Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O 3 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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ftdoajarticles:oai:doaj.org/article:1a37751b59af4b93b1fa5bcd304102b7 2024-09-09T19:28:08+00:00 Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O 3 destruction J. M. Roberts S. Wang P. R. Veres J. A. Neuman M. A. Robinson I. Bourgeois J. Peischl T. B. Ryerson C. R. Thompson H. M. Allen J. D. Crounse P. O. Wennberg S. R. Hall K. Ullmann S. Meinardi I. J. Simpson D. Blake 2024-03-01T00:00:00Z https://doi.org/10.5194/acp-24-3421-2024 https://doaj.org/article/1a37751b59af4b93b1fa5bcd304102b7 EN eng Copernicus Publications https://acp.copernicus.org/articles/24/3421/2024/acp-24-3421-2024.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-24-3421-2024 1680-7316 1680-7324 https://doaj.org/article/1a37751b59af4b93b1fa5bcd304102b7 Atmospheric Chemistry and Physics, Vol 24, Pp 3421-3443 (2024) Physics QC1-999 Chemistry QD1-999 article 2024 ftdoajarticles https://doi.org/10.5194/acp-24-3421-2024 2024-08-05T17:49:47Z 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" ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 24 6 3421 3443 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 J. M. Roberts S. Wang P. R. Veres J. A. Neuman M. A. Robinson I. Bourgeois J. Peischl T. B. Ryerson C. R. Thompson H. M. Allen J. D. Crounse P. O. Wennberg S. R. Hall K. Ullmann S. Meinardi I. J. Simpson D. Blake Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O 3 destruction |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
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 |
Article in Journal/Newspaper |
author |
J. M. Roberts S. Wang P. R. Veres J. A. Neuman M. A. Robinson I. Bourgeois J. Peischl T. B. Ryerson C. R. Thompson H. M. Allen J. D. Crounse P. O. Wennberg S. R. Hall K. Ullmann S. Meinardi I. J. Simpson D. Blake |
author_facet |
J. M. Roberts S. Wang P. R. Veres J. A. Neuman M. A. Robinson I. Bourgeois J. Peischl T. B. Ryerson C. R. Thompson H. M. Allen J. D. Crounse P. O. Wennberg S. R. Hall K. Ullmann S. Meinardi I. J. Simpson D. Blake |
author_sort |
J. M. Roberts |
title |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O 3 destruction |
title_short |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O 3 destruction |
title_full |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O 3 destruction |
title_fullStr |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O 3 destruction |
title_full_unstemmed |
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O 3 destruction |
title_sort |
observations of cyanogen bromide (brcn) in the global troposphere and their relation to polar surface o 3 destruction |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/acp-24-3421-2024 https://doaj.org/article/1a37751b59af4b93b1fa5bcd304102b7 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 24, Pp 3421-3443 (2024) |
op_relation |
https://acp.copernicus.org/articles/24/3421/2024/acp-24-3421-2024.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-24-3421-2024 1680-7316 1680-7324 https://doaj.org/article/1a37751b59af4b93b1fa5bcd304102b7 |
op_doi |
https://doi.org/10.5194/acp-24-3421-2024 |
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Atmospheric Chemistry and Physics |
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24 |
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6 |
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3421 |
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3443 |
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