Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction
Bromine activation (the production of Br in an elevated oxidation state) promotes ozone destruction and mercury removal in the global troposphere and commonly occurs in both springtime polar boundary layers, often accompanied by nearly complete ozone destruction. The chemistry and budget of active b...
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2024
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Online Access: | https://doi.org/10.5194/acp-24-3421-2024 https://acp.copernicus.org/articles/24/3421/2024/ |
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ftcopernicus:oai:publications.copernicus.org:acp111193 2024-06-23T07:50:47+00:00 Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction Roberts, James M. Wang, Siyuan Veres, Patrick R. Neuman, J. Andrew Robinson, Michael A. Bourgeois, Ilann Peischl, Jeff Ryerson, Thomas B. Thompson, Chelsea R. Allen, Hannah M. Crounse, John D. Wennberg, Paul O. Hall, Samuel R. Ullmann, Kirk Meinardi, Simone Simpson, Isobel J. Blake, Donald 2024-03-20 application/pdf https://doi.org/10.5194/acp-24-3421-2024 https://acp.copernicus.org/articles/24/3421/2024/ eng eng doi:10.5194/acp-24-3421-2024 https://acp.copernicus.org/articles/24/3421/2024/ eISSN: 1680-7324 Text 2024 ftcopernicus https://doi.org/10.5194/acp-24-3421-2024 2024-06-13T01:23:00Z Bromine activation (the production of Br in an elevated oxidation state) promotes ozone destruction and mercury removal in the global troposphere and commonly occurs in both springtime polar boundary layers, often accompanied by nearly complete ozone destruction. The chemistry and budget of active bromine compounds (e.g., Br 2 , BrCl , BrO , HOBr ) reflect the cycling of Br and affect its environmental impact. Cyanogen bromide ( BrCN ) has recently been measured by iodide ion high-resolution time-of-flight mass spectrometry ( I − CIMS), and trifluoro methoxide ion time-of-flight mass spectrometry ( CF 3 O − CIMS) during the NASA Atmospheric Tomography Mission second, third, and fourth deployments (NASA ATom), and could be a previously unquantified participant in active Br chemistry. BrCN mixing ratios ranged from below the detection limit (1.5 pptv ) up to as high as 36 pptv (10 s average) and enhancements were almost exclusively confined to the polar boundary layers in the Arctic winter and in both polar regions during spring and fall. The coincidence of BrCN with active Br chemistry (often observable BrO , BrCl and O 3 loss) and high CHBr 3 / CH 2 Br 2 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="76pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="f9c2c577e80b58a3c7d171e37d26f4c3"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-24-3421-2024-ie00001.svg" width="76pt" height="14pt" src="acp-24-3421-2024-ie00001.png"/> </svg:svg> ratios imply that much of the observed BrCN is from atmospheric Br chemistry rather than a biogenic source. Likely BrCN formation pathways involve the heterogeneous reactions of active Br ( Br 2 , HOBr ) with reduced nitrogen compounds, for example hydrogen cyanide ( HCN / <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="5c3774ab0600a2f03e83f0e636ae5ed2"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" ... Text Arctic Copernicus Publications: E-Journals Arctic Atmospheric Chemistry and Physics 24 6 3421 3443 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
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English |
description |
Bromine activation (the production of Br in an elevated oxidation state) promotes ozone destruction and mercury removal in the global troposphere and commonly occurs in both springtime polar boundary layers, often accompanied by nearly complete ozone destruction. The chemistry and budget of active bromine compounds (e.g., Br 2 , BrCl , BrO , HOBr ) reflect the cycling of Br and affect its environmental impact. Cyanogen bromide ( BrCN ) has recently been measured by iodide ion high-resolution time-of-flight mass spectrometry ( I − CIMS), and trifluoro methoxide ion time-of-flight mass spectrometry ( CF 3 O − CIMS) during the NASA Atmospheric Tomography Mission second, third, and fourth deployments (NASA ATom), and could be a previously unquantified participant in active Br chemistry. BrCN mixing ratios ranged from below the detection limit (1.5 pptv ) up to as high as 36 pptv (10 s average) and enhancements were almost exclusively confined to the polar boundary layers in the Arctic winter and in both polar regions during spring and fall. The coincidence of BrCN with active Br chemistry (often observable BrO , BrCl and O 3 loss) and high CHBr 3 / CH 2 Br 2 <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="76pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="f9c2c577e80b58a3c7d171e37d26f4c3"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-24-3421-2024-ie00001.svg" width="76pt" height="14pt" src="acp-24-3421-2024-ie00001.png"/> </svg:svg> ratios imply that much of the observed BrCN is from atmospheric Br chemistry rather than a biogenic source. Likely BrCN formation pathways involve the heterogeneous reactions of active Br ( Br 2 , HOBr ) with reduced nitrogen compounds, for example hydrogen cyanide ( HCN / <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="8pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="5c3774ab0600a2f03e83f0e636ae5ed2"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" ... |
format |
Text |
author |
Roberts, James M. Wang, Siyuan Veres, Patrick R. Neuman, J. Andrew Robinson, Michael A. Bourgeois, Ilann Peischl, Jeff Ryerson, Thomas B. Thompson, Chelsea R. Allen, Hannah M. Crounse, John D. Wennberg, Paul O. Hall, Samuel R. Ullmann, Kirk Meinardi, Simone Simpson, Isobel J. Blake, Donald |
spellingShingle |
Roberts, James M. Wang, Siyuan Veres, Patrick R. Neuman, J. Andrew Robinson, Michael A. Bourgeois, Ilann Peischl, Jeff Ryerson, Thomas B. Thompson, Chelsea R. Allen, Hannah M. Crounse, John D. Wennberg, Paul O. Hall, Samuel R. Ullmann, Kirk Meinardi, Simone Simpson, Isobel J. Blake, Donald Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction |
author_facet |
Roberts, James M. Wang, Siyuan Veres, Patrick R. Neuman, J. Andrew Robinson, Michael A. Bourgeois, Ilann Peischl, Jeff Ryerson, Thomas B. Thompson, Chelsea R. Allen, Hannah M. Crounse, John D. Wennberg, Paul O. Hall, Samuel R. Ullmann, Kirk Meinardi, Simone Simpson, Isobel J. Blake, Donald |
author_sort |
Roberts, James M. |
title |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction |
title_short |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction |
title_full |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction |
title_fullStr |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction |
title_full_unstemmed |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O3 destruction |
title_sort |
observations of cyanogen bromide (brcn) in the global troposphere and their relation to polar surface o3 destruction |
publishDate |
2024 |
url |
https://doi.org/10.5194/acp-24-3421-2024 https://acp.copernicus.org/articles/24/3421/2024/ |
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Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
eISSN: 1680-7324 |
op_relation |
doi:10.5194/acp-24-3421-2024 https://acp.copernicus.org/articles/24/3421/2024/ |
op_doi |
https://doi.org/10.5194/acp-24-3421-2024 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
24 |
container_issue |
6 |
container_start_page |
3421 |
op_container_end_page |
3443 |
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1802641694664949760 |