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Keim, E.R., McKeen, S.A., Gao, R.S., Donnelly, S.G., Wamsley, R.C., Del Negro, L.A., Fahey, D.W., Hanisco, T.F., Lanzendorf, E.J., Proffitt, M.H., Margitan, J.J., Hintsa, E.J., Jaeglé, L., Webster, C.R., May, R.D., Scott, D.C., Salawitch, R.J., Wilson, J.C., McElroy, C.T., Atlas, E.L., Flocke, F. and Bui, T.P. (1999). NOy partitioning from measurements of nitrogen and hydrogen radicals in the upper troposphere. Geophysical Research Letters 26: doi: 10.1029/1998GL900219. issn: 0094-8276. |
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Recent studies using NO, NOy, OH and HO2 (HOx) observations have postulated acetone and convection of peroxides as significant sources of HOx in the upper troposphere (UT). This work focuses on the effect these additional HOx sources have on the modeled NOy partitioning and comparisons of the modeled NOx/NOy ratio to observations. The measured NOx/NOy ratio is usually much higher than predicted regardless of the presence of acetone in the model. The exception occurs for air parcels having low NOy and O3 values. For these air parcels the measured NOx/NOy ratio is much lower than the calculated ratio unless acetone is included in the model. In all cases acetone increases the fraction of NOy that is peroxy acetyl nitrate (PAN) from typical values of much less than 0.1 to values as high as 0.35. Including acetone also reduces the scatter in a comparison between modeled and observed NOx/NOy ratios. ¿ 1999 American Geophysical Union |
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Keywords
Atmospheric Composition and Structure, Middle atmosphere—composition and chemistry, Atmospheric Composition and Structure, Troposphere—composition and chemistry |
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Publisher
American Geophysical Union
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