Search

Your search keyword '"Anderson, J. G"' showing total 1,023 results
Start Over Author "Anderson, J. G"
1,023 results on '"Anderson, J. G"'

1. Hydrogen Radicals, Nitrogen Radicals, and the Production of O$_3$ in the Upper Troposphere

Author

Wennberg, P. O., Hanisco, T. F., Jaeglé, L., Jacob, D. J., Hintsa, E. J., Lanzendorf, E. J., Anderson, J. G., 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., and Bui, T. P.

Published
1998

2. The diurnal variation of hydrogen, nitrogen, and chlorine radicals: Implications for the heterogeneous production of HNO 2

Author

Salawitch, R. J, Wofsy, S. C, Wennberg, P. O, Cohen, R. C, Anderson, J. G, Fahey, D. W, Gao, R. S, Keim, E. R, Woodbridge, E. L, Stimpfle, R. M, Koplow, J. P, Kohn, D. W, Webster, C. R, May, R. D, Pfister, L., Gottlieb, E. W, Michelsen, H. A, Yue, G. K, Prather, M. J, Wilson, J. C, Brock, C. A, Jonsson, H. H, Dye, J. E, Baumgardner, D., Proffitt, M. H, Loewenstein, M., Podolske, J. R, Elkins, J. W, Dutton, G. S, Hintsa, E. J, Dessler, A. E, Weinstock, E. M, Kelly, K. K, Boering, K. A, Daube, B. C, Chan, K. R, and Bowen, S. W

Subjects
environmental chambers, peroxynitric acid, stratosphere
Abstract

In situ measurements of hydrogen, nitrogen, and chlorine radicals obtained through sunrise and sunset in the lower stratosphere during SPADE are compared to results from a photochemical model constrained by observed concentrations of radical precursors and environmental conditions. Models allowing for heterogeneous hydrolysis of N2O5 on sulfate aerosols agree with measured concentrations of NO, NO2, and ClO throughout the day, but fail to account for high concentrations of OH and HO2 observed near sunrise and sunset. The morning burst of [OH] and [HO2] coincides with the rise of [NO] from photolysis of NO2, suggesting a new source of HOxthat photolyzes in the near UV (350 to 400 nm) spectral region. A model that allows for the heterogeneous production of HNO2 results in an excellent simulation of the diurnal variations of [OH] and [HO2].

Published
1994

9. ACHIEVING CLIMATE CHANGE ABSOLUTE ACCURACY IN ORBIT

Author

Wielicki, Bruce A., Young, D. F., Mlynczak, M. G., Thome, K. J., Leroy, S., Corliss, J., Anderson, J. G., Ao, C. O., Bantges, R., Best, F., Bowman, K., Brindley, H., Butler, J. J., Collins, W., Dykema, J. A., Doelling, D. R., Feldman, D. R., Fox, N., Huang, X., Holz, R., Huang, Y., Jin, Z., Jennings, D., Johnson, D. G., Jucks, K., Kato, S., Kirk-Davidoff, D. B., Knuteson, R., Kopp, G., Kratz, D. P., Liu, X., Lukashin, C., Mannucci, A. J., Phojanamongkolkij, N., Pilewskie, P., Ramaswamy, V., Revercomb, H., Rice, J., Roberts, Y., Roithmayr, C. M., Rose, F., Sandford, S., Shirley, E. L., Smith, W. L., Soden, B., Speth, P. W., Sun, W., Taylor, P. C., Tobin, D., and Xiong, X.

Published
2013

20. Chemical Loss of Ozone in the Arctic Polar Vortex in the Winter of 1991-1992

Author

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., and Anderson, J. G.

Published
1993

43. The Development and Deployment of a Ground-Based, Laser-Induced Fluorescence Instrument for the In Situ Detection of Iodine Monoxide Radicals

Author

Thurlow, M. E, Co, D. T, O'Brien, A. S, Hannun, R. A, Lapson, L. B, Hanisco, T. F, and Anderson, J. G

Subjects
Geophysics
Abstract

High abundances of iodine monoxide (IO) are known to exist and to participate in local photochemistry of the marine boundary layer. Of particular interest are the roles IO plays in the formation of new particles in coastal marine environments and in depletion episodes of ozone and mercury in the Arctic polar spring. This paper describes a ground-based instrument that measures IO at mixing ratios less than one part in 1012. The IO radical is measured by detecting laser-induced fluorescence at wavelengths longer that 500 nm. Tunable visible light is used to pump the A23/2 (v = 2) ← X23/2 (v = 0) transition of IO near 445 nm. The laser light is produced by a solid-state, Nd:YAG-pumped Ti:Sapphire laser at 5 kHz repetition rate. The laser-induced fluorescence instrument performs reliably with very high signal-to-noise ratios (>10) achieved in short integration times (<1 min). The observations from a validation deployment to the Shoals Marine Lab on Appledore Island, ME are presented and are broadly consistent with in situ observations from European Coastal Sites. Mixing ratios ranged from the instrumental detection limit (<1 pptv) to 10 pptv. These data represent the first in situ point measurements of IO in North America.

Published
2014
Full Text
View/download PDF

44. The NOx-HNO3 system in the lower stratosphere: Insights from in situ measurements and implications of J(sub HNO3)-[OH] relationship

Author

Perkins, K. K., Koch, L. C., Bonne, G. P., Wennberg, P. O., Salawitch, R. J., McElroy, C. T., Cohen, R. C., Hanisco, T. F., Hinsta, E. J., Voss, P. B., Stimpfle, R. M., Anderson, J. G., Lanzendorf, E. J., Del Negro, L. A., Gao, R. S., Bui, T. P., and Loewenstein, M.

Subjects
Photolysis -- Methods, Stratosphere -- Research, Nitric acid -- Research, Chemicals, plastics and rubber industries
Abstract

The situ observations were used to evaluate the primary mechanisms that control NOx-HNO3 exchange and to understand their control over the partitioning between NO2 and HNO3 in regions of continuous sunlight. The steady-state description of NOx-HNO3 exchange reveals the significant influence of the tight correlation between the photolysis rate of HNO3 and [OH] established in situ measurements throughout the lower stratosphere.

Published
2001

45. Establishing the dependence of [HO2]/[OH] on temperature, halogen loading, O3, and NOx based on in the situ measurements from the NASA ER-2

Author

Lanzendorf, E. J., Wennberg, P. O., Stimpfle, R. M., Gao, R. S., Bui, T. P., Hanisco, T. F., Cohen, R. C., Anderson, J. G., and Margitan, J. J.

Subjects
United States. National Aeronautics and Space Administration -- Investigations, Ozone -- Research, Company legal issue, Chemicals, plastics and rubber industries
Abstract

In situ observations of OH and HO2 from the Airborne Southern Hemisphere Ozone Experiment/Measurements for Assessing the Effects of Stratospheric Aircraft (ASHOE/MAESA), Stratospheric TRacers of Atmospheric Transport (STRAT), and Polar Ozone Loss in the Arctic Region in Summer (POLARIS) NASA ER-2 field campaigns are used to examine the partitioning of HOx in the lower stratosphere (tropopause to ~21 km) and upper troposphere. The concentration of HO2 depends on [OH], which, to first order, was observed to be a simple function of the solar zenith angle in the lower stratosphere.

Published
2001

46. Sources, sinks, and the distribution of OH in the lower stratosphere

Author

Hanisco, T. F., Perkins, K. K., Anderson, J. G., Gao, R. S., Margitan, J. J., Wennberg, P. O., Lanzendorf, E. J., Voss, P. B., Stimpfle, R. M., Fahey, D., Cohen, R. C., Salawitch, R. J., Hintsa, E. J., Midwinter, C., and McElroy, C. T.

Subjects
United States. National Aeronautics and Space Administration -- Research, Hydroxylation -- Research, Stratosphere -- Research, Chemicals, plastics and rubber industries
Abstract

The extensive measurement campaigns by the NASA ER-2 research aircraft have obtained a nearly pole-to-pole database of the species that control HOx (OH + HO2) chemistry. The measurements in the lower stratosphere shows a remarkably tight correlation of OH concentration with the solar zenith angle (SZA).

Published
2001

Catalog

Books, media, physical & digital resources
See catalog results