Overview of the 2007 and 2008 campaigns conducted as part of the Greenland Summit Halogen-HOx Experiment (GSHOX)
From 10 May through 17 June 2007 and 6 June through 9 July 2008 intensive sampling campaigns at Summit, Greenland confirmed that active bromine chemistry is occurring in and above the snow pack at the highest part of the Greenland ice sheet (72°36´ N, 38°25´ W and 3.2 km above sea level). Direct mea...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00045796 2023-05-15T16:27:47+02:00 Overview of the 2007 and 2008 campaigns conducted as part of the Greenland Summit Halogen-HOx Experiment (GSHOX) Thomas, J. L. Dibb, J. E. Stutz, J. von Glasow, R. Brooks, S. Huey, L. G. Lefer, B. 2012-11 electronic https://doi.org/10.5194/acp-12-10833-2012 https://noa.gwlb.de/receive/cop_mods_00045796 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045416/acp-12-10833-2012.pdf https://acp.copernicus.org/articles/12/10833/2012/acp-12-10833-2012.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-12-10833-2012 https://noa.gwlb.de/receive/cop_mods_00045796 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045416/acp-12-10833-2012.pdf https://acp.copernicus.org/articles/12/10833/2012/acp-12-10833-2012.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2012 ftnonlinearchiv https://doi.org/10.5194/acp-12-10833-2012 2022-02-08T22:39:24Z From 10 May through 17 June 2007 and 6 June through 9 July 2008 intensive sampling campaigns at Summit, Greenland confirmed that active bromine chemistry is occurring in and above the snow pack at the highest part of the Greenland ice sheet (72°36´ N, 38°25´ W and 3.2 km above sea level). Direct measurements found BrO and soluble gas phase Br− mixing ratios in the low pptv range on many days (maxima < 10 pptv). Conversion of up to 200 pg m−3 of gaseous elemental mercury (GEM) to reactive gaseous mercury (RGM) and enhanced OH relative to HO2 plus RO2 confirm that active bromine chemistry is impacting chemical cycles even at such low abundances of reactive bromine species. However, it does not appear that Bry chemistry can fully account for observed perturbations to HOx partitioning, suggesting unknown additional chemical processes may be important in this unique environment, or that our understanding of coupled NOx-HOx-Bry chemistry above sunlit polar snow is incomplete. Rapid transport from the north Atlantic marine boundary layer occasionally caused enhanced BrO at Summit (just two such events observed during the 12 weeks of sampling over the two seasons). In general observed reactive bromine was linked to activation of bromide (Br−) in, and release of reactive bromine from, the snowpack. A coupled snow-atmosphere model simulated observed NO and BrO at Summit during a three day interval when winds were weak. The source of Br− in surface and near surface snow at Summit is not entirely clear, but concentrations were observed to increase when stronger vertical mixing brought free tropospheric air to the surface. Reactive Bry mixing ratios above the snow often increased in the day or two following increases in snow concentration, but this response was not consistent. On seasonal time scales concentrations of Br− in snow and reactive bromine in the air were directly related. Article in Journal/Newspaper Greenland Ice Sheet North Atlantic Niedersächsisches Online-Archiv NOA Greenland Atmospheric Chemistry and Physics 12 22 10833 10839 |
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Niedersächsisches Online-Archiv NOA |
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article Verlagsveröffentlichung Thomas, J. L. Dibb, J. E. Stutz, J. von Glasow, R. Brooks, S. Huey, L. G. Lefer, B. Overview of the 2007 and 2008 campaigns conducted as part of the Greenland Summit Halogen-HOx Experiment (GSHOX) |
topic_facet |
article Verlagsveröffentlichung |
description |
From 10 May through 17 June 2007 and 6 June through 9 July 2008 intensive sampling campaigns at Summit, Greenland confirmed that active bromine chemistry is occurring in and above the snow pack at the highest part of the Greenland ice sheet (72°36´ N, 38°25´ W and 3.2 km above sea level). Direct measurements found BrO and soluble gas phase Br− mixing ratios in the low pptv range on many days (maxima < 10 pptv). Conversion of up to 200 pg m−3 of gaseous elemental mercury (GEM) to reactive gaseous mercury (RGM) and enhanced OH relative to HO2 plus RO2 confirm that active bromine chemistry is impacting chemical cycles even at such low abundances of reactive bromine species. However, it does not appear that Bry chemistry can fully account for observed perturbations to HOx partitioning, suggesting unknown additional chemical processes may be important in this unique environment, or that our understanding of coupled NOx-HOx-Bry chemistry above sunlit polar snow is incomplete. Rapid transport from the north Atlantic marine boundary layer occasionally caused enhanced BrO at Summit (just two such events observed during the 12 weeks of sampling over the two seasons). In general observed reactive bromine was linked to activation of bromide (Br−) in, and release of reactive bromine from, the snowpack. A coupled snow-atmosphere model simulated observed NO and BrO at Summit during a three day interval when winds were weak. The source of Br− in surface and near surface snow at Summit is not entirely clear, but concentrations were observed to increase when stronger vertical mixing brought free tropospheric air to the surface. Reactive Bry mixing ratios above the snow often increased in the day or two following increases in snow concentration, but this response was not consistent. On seasonal time scales concentrations of Br− in snow and reactive bromine in the air were directly related. |
format |
Article in Journal/Newspaper |
author |
Thomas, J. L. Dibb, J. E. Stutz, J. von Glasow, R. Brooks, S. Huey, L. G. Lefer, B. |
author_facet |
Thomas, J. L. Dibb, J. E. Stutz, J. von Glasow, R. Brooks, S. Huey, L. G. Lefer, B. |
author_sort |
Thomas, J. L. |
title |
Overview of the 2007 and 2008 campaigns conducted as part of the Greenland Summit Halogen-HOx Experiment (GSHOX) |
title_short |
Overview of the 2007 and 2008 campaigns conducted as part of the Greenland Summit Halogen-HOx Experiment (GSHOX) |
title_full |
Overview of the 2007 and 2008 campaigns conducted as part of the Greenland Summit Halogen-HOx Experiment (GSHOX) |
title_fullStr |
Overview of the 2007 and 2008 campaigns conducted as part of the Greenland Summit Halogen-HOx Experiment (GSHOX) |
title_full_unstemmed |
Overview of the 2007 and 2008 campaigns conducted as part of the Greenland Summit Halogen-HOx Experiment (GSHOX) |
title_sort |
overview of the 2007 and 2008 campaigns conducted as part of the greenland summit halogen-hox experiment (gshox) |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/acp-12-10833-2012 https://noa.gwlb.de/receive/cop_mods_00045796 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045416/acp-12-10833-2012.pdf https://acp.copernicus.org/articles/12/10833/2012/acp-12-10833-2012.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet North Atlantic |
genre_facet |
Greenland Ice Sheet North Atlantic |
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-12-10833-2012 https://noa.gwlb.de/receive/cop_mods_00045796 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00045416/acp-12-10833-2012.pdf https://acp.copernicus.org/articles/12/10833/2012/acp-12-10833-2012.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/acp-12-10833-2012 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
12 |
container_issue |
22 |
container_start_page |
10833 |
op_container_end_page |
10839 |
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1766017305591939072 |