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The diurnal variation of hydrogen, nitrogen, and chlorine radicals: implications for the heterogeneous production of HNO_2

Salawitch, R. J. and Wofsy, S. C. and Wennberg, P. O. and Cohen, R. C. and Anderson, J. G. and Fahey, D. W. and Gao, R. S. and Keim, E. R. and Woodbridge, E. L. and Stimpfle, R. M. and Koplow, J. P. and Kohn, D. W. and Webster, C. R. and May, R. D. and Pfister, L. and Gottlieb, E. W. and Michelsen, H. A. and Yue, G. K. and Prather, M. J. and Wilson, J. C. and Brock, C. A. and Jonsson, H. H. and Dye, J. E. and Baumgardner, D. and Proffitt, M. H. and Loewenstein, M. and Podolske, J. R. and Elkins, J. W. and Dutton, G. S. and Hintsa, E. J. and Dessler, A. E. and Weinstock, E. M. and Kelly, K. K. and Boering, K. A. and Daube, B. C. and Chan, K. R. and Bowen, S. W. (1994) The diurnal variation of hydrogen, nitrogen, and chlorine radicals: implications for the heterogeneous production of HNO_2. Geophysical Research Letters, 21 (23). pp. 2551-2554. 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 N_(2)O_(5) on sulfate aerosols agree with measured concentrations of NO, NO_(2), and ClO throughout the day, but fail to account for high concentrations of OH and HO_(2) observed near sunrise and sunset. The morning burst of [OH] and [HO_(2)] coincides with the rise of [NO] from photolysis of NO_(2), suggesting a new source of HO_(x) that photolyzes in the near UV (350 to 400 nm) spectral region. A model that allows for the heterogeneous production of HNO_(2) results in an excellent simulation of the diurnal variations of [OH] and [HO_(2)].

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Wennberg, P. O.0000-0002-6126-3854
Jonsson, H. H.0000-0003-3043-1074
Additional Information:© 1994 American Geophysical Union. Manuscript Accepted: 19 OCT 1994; Manuscript Received: 29 AUG 1994. Paper number 94GL02782. This work was supported by NASA grants NAG2-731, NAGW-1230, NAS1-19955 and NSF grant ATM-89-21119 to Harvard University. We thank J. Herman and the GSFC processing team for providing data from TOMS and P. Newman and R. Nagatani for providing data from NMC.
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Issue or Number:23
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ID Code:46627
Deposited By: Jason Perez
Deposited On:02 Jul 2014 18:03
Last Modified:03 Oct 2019 06:45

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