Atmospheric test of the J(BrONO2)/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss
We report on time-dependent O3, NO2 and BrO profiles measured by limb observations of scattered skylight in the stratosphere over Kiruna (67.9° N, 22.1° E) on 7 and 8 September 2009 during the autumn circulation turn-over. The observations are complemented by simultaneous direct solar occultation me...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00045517 2023-05-15T17:04:21+02:00 Atmospheric test of the J(BrONO2)/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss Kreycy, S. Camy-Peyret, C. Chipperfield, M. P. Dorf, M. Feng, W. Hossaini, R. Kritten, L. Werner, B. Pfeilsticker, K. 2013-07 electronic https://doi.org/10.5194/acp-13-6263-2013 https://noa.gwlb.de/receive/cop_mods_00045517 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045137/acp-13-6263-2013.pdf https://acp.copernicus.org/articles/13/6263/2013/acp-13-6263-2013.pdf eng eng Copernicus Publications Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-13-6263-2013 https://noa.gwlb.de/receive/cop_mods_00045517 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045137/acp-13-6263-2013.pdf https://acp.copernicus.org/articles/13/6263/2013/acp-13-6263-2013.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2013 ftnonlinearchiv https://doi.org/10.5194/acp-13-6263-2013 2022-02-08T22:39:30Z We report on time-dependent O3, NO2 and BrO profiles measured by limb observations of scattered skylight in the stratosphere over Kiruna (67.9° N, 22.1° E) on 7 and 8 September 2009 during the autumn circulation turn-over. The observations are complemented by simultaneous direct solar occultation measurements around sunset and sunrise performed aboard the same stratospheric balloon payload. Supporting radiative transfer and photochemical modelling indicate that the measurements can be used to constrain the ratio J(BrONO2)/kBrO+NO2, for which at T = 220 ± 5 K an overall 1.7 (+0.4 −0.2) larger ratio is found than recommended by the most recent Jet Propulsion Laboratory (JPL) compilation (Sander et al., 2011). Sensitivity studies reveal the major reasons are likely to be (1) a larger BrONO2 absorption cross-section σBrONO2, primarily for wavelengths larger than 300 nm, and (2) a smaller kBrO+NO2 at 220 K than given by Sander et al. (2011). Other factors, e.g. the actinic flux and quantum yield for the dissociation of BrONO2, can be ruled out. The observations also have consequences for total inorganic stratospheric bromine (Bry) estimated from stratospheric BrO measurements at high NOx loadings, since the ratio J(BrONO2)/kBrO+NO2 largely determines the stratospheric BrO/Bry ratio during daylight. Using the revised J(BrONO2)/kBrO+NO2 ratio, total stratospheric Bry is likely to be 1.4 ppt smaller than previously estimated from BrO profile measurements at high NOx loadings. This would bring estimates of Bry inferred from organic source gas measurements (e.g. CH3Br, the halons, CH2Br2, CHBr3, etc.) into closer agreement with estimates based on BrO observations (inorganic method). The consequences for stratospheric ozone due to the revised J(BrONO2)/kBrO+NO2 ratio are small (maximum −0.8%), since at high NOx (for which most Bry assessments are made) the enhanced ozone loss by overestimating Bry is compensated for by the suppressed ozone loss due to the underestimation of BrO/Bry with a smaller J(BrONO2)/kBrO+NO2 ratio. Article in Journal/Newspaper Kiruna Niedersächsisches Online-Archiv NOA Kiruna Atmospheric Chemistry and Physics 13 13 6263 6274 |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Kreycy, S. Camy-Peyret, C. Chipperfield, M. P. Dorf, M. Feng, W. Hossaini, R. Kritten, L. Werner, B. Pfeilsticker, K. Atmospheric test of the J(BrONO2)/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss |
topic_facet |
article Verlagsveröffentlichung |
description |
We report on time-dependent O3, NO2 and BrO profiles measured by limb observations of scattered skylight in the stratosphere over Kiruna (67.9° N, 22.1° E) on 7 and 8 September 2009 during the autumn circulation turn-over. The observations are complemented by simultaneous direct solar occultation measurements around sunset and sunrise performed aboard the same stratospheric balloon payload. Supporting radiative transfer and photochemical modelling indicate that the measurements can be used to constrain the ratio J(BrONO2)/kBrO+NO2, for which at T = 220 ± 5 K an overall 1.7 (+0.4 −0.2) larger ratio is found than recommended by the most recent Jet Propulsion Laboratory (JPL) compilation (Sander et al., 2011). Sensitivity studies reveal the major reasons are likely to be (1) a larger BrONO2 absorption cross-section σBrONO2, primarily for wavelengths larger than 300 nm, and (2) a smaller kBrO+NO2 at 220 K than given by Sander et al. (2011). Other factors, e.g. the actinic flux and quantum yield for the dissociation of BrONO2, can be ruled out. The observations also have consequences for total inorganic stratospheric bromine (Bry) estimated from stratospheric BrO measurements at high NOx loadings, since the ratio J(BrONO2)/kBrO+NO2 largely determines the stratospheric BrO/Bry ratio during daylight. Using the revised J(BrONO2)/kBrO+NO2 ratio, total stratospheric Bry is likely to be 1.4 ppt smaller than previously estimated from BrO profile measurements at high NOx loadings. This would bring estimates of Bry inferred from organic source gas measurements (e.g. CH3Br, the halons, CH2Br2, CHBr3, etc.) into closer agreement with estimates based on BrO observations (inorganic method). The consequences for stratospheric ozone due to the revised J(BrONO2)/kBrO+NO2 ratio are small (maximum −0.8%), since at high NOx (for which most Bry assessments are made) the enhanced ozone loss by overestimating Bry is compensated for by the suppressed ozone loss due to the underestimation of BrO/Bry with a smaller J(BrONO2)/kBrO+NO2 ratio. |
format |
Article in Journal/Newspaper |
author |
Kreycy, S. Camy-Peyret, C. Chipperfield, M. P. Dorf, M. Feng, W. Hossaini, R. Kritten, L. Werner, B. Pfeilsticker, K. |
author_facet |
Kreycy, S. Camy-Peyret, C. Chipperfield, M. P. Dorf, M. Feng, W. Hossaini, R. Kritten, L. Werner, B. Pfeilsticker, K. |
author_sort |
Kreycy, S. |
title |
Atmospheric test of the J(BrONO2)/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss |
title_short |
Atmospheric test of the J(BrONO2)/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss |
title_full |
Atmospheric test of the J(BrONO2)/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss |
title_fullStr |
Atmospheric test of the J(BrONO2)/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss |
title_full_unstemmed |
Atmospheric test of the J(BrONO2)/kBrO+NO2 ratio: implications for total stratospheric Bry and bromine-mediated ozone loss |
title_sort |
atmospheric test of the j(brono2)/kbro+no2 ratio: implications for total stratospheric bry and bromine-mediated ozone loss |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/acp-13-6263-2013 https://noa.gwlb.de/receive/cop_mods_00045517 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045137/acp-13-6263-2013.pdf https://acp.copernicus.org/articles/13/6263/2013/acp-13-6263-2013.pdf |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_relation |
Atmospheric Chemistry and Physics -- http://www.atmos-chem-phys.net/volumes_and_issues.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2069847 -- 1680-7324 https://doi.org/10.5194/acp-13-6263-2013 https://noa.gwlb.de/receive/cop_mods_00045517 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045137/acp-13-6263-2013.pdf https://acp.copernicus.org/articles/13/6263/2013/acp-13-6263-2013.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-13-6263-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
13 |
container_start_page |
6263 |
op_container_end_page |
6274 |
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1766058436281237504 |