunder, C., McMillan, W. W., Oltmans, S., Shiobara, M., Simpson, D., Solberg, S., Stebel, K., Ström, J., Tørseth, K., Treffeisen, R., Virkkunen, K., Yttri, K. E.

“…In spring 2006, the European Arctic was abnormally warm, setting new historical temperature records. During this warm period, smoke from agricultural fires in…”
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Quantifying stratosphere-troposphere transport of ozone using balloon-borne ozonesondes, radar windprofilers and trajectory models by Tarasick, D.W., Carey-Smith, T.K., Hocking, W.K., Moeini, O., He, H., Liu, J., Osman, M.K., Thompson, A.M., Johnson, B.J., Oltmans, S.J., Merrill, J.T.

“…In a series of 10-day campaigns in Ontario and Quebec, Canada, between 2005 and 2007, ozonesondes were launched twice daily in conjunction with continuous…”
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The Indian Ocean Experiment: Widespread Air Pollution from South and Southeast Asia by Lelieveld, J., Crutzen, P. J., Ramanathan, V., Andreae, M. O., Brenninkmeijer, C. A. M., Campos, T., Cass, G. R., Dickerson, R. R., Fischer, H., de Gouw, J. A., Hansel, A., Jefferson, A., Kley, D., de Laat, A. T. J., Lal, S., Lawrence, M. G., Lobert, J. M., Mayol-Bracero, O. L., Mitra, A. P., Novakov, T., Oltmans, S. J., Prather, K. A., Reiner, T., Rodhe, H., Scheeren, H. A., Sikka, D., Williams, J.

“…The Indian Ocean Experiment (INDOEX) was an international, multiplatform field campaign to measure long-range transport of air pollution from South and…”
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Long-term changes in tropospheric ozone by Oltmans, S.J., Lefohn, A.S., Harris, J.M., Galbally, I., Scheel, H.E., Bodeker, G., Brunke, E., Claude, H., Tarasick, D., Johnson, B.J., Simmonds, P., Shadwick, D., Anlauf, K., Hayden, K., Schmidlin, F., Fujimoto, T., Akagi, K., Meyer, C., Nichol, S., Davies, J., Redondas, A., Cuevas, E.

“…Tropospheric ozone changes are investigated using a selected network of surface and ozonesonde sites to give a broad geographic picture of long-term…”
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Seasonal variability of atmospheric nitrogen oxides and non-methane hydrocarbons at the GEOSummit station, Greenland by Kramer, L. J, Helmig, D, Burkhart, J. F, Stohl, A, Oltmans, S, Honrath, R. E

“…Measurements of atmospheric nitrogen oxides NOx (NOx = NO + NO2), peroxyacetyl nitrate (PAN), NOy, and non-methane hydrocarbons (NMHC) were taken at the…”
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Origin of springtime ozone enhancements in the lower troposphere over Beijing: in situ measurements and model analysis by Huang, J, Liu, H, Crawford, J. H, Chan, C, Considine, D. B, Zhang, Y, Zheng, X, Zhao, C, Thouret, V, Oltmans, S. J, Liu, S. C, Jones, D. B. A, Steenrod, S. D, Damon, M. R

“…Ozone (O3) concentrations in the lower troposphere (LT) over Beijing have significantly increased over the past 2 decades as a result of rapid…”
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Measurement of western U.S. baseline ozone from the surface to the tropopause and assessment of downwind impact regions by Cooper, O. R., Oltmans, S. J., Johnson, B. J., Brioude, J., Angevine, W., Trainer, M., Parrish, D. D., Ryerson, T. R., Pollack, I., Cullis, P. D., Ives, M. A., Tarasick, D. W., Al-Saadi, J., Stajner, I.

“…Since 1997, baseline ozone monitoring from the surface to the tropopause along the U.S. west coast has been limited to the weekly ozonesondes from Trinidad…”
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Seasonal cycles of O3 in the marine boundary layer: Observation and model simulation comparisons by Parrish, D. D., Galbally, I. E., Lamarque, J.‐F., Naik, V., Horowitz, L., Shindell, D. T., Oltmans, S. J., Derwent, R., Tanimoto, H., Labuschagne, C., Cupeiro, M.

“…We present a two‐step approach for quantitatively comparing modeled and measured seasonal cycles of O3: (1) fitting sine functions to monthly averaged…”
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High-resolution tropospheric ozone fields for INTEX and ARCTAS from IONS ozonesondes by Tarasick, D. W., Jin, J. J., Fioletov, V. E., Liu, G., Thompson, A. M., Oltmans, S. J., Liu, J., Sioris, C. E., Liu, X., Cooper, O. R., Dann, T., Thouret, V.

“…The IONS‐04, IONS‐06, and ARC‐IONS ozone sounding campaigns over North America in 2004, 2006, and 2008 obtained approximately 1400 profiles, in five series of…”
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An assessment of changing ozone loss rates at South Pole: Twenty-five years of ozonesonde measurements by Hassler, B., Daniel, J. S., Johnson, B. J., Solomon, S., Oltmans, S. J.

“…In 2010, 25 years of regular, year‐round ozone soundings at South Pole station, Antarctica, were completed. These measurements provide unique information about…”
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A new interpretation of total column BrO during Arctic spring by Salawitch, R. J., Canty, T., Kurosu, T., Chance, K., Liang, Q., da Silva, A., Pawson, S., Nielsen, J. E., Rodriguez, J. M., Bhartia, P. K., Liu, X., Huey, L. G., Liao, J., Stickel, R. E., Tanner, D. J., Dibb, J. E., Simpson, W. R., Donohoue, D., Weinheimer, A., Flocke, F., Knapp, D., Montzka, D., Neuman, J. A., Nowak, J. B., Ryerson, T. B., Oltmans, S., Blake, D. R., Atlas, E. L., Kinnison, D. E., Tilmes, S., Pan, L. L., Hendrick, F., Van Roozendael, M., Kreher, K., Johnston, P. V., Gao, R. S., Johnson, B., Bui, T. P., Chen, G., Pierce, R. B., Crawford, J. H., Jacob, D. J.

“…Emission of bromine from sea‐salt aerosol, frost flowers, ice leads, and snow results in the nearly complete removal of surface ozone during Arctic spring…”
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Trends and variability of midlatitude stratospheric water vapour deduced from the re-evaluated Boulder balloon series and HALOE by Scherer, M., Vömel, H., Fueglistaler, S., Oltmans, S. J., Staehelin, J.

“…This paper presents an updated trend analysis of water vapour in the lower midlatitude stratosphere from the Boulder balloon-borne NOAA frostpoint hygrometer…”
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Seasonal to decadal variations of water vapor in the tropical lower stratosphere observed with balloon-borne cryogenic frost point hygrometers by Fujiwara, M., Vömel, H., Hasebe, F., Shiotani, M., Ogino, S.-Y., Iwasaki, S., Nishi, N., Shibata, T., Shimizu, K., Nishimoto, E., Valverde Canossa, J. M., Selkirk, H. B., Oltmans, S. J.

“…We investigated water vapor variations in the tropical lower stratosphere on seasonal, quasi-biennial oscillation (QBO), and decadal time scales using…”
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