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Near IR photolysis of HO_2NO_2: Implications for HO_x

Salawitch, Ross J. and Wennberg, Paul O. and Toon, Geoffrey C. and Sen, Bhaswar and Blavier, Jean-Francois (2002) Near IR photolysis of HO_2NO_2: Implications for HO_x. Geophysical Research Letters, 29 (16). Art. No. 1762. ISSN 0094-8276. doi:10.1029/2002GL015006.

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We report observations and calculations of peroxynitric acid, HO_2NO_2, in the stratosphere and upper troposphere. The simulations show that photolysis of HO_2NO_2 via excitation of purely vibrational modes at wavelengths longward of 760 nm (the near IR) can dominate loss of this species. Consideration of this photolytic pathway reduces calculated HO_2NO_2, resolving a large discrepancy between standard model calculations and observations of HO_2NO_2 at high-latitude spring. The lower calculated abundance of HO_2NO_2 reduces the efficiency of the OH + HO_2NO_2 sink of HO_x. Consideration of this process leads to large increases in calculated HO_x (20 to 60%) for high-latitude spring and better agreement with observed stratospheric abundances of HO_x. Near IR photolysis of HO_2NO_2 alters the coupling between NO_x and HO_x in stratospheric and upper tropospheric photochemical models.

Item Type:Article
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URLURL TypeDescription DOIArticle Information
Wennberg, Paul O.0000-0002-6126-3854
Toon, Geoffrey C.0000-0003-4174-7541
Alternate Title:Near IR photolysis of HO2NO2: Implications for HOx
Additional Information:© 2002 by the American Geophysical Union. Received 27 February 2002; revised 16 May 2002; accepted 21 May 2002; published 20 August 2002. We thank Gary Knight and Coleen Roehl for making available measurements of HO_2NO_2 cross sections prior to publication and the anonymous reviewers for helpful comments. This work was funded by the NASA Upper Atmosphere Research, Atmospheric Chemistry Modeling and Analysis, and Atmospheric Effects of Aviation Programs. Research at the Jet Propulsion Laboratory, California Institute of Technology, is performed under contract with the National Aeronautics and Space Administration.
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Issue or Number:16
Record Number:CaltechAUTHORS:20140618-120357826
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Official Citation:Salawitch, R. J., P. O. Wennberg, G. C. Toon, B. Sen, and J.-F. Blavier, Near IR photolysis of HO2NO2: Implications for HOx, Geophys. Res. Lett., 29(16), doi:10.1029/2002GL015006, 2002
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46337
Deposited By: Tony Diaz
Deposited On:18 Jun 2014 19:15
Last Modified:10 Nov 2021 17:24

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