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
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 f...
Published in: | The Journal of Physical Chemistry A |
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American Chemical Society
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ftcaltechauth:oai:authors.library.caltech.edu:46498 2023-05-15T15:13:52+02:00 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. Hanisco, T. F. Wennberg, P. O. Cohen, R. C. Stimpfle, R. M. Anderson, J. G. Gao, R. S. Margitan, J. J. Bui, T. P. 2001-03-08 https://authors.library.caltech.edu/46498/ https://resolver.caltech.edu/CaltechAUTHORS:20140625-094855154 unknown American Chemical Society 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. doi:10.1021/jp002384l. https://resolver.caltech.edu/CaltechAUTHORS:20140625-094855154 <https://resolver.caltech.edu/CaltechAUTHORS:20140625-094855154> Article PeerReviewed 2001 ftcaltechauth https://doi.org/10.1021/jp002384l 2021-11-11T18:58:17Z 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. Article in Journal/Newspaper Arctic Caltech Authors (California Institute of Technology) Arctic The Journal of Physical Chemistry A 105 9 1535 1542 |
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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. |
format |
Article in Journal/Newspaper |
author |
Lanzendorf, E. J. Hanisco, T. F. Wennberg, P. O. Cohen, R. C. Stimpfle, R. M. Anderson, J. G. Gao, R. S. Margitan, J. J. Bui, T. P. |
spellingShingle |
Lanzendorf, E. J. Hanisco, T. F. Wennberg, P. O. Cohen, R. C. Stimpfle, R. M. Anderson, J. G. Gao, R. S. Margitan, J. J. Bui, T. P. 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 |
author_facet |
Lanzendorf, E. J. Hanisco, T. F. Wennberg, P. O. Cohen, R. C. Stimpfle, R. M. Anderson, J. G. Gao, R. S. Margitan, J. J. Bui, T. P. |
author_sort |
Lanzendorf, E. J. |
title |
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 |
title_short |
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 |
title_full |
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 |
title_fullStr |
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 |
title_full_unstemmed |
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 |
title_sort |
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 |
publisher |
American Chemical Society |
publishDate |
2001 |
url |
https://authors.library.caltech.edu/46498/ https://resolver.caltech.edu/CaltechAUTHORS:20140625-094855154 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
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. doi:10.1021/jp002384l. https://resolver.caltech.edu/CaltechAUTHORS:20140625-094855154 <https://resolver.caltech.edu/CaltechAUTHORS:20140625-094855154> |
op_doi |
https://doi.org/10.1021/jp002384l |
container_title |
The Journal of Physical Chemistry A |
container_volume |
105 |
container_issue |
9 |
container_start_page |
1535 |
op_container_end_page |
1542 |
_version_ |
1766344390691782656 |