Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008
The Greenland Summit Halogen-HOx (GSHOX) Campaign was performed in spring 2007 and summer 2008 to investigate the impact of halogens on HOx (= OH + HO2) cycling above the Greenland Ice Sheet. Chemical species including hydroxyl and peroxy radicals (OH and HO2 + RO2), ozone (O3), nitrogen oxide (NO),...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00046431 2023-05-15T16:27:36+02:00 Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 Liao, J. Huey, L. G. Tanner, D. J. Brough, N. Brooks, S. Dibb, J. E. Stutz, J. Thomas, J. L. Lefer, B. Haman, C. Gorham, K. 2011-08 electronic https://doi.org/10.5194/acp-11-8577-2011 https://noa.gwlb.de/receive/cop_mods_00046431 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046051/acp-11-8577-2011.pdf https://acp.copernicus.org/articles/11/8577/2011/acp-11-8577-2011.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-11-8577-2011 https://noa.gwlb.de/receive/cop_mods_00046431 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046051/acp-11-8577-2011.pdf https://acp.copernicus.org/articles/11/8577/2011/acp-11-8577-2011.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2011 ftnonlinearchiv https://doi.org/10.5194/acp-11-8577-2011 2022-02-08T22:39:03Z The Greenland Summit Halogen-HOx (GSHOX) Campaign was performed in spring 2007 and summer 2008 to investigate the impact of halogens on HOx (= OH + HO2) cycling above the Greenland Ice Sheet. Chemical species including hydroxyl and peroxy radicals (OH and HO2 + RO2), ozone (O3), nitrogen oxide (NO), nitric acid (HNO3), nitrous acid (HONO), reactive gaseous mercury (RGM), and bromine oxide (BrO) were measured during the campaign. The median midday values of HO2 + RO2 and OH concentrations observed by chemical ionization mass spectrometry (CIMS) were 2.7 × 108 molec cm−3 and 3.0 × 106 molec cm−3 in spring 2007, and 4.2 × 108 molec cm−3 and 4.1 × 106 molec cm−3 in summer 2008. A basic photochemical 0-D box model highly constrained by observations of H2O, O3, CO, CH4, NO, and J values predicted HO2 + RO2 (R = 0.90, slope = 0.87 in 2007; R = 0.79, slope = 0.96 in 2008) reasonably well and under predicted OH (R = 0.83, slope = 0.72 in 2007; R = 0.76, slope = 0.54 in 2008). Constraining the model to HONO observations did not significantly improve the ratio of OH to HO2 + RO2 and the correlation between predictions and observations. Including bromine chemistry in the model constrained by observations of BrO improved the correlation between observed and predicted HO2 + RO2 and OH, and brought the average hourly OH and HO2 + RO2 predictions closer to the observations. These model comparisons confirmed our understanding of the dominant HOx sources and sinks in this environment and indicated that BrO impacted the OH levels at Summit. Although, significant discrepancies between observed and predicted OH could not be explained by the measured BrO. Finally, observations of enhanced RGM were found to be coincident with under prediction of OH. Article in Journal/Newspaper Greenland Ice Sheet Niedersächsisches Online-Archiv NOA Greenland Atmospheric Chemistry and Physics 11 16 8577 8591 |
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article Verlagsveröffentlichung Liao, J. Huey, L. G. Tanner, D. J. Brough, N. Brooks, S. Dibb, J. E. Stutz, J. Thomas, J. L. Lefer, B. Haman, C. Gorham, K. Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
topic_facet |
article Verlagsveröffentlichung |
description |
The Greenland Summit Halogen-HOx (GSHOX) Campaign was performed in spring 2007 and summer 2008 to investigate the impact of halogens on HOx (= OH + HO2) cycling above the Greenland Ice Sheet. Chemical species including hydroxyl and peroxy radicals (OH and HO2 + RO2), ozone (O3), nitrogen oxide (NO), nitric acid (HNO3), nitrous acid (HONO), reactive gaseous mercury (RGM), and bromine oxide (BrO) were measured during the campaign. The median midday values of HO2 + RO2 and OH concentrations observed by chemical ionization mass spectrometry (CIMS) were 2.7 × 108 molec cm−3 and 3.0 × 106 molec cm−3 in spring 2007, and 4.2 × 108 molec cm−3 and 4.1 × 106 molec cm−3 in summer 2008. A basic photochemical 0-D box model highly constrained by observations of H2O, O3, CO, CH4, NO, and J values predicted HO2 + RO2 (R = 0.90, slope = 0.87 in 2007; R = 0.79, slope = 0.96 in 2008) reasonably well and under predicted OH (R = 0.83, slope = 0.72 in 2007; R = 0.76, slope = 0.54 in 2008). Constraining the model to HONO observations did not significantly improve the ratio of OH to HO2 + RO2 and the correlation between predictions and observations. Including bromine chemistry in the model constrained by observations of BrO improved the correlation between observed and predicted HO2 + RO2 and OH, and brought the average hourly OH and HO2 + RO2 predictions closer to the observations. These model comparisons confirmed our understanding of the dominant HOx sources and sinks in this environment and indicated that BrO impacted the OH levels at Summit. Although, significant discrepancies between observed and predicted OH could not be explained by the measured BrO. Finally, observations of enhanced RGM were found to be coincident with under prediction of OH. |
format |
Article in Journal/Newspaper |
author |
Liao, J. Huey, L. G. Tanner, D. J. Brough, N. Brooks, S. Dibb, J. E. Stutz, J. Thomas, J. L. Lefer, B. Haman, C. Gorham, K. |
author_facet |
Liao, J. Huey, L. G. Tanner, D. J. Brough, N. Brooks, S. Dibb, J. E. Stutz, J. Thomas, J. L. Lefer, B. Haman, C. Gorham, K. |
author_sort |
Liao, J. |
title |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_short |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_full |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_fullStr |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_full_unstemmed |
Observations of hydroxyl and peroxy radicals and the impact of BrO at Summit, Greenland in 2007 and 2008 |
title_sort |
observations of hydroxyl and peroxy radicals and the impact of bro at summit, greenland in 2007 and 2008 |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/acp-11-8577-2011 https://noa.gwlb.de/receive/cop_mods_00046431 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046051/acp-11-8577-2011.pdf https://acp.copernicus.org/articles/11/8577/2011/acp-11-8577-2011.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
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-11-8577-2011 https://noa.gwlb.de/receive/cop_mods_00046431 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00046051/acp-11-8577-2011.pdf https://acp.copernicus.org/articles/11/8577/2011/acp-11-8577-2011.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-11-8577-2011 |
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Atmospheric Chemistry and Physics |
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11 |
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16 |
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8577 |
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8591 |
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1766016993060716544 |