Search Results - "Proffitt, MH"

Hydrogen Radicals, Nitrogen Radicals, and the Production of O$_3$ in the Upper Troposphere by Wennberg, P. O., Hanisco, T. F., Jaeglé, L., Jacob, D. J., Hintsa, E. J., Lanzendorf, E. J., Anderson, J. G., R.-S. Gao, Keim, E. R., Donnelly, S. G., Del Negro, L. A., Fahey, D. W., McKeen, S. A., Salawitch, R. J., Webster, C. R., May, R. D., Herman, R. L., Proffitt, M. H., Margitan, J. J., Atlas, E. L., Schauffler, S. M., Flocke, F., McElroy, C. T., Bui, T. P.

“…The concentrations of the hydrogen radicals OH and HO$_2$ in the middle and upper troposphere were measured simultaneously with those of NO, O$_3$, CO, H$_2$O,…”
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Hydrogen radicals, nitrogen radicals, and the production of O3 in the upper troposphere by Wennberg, PO, Hanisco, TF, Jaegle, L, Jacob, DJ, Hintsa, EJ, Lanzendorf, EJ, Anderson, JG, Gao, R, Keim, ER, Donnelly, SG, Negro, LAD, Fahey, DW, McKeen, SA, Salawitch, RJ, Webster, CR, May, RD, Herman, RL, Proffitt, MH, Margitan, JJ, Atlas, EL, Schauffler, SM, Flocke, F, McElroy, CT, Bui, TP

“…The concentrations of the hydrogen radicals OH and HO2 in the middle and upper troposphere were measured simultaneously with those of NO, O3, CO, H2O, CH4,…”
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Observed OH and HO2 in the upper troposphere suggest a major source from convective injection of peroxides by Jaeglé, L., Jacob, D. J., Wennberg, P. O., Spivakovsky, C. M., Hanisco, T. F., Lanzendorf, E. J., Hintsa, E. J., Fahey, D. W., Keim, E. R., Proffitt, M. H., Atlas, E. L., Flocke, F., Schauffler, S., McElroy, C. T., Midwinter, C., Pfister, L., Wilson, J. C.

“…ER‐2 aircraft observations of OH and HO2 concentrations in the upper troposphere during the NASA/STRAT campaign are interpreted using a photochemical model…”
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Mixing of polar vortex air into middle latitudes as revealed by tracer-tracer scatterplots by Waugh, D. W., Plumb, R. A., Elkins, J. W., Fahey, D. W., Boering, K. A., Dutton, G. S., Volk, C. M., Keim, E., Gao, R.‐S., Daube, B. C., Wofsy, S. C., Loewenstein, M., Podolske, J. R., Chan, K. R., Proffitt, M. H., Kelly, K. K., Newman, P. A., Lait, L. R.

“…The occurrence of mixing of polar vortex air with midlatitude air is investigated by examining the scatterplots of insitu measurements of long‐lived tracers…”
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Monthly averaged ozone and nitrous oxide from the Improved Limb Atmospheric Spectrometer (ILAS) in the Northern and Southern Hemisphere polar regions by Khosrawi, Farahnaz, Müller, Rolf, Proffitt, Michael H., Nakajima, Hideaki

“…Northern and southern hemispheric averaged ozone (O3) and nitrous oxide (N2O) measured by the Improved Limb Atmospheric Spectrometer (ILAS) were used to…”
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Exchange between the upper tropical troposphere and the lower stratosphere studied with aircraft observations by Tuck, A. F., Hovde, S. J., Kelly, K. K., Mahoney, M. J., Proffitt, M. H., Richard, E. C., Thompson, T. L.

“…Exchange between the upper tropical troposphere and the lower stratosphere is considered by examining WB57F and ER‐2 aircraft observations of water, ozone,…”
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Quantifying Transport between the Tropical and Mid-Latitude Lower Stratosphere by Volk, C. M., Elkins, J. W., Fahey, D. W., Salawitch, R. J., Dutton, G. S., Gilligan, J. M., Proffitt, M. H., Loewenstein, M., Podolske, J. R., Minschwaner, K., Margitan, J. J., Chan, K. R.

“…Airborne in situ observations of molecules with a wide range of lifetimes (methane, nitrous oxide, reactive nitrogen, ozone, chlorinated halocarbons, and…”
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A comparison of observations and model simulations of NOx/NOy in the lower stratosphere by Gao, R. S., Fahey, D. W., Del Negro, L. A., Donnelly, S. G., Keim, E. R., Neuman, J. A., Teverovskaia, E., Wennberg, P. O., Hanisco, T. F., Lanzendorf, E. J., Proffitt, M. H., Margitan, J. J., Wilson, J. C., Elkins, J. W., Stimpfle, R. M., Cohen, R. C., McElroy, C. T., Bui, T. P., Salawitch, R. J., Brown, S. S., Ravishankara, A. R., Portmann, R. W., Ko, M. K. W., Weisenstein, D. K., Newman, P. A.

“…Extensive airborne measurements of the reactive nitrogen reservoir (NOy) and its component nitric oxide (NO) have been made in the lower stratosphere. Box…”
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Seasonally averaged ozone and nitrous oxide in the Northern Hemisphere lower stratosphere by Proffitt, M. H., Aikin, K., Tuck, A. F., Margitan, J. J., Webster, C. R., Toon, G. C., Elkins, J. W.

“…Northern Hemisphere ozone (O3) measurements in the lower stratosphere made from 1989 to 1997 are presented along with simultaneous measurements of the…”
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Observation of stratospheric ozone depletion associated with Delta II rocket emissions by Ross, M. N., Toohey, D. W., Rawlins, W. T., Richard, E. C., Kelly, K. K., Tuck, A. F., Proffitt, M. H., Hagen, D. E., Hopkins, A. R., Whitefield, P. D., Benbrook, J. R., Sheldon, W. R.

“…Ozone, chlorine monoxide, methane, and submicron particulate concentrations were measured in the stratospheric plume wake of a Delta II rocket powered by a…”
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The contribution of mixing in Lagrangian photochemical predictions of polar ozone loss over the Arctic in summer 1997 by Fairlie, T. Duncan, Pierce, R. Bradley, Al‐Saadi, Jassim. A., Grose, William L., Russell, James M., Proffitt, Michael H., Webster, Christopher R.

“…Measurements from the Halogen Occultation Experiment, together with assimilated winds, temperatures, and diabatic heating rates from the NASA Goddard data…”
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Ozone loss in the Arctic polar vortex inferred from high-altitude aircraft measurements by Proffitt, M. H., Margitan, J. J., Kelly, K. K., Loewenstein, M., Podolske, J. R.

“…The Arctic polar vortex in winter is known to be chemically primed for ozone depletion, yet it does not exhibit the large seasonal ozone decrease that…”
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Modulation of middle and upper tropospheric ozone at northern midlatitudes by the El Niño/Southern Oscillation by Langford, A. O., O'Leary, T. J., Masters, C. D., Aikin, K. C., Proffitt, M. H.

“…A five‐year time series of lidar profiles from a site in Colorado is used to investigate the sources and scales of variability for ozone in the free…”
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Chemical Loss of Ozone in the Arctic Polar Vortex in the Winter of 1991-1992 by Salawitch, R. J., Wofsy, S. C., Gottlieb, E. W., Lait, L. R., Newman, P. A., Schoeberl, M. R., Loewenstein, M., Podolske, J. R., Strahan, S. E., Proffitt, M. H., Webster, C. R., May, R. D., Fahey, D. W., Baumgardner, D., Dye, J. E., Wilson, J. C., Kelly, K. K., Elkins, J. W., Chan, K. R., Anderson, J. G.

“…In situ measurements of chlorine monoxide, bromine monoxide, and ozone are extrapolated globally, with the use of meteorological tracers, to infer the loss…”
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Comment on "On the magnitude of transport out of the Antarctic polar vortex" by Wiel M. F. Wauben et al by Tuck, A. F., Proffitt, M. H.

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Ozone Loss Inside the Northern Polar Vortex During the 1991-1992 Winter by Proffitt, M. H., Aikin, K., Margitan, J. J., Loewenstein, M., Podolske, J. R., Weaver, A., Chan, K. R., Fast, H., Elkins, J. W.

“…Measurements made in the outer ring of the northern polar vortex from October 1991 through March 1992 reveal an altitude-dependent change in ozone, with a…”
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Partitioning of the reactive nitrogen reservoir in the lower stratosphere of the southern hemisphere: Observations and modeling by Gao, R. S., Fahey, D. W., Salawitch, R. J., Lloyd, S. A., Anderson, D. E., DeMajistre, R., McElroy, C. T., Woodbridge, E. L., Wamsley, R. C., Donnelly, S. G., Del Negro, L. A., Proffitt, M. H., Stimpfle, R. M., Kohn, D. W., Kawa, S. R., Lait, L. R., Loewenstein, M., Podolske, J. R., Keim, E. R., Dye, J. E., Wilson, J. C., Chan, K. R.

“…Measurements of nitric oxide (NO), nitrogen dioxide (NO2), and total reactive nitrogen (NOy = NO + NO2 + NO3 + HNO3 + ClONO2 + 2N2O5 + …) were made during…”
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Intercomparison of ATMOS, SAGE II, and ER-2 Observations in Arctic Vortex and Extra-Vortex Air Masses during Spring 1993 by Michelsen, H. A., Manney, G. L., Webster, C. R., May, R. D., Gunson, M. R., Baumgardner, D., Kelly, K. K., Loewenstein, M., Podolske, J. R., Proffitt, M. H., Wofsy, S. C., Yue, G. K.

“…We have compared measured abundances of NOy, O3, H2O, CH4, HCl, and N2O from ATMOS and aerosol from SAGE II from inside and outside the Arctic vortex with in…”
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Ozone destruction and production rates between spring and autumn in the Arctic stratosphere by Fahey, D. W., Gao, R. S., Del Negro, L. A., Keim, E. R., Kawa, S. R., Salawitch, R. J., Wennberg, P. O., Hanisco, T. F., Lanzendorf, E. J., Perkins, K. K., Lloyd, S. A., Swartz, W. H., Proffitt, M. H., Margitan, J. J., Wilson, J. C., Stimpfle, R. M., Cohen, R. C., McElroy, C. T., Webster, C. R., Loewenstein, M., Elkins, J. W., Bui, T. P.

“…In situ measurements of radical and long‐lived species were made in the lower Arctic stratosphere (18 to 20 km) between spring and early autumn in 1997. The…”
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Evolution of HCL concentrations in the lower stratosphere from 1991 to 1996 following the eruption of Mt. Pinatubo by Webster, C. R., May, R. D., Michelsen, H. A., Scott, D. C., Wilson, J. C., Jonsson, H. H., Brock, C. A., Dye, J. E., Baumgardner, D., Stimpfle, R. M., Koplow, J. P., Margitan, J. J., Proffitt, M. H., Jaeglé, L., Herman, R. L., Hu, H., Flesch, G. J., Loewenstein, M.

“…In situ measurements of hydrochloric acid in the lower stratosphere reveal that its mean abundance relative to that of total inorganic chlorine (Cly) has…”
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