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The effect of the novel HO_2 + NO → HNO_3 reaction channel at South Pole, Antarctica

Boxe, C. S. and Hamer, P. D. and Ford, W. and Hoffmann, M. and Shallcross, D. E. (2012) The effect of the novel HO_2 + NO → HNO_3 reaction channel at South Pole, Antarctica. Antarctic Science, 24 (4). pp. 417-425. ISSN 0954-1020.

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It is well established that the reaction of HO_2 with NO plays a central role in atmospheric chemistry, by way of OH/HO_2 recycling and reduction of ozone depletion by HO_x cycles in the stratosphere and through ozone production in the troposphere. Utilizing a photochemical box model, we investigate the impact of the recently observed HNO_3 production channel (HO_2+NO → HNO_3) on NO_x (NO + NO_2), HO_x (OH + HO_2), HNO_3, and O_3 concentrations in the boundary layer at the South Pole, Antarctica. Our simulations exemplify decreases in peak O_3, NO, NO_2, and OH and an increase in HNO_3. Also, mean OH is in better agreement with observations, while worsening the agreement with O_3, HO_2, and HNO_3 concentrations observed at the South Pole. The reduced concentrations of NO_x are consistent with expected decreases in atmospheric NO_x lifetime as a result of increased sequestration of NO_x into HNO_3. Although we show that the inclusion of the novel HNO_3 production channel brings better agreement of OH with field measurements, the modelled ozone and HNO_3 are worsened, and the changes in NO_x lifetime imply that snowpack NO_x emissions and snowpack nitrate recycling must be re-evaluated.

Item Type:Article
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Hoffmann, M.0000-0001-6495-1946
Additional Information:© 2012 Antarctic Science Ltd. Received 6 April 2011, accepted 22 December 2011, first published online 6 March 2012. Paul Hamer was supported by an appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, administered by Oak Ridge Associated Universities through a contract with the National Aeronautics and Space Administration (NASA). The work described here was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contracts with NASA. The constructive comments of the reviewers are gratefully acknowledged.
Funding AgencyGrant Number
NASA Postdoctoral ProgramUNSPECIFIED
Oak Ridge Associated UniversitiesUNSPECIFIED
Subject Keywords:boundary layer, ice photochemistry, nitric acid, NOx, ozone, polar chemistry
Issue or Number:4
Record Number:CaltechAUTHORS:20120912-093539606
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Official Citation:C.S. Boxe, P.D. Hamer, W. Ford, M. Hoffmann and D.E. Shallcross (2012). The effect of the novel HO2 + NO → HNO3 reaction channel at South Pole, Antarctica. Antarctic Science, 24 , pp 417-425 doi:10.1017/S0954102012000144
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34018
Deposited By: Ruth Sustaita
Deposited On:12 Sep 2012 17:03
Last Modified:03 Mar 2020 13:01

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