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Establishing the Dependence of [HO_2]/[OH] on Temperature, Halogen Loading, O_3, and NO_x Based on in Situ Measurements from the NASA ER-2

Lanzendorf, E. J. and Hanisco, T. F. and Wennberg, P. O. and Cohen, R. C. and Stimpfle, R. M. and Anderson, J. G. and Gao, R. S. and Margitan, J. J. and Bui, T. P. (2001) Establishing the Dependence of [HO_2]/[OH] on Temperature, Halogen Loading, O_3, and NO_x Based on in Situ Measurements from the NASA ER-2. Journal of Physical Chemistry A, 105 (9). pp. 1535-1542. ISSN 1089-5639. https://resolver.caltech.edu/CaltechAUTHORS:20140625-094855154

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Abstract

In situ observations of OH and HO_2 from the Airborne Southern Hemisphere Ozone Experiment/Measurements for Assessing the Effects of Stratospheric Aircraft (ASHOE/MAESA), Stratospheric TRacers of Atmospheric Transport (STRAT), and Polar Ozone Loss in the Arctic Region in Summer (POLARIS) NASA ER-2 field campaigns are used to examine the partitioning of HO_x in the lower stratosphere (tropopause to ~21 km) and upper troposphere (~10 km to tropopause). These measurements span a latitude range from 70°S to 90°N and a variety of atmospheric conditions as a result of seasonal changes and altitude. The response of the observed [HO_2]/[OH] to changes in temperature, [O_3], [CO], [NO], [ClO], and [BrO] is investigated. The measured ratio is accurately described (~±10%) by a steady-state model constrained by the measured mixing ratios of O_3, CO, NO, ClO, and BrO, where the model is valid for conditions of HO_x cycling much faster than HO_x production and loss. The concentration of HO_2 depends on [OH], which, to first order, has been observed to be a simple function of the solar zenith angle in the lower stratosphere.^1 The partitioning between OH and HO_2 is controlled by the local chemistry between the HO_x radicals and O_3, CO, NO, ClO, and BrO. The response of [HO_x] to changes in [NO_x] and [O_3] is demonstrated. Further observations are necessary to illustrate the response of HOx to changes in halogen concentrations. A quantitative understanding of [HO_2]/[OH] is important, since many of the reactions that control this ratio are directly involved in catalytic removal of O_3 in the lower stratosphere and production of O_3 in the upper troposphere.


Item Type:Article
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URLURL TypeDescription
http://pubs.acs.org/doi/abs/10.1021/jp002384lPublisherArticle
http://dx.doi.org/10.1021/jp002384lDOIArticle
ORCID:
AuthorORCID
Wennberg, P. O.0000-0002-6126-3854
Alternate Title:Establishing the Dependence of [HO2]/[OH] on Temperature, Halogen Loading, O3, and NOx Based on in Situ Measurements from the NASA ER-2
Additional Information:© 2001 American Chemical Society. Received: July 3, 2000; in Final Form: October 18, 2000. We thank the pilots and crew of the NASA ER-2. Thank you to C. R. Webster, R. D. May, and R. Herman for use of the ALIAS-CO measurements in this analysis and D. W. Fahey for use of the NO measurements. The ASHOE/MAESA, STRAT, and POLARIS ER-2 programs were supported by NASA through the Upper Atmosphere Research Program, the Atmospheric Effects of Aviation Project, and the Atmospheric Chemistry Modeling and Analysis Program.
Funders:
Funding AgencyGrant Number
NASAUNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20140625-094855154
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20140625-094855154
Official Citation:Establishing the Dependence of [HO2]/[OH] on Temperature, Halogen Loading, O3, and NOx Based on in Situ Measurements from the NASA ER-2 E. J. Lanzendorf, T. F. Hanisco, P. O. Wennberg, R. C. Cohen, R. M. Stimpfle, J. G. Anderson, R. S. Gao, J. J. Margitan, and T. P. Bui The Journal of Physical Chemistry A 2001 105 (9), 1535-1542
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46498
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:25 Jun 2014 17:42
Last Modified:03 Oct 2019 06:44

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