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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. (1994). The diurnal variation of hydrogen, nitrogen, and chlorine radicals: Implications for the heterogeneous production of HNO2. Geophysical Research Letters 21: doi: 10.1029/94GL02782. issn: 0094-8276. |
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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 HOx that 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>. ¿ American Geophysical Union 1994 |
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Keywords
Atmospheric Composition and Structure, Troposphere—composition and chemistry |
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Publisher
American Geophysical Union
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