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Your search keyword '"Browne, E"' showing total 13 results
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13 results on '"Browne, E"'

1. Observations of total RONO2 over the boreal forest: NOx sinks and HNO3 sources

Author

Browne, E. C, Min, K.-E., Wooldridge, P. J, Apel, E., Blake, D. R, Brune, W. H, Cantrell, C. A, Cubison, M. J, Diskin, G. S, Jimenez, J. L, Weinheimer, A. J, Wennberg, P. O, Wisthaler, A., and Cohen, R. C

Subjects
Laser-Induced Fluorescence, Volatile Organic-Compounds, Ionization Mass-Spectrometry, Atmospheric Boundary-Layer, Absorption Cross-Sections, Hydroxy Alkyl Nitrates, Henrys Law Constants, Tropical Rain-Forest, Gas-Phase Reactions, Isoprene Oxidation
Published
2013

2. Observations of atmosphere-biosphere exchange of total and speciated peroxynitrates: nitrogen fluxes and biogenic sources of peroxynitrates

Author

Min, K.-E., Pusede, S. E, Browne, E. C, LaFranchi, B. W, Wooldridge, P. J, Wolfe, G. M, Harrold, S. A, Thornton, J. A, and Cohen, R. C

Subjects
BRII recipient: Cohen
Abstract

Peroxynitrates are responsible for global scale transport of reactive nitrogen. Recent laboratory observations suggest that they may also play an important role in delivery of nutrients to plant canopies. We measured eddy covariance fluxes of total peroxynitrates (ΣPNs) and three individual peroxynitrates (APNs ≡ PAN + PPN + MPAN) over a ponderosa pine forest during the Biosphere Effects on AeRosols and Photochemistry EXperiment 2009 (BEARPEX 2009). Concentrations of these species were also measured at multiple heights above and within the canopy. While the above-canopy daytime concentrations are nearly identical for ΣPNs and APNs, we observed the downward flux of ΣPNs to be 30–60% slower than the flux of APNs. The vertical concentration gradients of ΣPNs and APNs vary with time of day and exhibit different temperature dependencies. These differences can be explained by the production of peroxynitrates other than PAN, PPN, and MPAN within the canopy (presumably as a consequence of biogenic VOC emissions) and upward fluxes of these PN species. The impact of this implied peroxynitrate flux on the interpretation of NOx fluxes and ecosystem N exchange is discussed.

Published
2012

3. Global and regional effects of the photochemistry of CH3O2NO2: evidence from ARCTAS

Author

Browne, E. C, Perring, A. E, Wooldridge, P. J, Apel, E., Hall, S. R, Huey, L. G, Mao, J., Spencer, K. M, Clair, J. M. St., Weinheimer, A. J, Wisthaler, A., and Cohen, R. C

Subjects
BRII recipient: Cohen
Abstract

Using measurements from the NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) experiment, we show that methyl peroxy nitrate (CH3O2NO2) is present in concentrations of ~5–15 pptv in the springtime arctic upper troposphere. We investigate the regional and global effects of CH3O2NO2 by including its chemistry in the GEOS-Chem 3-D global chemical transport model. We find that at temperatures below 240 K inclusion of CH3O2NO2 chemistry results in decreases of up to ~20 % in NOx, ~20 % in N2O5, ~5 % in HNO3, ~2 % in ozone, and increases in methyl hydrogen peroxide of up to ~14 %. Larger changes are observed in biomass burning plumes lofted to high altitude. Additionally, by sequestering NOx at low temperatures, CH3O2NO2 decreases the cycling of HO2 to OH, resulting in a larger upper tropospheric HO2 to OH ratio. These results may impact some estimates of lightning NOx sources as well as help explain differences between models and measurements of upper tropospheric composition.

Published
2011

4. Nitrogen oxides and PAN in plumes from boreal fires during ARCTAS-B and their impact on ozone: an integrated analysis of aircraft and satellite observations

Author

Alvarado, M. J, Logan, J. A, Mao, J., Apel, E., Riemer, D., Blake, D., Cohen, R. C, Min, K.-E., Perring, A. E, Browne, E. C, Wooldridge, P. J, Diskin, G. S, Sachse, G. W, Fuelberg, H., Sessions, W. R, Harrigan, D. L, Huey, G., Liao, J., Case-Hanks, A., Jimenez, J. L, Cubison, M. J, Vay, S. A, Weinheimer, A. J, Knapp, D. J, Montzka, D. D, Flocke, F. M, Pollack, I. B, Wennberg, P. O, Kurten, A., Crounse, J., Clair, J. M. St., Wisthaler, A., Mikoviny, T., Yantosca, R. M, Carouge, C. C, and Le Sager, P.

Subjects
ionization mass-spectrometry, biomass burning emissions, high northern latitudes, long-range transport, carbon-monoxide, interannual variability, atmospheric chemistry, continental outflow, accurate simulation, tropospheric ozone
Published
2010

6. On the temperature dependence of organic reactivity, nitrogen oxides, ozone production, and the impact of emission controls in San Joaquin Valley, California

Author

Pusede, S. E., primary, Gentner, D. R., additional, Wooldridge, P. J., additional, Browne, E. C., additional, Rollins, A. W., additional, Min, K.-E., additional, Russell, A. R., additional, Thomas, J., additional, Zhang, L., additional, Brune, W. H., additional, Henry, S. B., additional, DiGangi, J. P., additional, Keutsch, F. N., additional, Harrold, S. A., additional, Thornton, J. A., additional, Beaver, M. R., additional, St. Clair, J. M., additional, Wennberg, P. O., additional, Sanders, J., additional, Ren, X., additional, VandenBoer, T. C., additional, Markovic, M. Z., additional, Guha, A., additional, Weber, R., additional, Goldstein, A. H., additional, and Cohen, R. C., additional

Published
2014
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10. The Chemistry of Atmosphere-Forest Exchange (CAFE) Model – Part 2: Application to BEARPEX-2007 observations

Author

Wolfe, G. M., primary, Thornton, J. A., additional, Bouvier-Brown, N. C., additional, Goldstein, A. H., additional, Park, J.-H., additional, McKay, M., additional, Matross, D. M., additional, Mao, J., additional, Brune, W. H., additional, LaFranchi, B. W., additional, Browne, E. C., additional, Min, K.-E., additional, Wooldridge, P. J., additional, Cohen, R. C., additional, Crounse, J. D., additional, Faloona, I. C., additional, Gilman, J. B., additional, Kuster, W. C., additional, de Gouw, J. A., additional, Huisman, A., additional, and Keutsch, F. N., additional

Published
2011
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13. Closing the peroxy acetyl nitrate budget: observations of acyl peroxy nitrates (PAN, PPN, and MPAN) during BEARPEX 2007

Author

LaFranchi, B. W., primary, Wolfe, G. M., additional, Thornton, J. A., additional, Harrold, S. A., additional, Browne, E. C., additional, Min, K. E., additional, Wooldridge, P. J., additional, Gilman, J. B., additional, Kuster, W. C., additional, Goldan, P. D., additional, de Gouw, J. A., additional, McKay, M., additional, Goldstein, A. H., additional, Ren, X., additional, Mao, J., additional, and Cohen, R. C., additional

Published
2009
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