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Observations of large reductions in the NO/NO_y ratio near the mid-latitude tropopause and the role of heterogeneous chemistry

Keim, E. R. and Fahey, D. W. and Del Negro, L. A. and Woodbridge, E. L. and Gao, R. S. and Wennberg, P. O. and Cohen, R. C. and Stimpfle, R. M. and Kelly, K. K. and Hintsa, E. J. and Wilson, J. C. and Jonsson, H. H. and Dye, J. E. and Baumgardner, D. and Kawa, S. R. and Salawitch, R. J. and Proffitt, M. H. and Loewenstein, M. and Podolske, J. R. and Chan, K. R. (1996) Observations of large reductions in the NO/NO_y ratio near the mid-latitude tropopause and the role of heterogeneous chemistry. Geophysical Research Letters, 23 (22). pp. 3223-3226. ISSN 0094-8276. https://resolver.caltech.edu/CaltechAUTHORS:20140718-115240464

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Abstract

During the 1993 NASA Stratospheric Photochemistry, Aerosols and Dynamics Expedition (SPADE), anomalously low nitric oxide (NO) was found in a distinct sunlit layer located above the mid-latitude tropopause. The presence of a significant amount of reactive nitrogen (NO_y) in the layer implies the systematic removal of NO, which is without precedent in stratospheric in situ observations. Large increases in measured chlorine monoxide (ClO) and the hydroperoxyl radical (HO_2) also were observed in the layer. Heterogeneous reaction rate constants of chlorine nitrate (ClONO_2) with hydrogen chloride (HCl) and H_2O to form nitric acid (HNO_3) on sulfate aerosol are enhanced in the NO removal layer by local increases in H_2O and aerosol surface area. The associated conversion of NO_x (= NO + NO_2) to HNO_3 is the most likely cause of the observed low NO and NO_x/NO_y values and high ClO values.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/96GL02593DOIArticle
http://onlinelibrary.wiley.com/doi/10.1029/96GL02593/abstractPublisherArticle
ORCID:
AuthorORCID
Wennberg, P. O.0000-0002-6126-3854
Jonsson, H. H.0000-0003-3043-1074
Alternate Title:Observations of large reductions in the NO/NOy ratio near the mid-latitude tropopause and the role of heterogeneous chemistry
Additional Information:© 1996 American Geophysical Union. Received June 10, 1996; revised August 14, 1996; accepted August 19, 1996. This work is supported by the High-Speed Research Program and Upper Atmosphere Research Program of NASA. The authors appreciate discussions with H. S. Johnston. ERK acknowledges postdoctoral support from the National Research Council.
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NASAUNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Issue or Number:22
Record Number:CaltechAUTHORS:20140718-115240464
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140718-115240464
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47330
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:18 Jul 2014 20:34
Last Modified:03 Oct 2019 06:52

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