Methyl bromide, other brominated methanes, and methyl iodide in polar firn air
We report measurements of brominated, bromochlorinated, and iodinated methanes in air extracted from deep firn at three polar locations (two Antarctic and one Arctic). Using a firn diffusion model, we are able to reconstruct a consistent temporal trend for methyl bromide from the two Antarctic sites...
Published in: | Journal of Geophysical Research: Atmospheres |
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American Geophysical Union
2001
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Online Access: | http://nora.nerc.ac.uk/id/eprint/20305/ https://doi.org/10.1029/2000JD900511 |
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ftnerc:oai:nora.nerc.ac.uk:20305 2023-05-15T13:45:12+02:00 Methyl bromide, other brominated methanes, and methyl iodide in polar firn air Sturges, W.T. McIntyre, H.P. Penkett, S.A. Chappellaz, J. Barnola, J.-M. Mulvaney, R. Atlas, E. Stroud, V. 2001 http://nora.nerc.ac.uk/id/eprint/20305/ https://doi.org/10.1029/2000JD900511 unknown American Geophysical Union Sturges, W.T.; McIntyre, H.P.; Penkett, S.A.; Chappellaz, J.; Barnola, J.-M.; Mulvaney, R. orcid:0000-0002-5372-8148 Atlas, E.; Stroud, V. 2001 Methyl bromide, other brominated methanes, and methyl iodide in polar firn air. Journal of Geophysical Research, 106 (D2). 1595-1606. https://doi.org/10.1029/2000JD900511 <https://doi.org/10.1029/2000JD900511> Atmospheric Sciences Chemistry Publication - Article PeerReviewed 2001 ftnerc https://doi.org/10.1029/2000JD900511 2023-02-04T19:32:47Z We report measurements of brominated, bromochlorinated, and iodinated methanes in air extracted from deep firn at three polar locations (two Antarctic and one Arctic). Using a firn diffusion model, we are able to reconstruct a consistent temporal trend for methyl bromide from the two Antarctic sites. This indicates a steady increase by about 2 ppt from the midtwentieth century to 8 ppt today. The Arctic firn, however, contained extremely high levels of methyl bromide as well as numerous other organic gases, which are evidently produced in situ. The other brominated species (dibromomethane, bromochloromethane, bromodichloromethane, dibromochloromethane, and bromoform) showed little or no long-term trend in Antarctic firn and therefore are evidently of entirely natural origin in the Southern Hemisphere. A clear seasonal trend was observed in the upper firn for the shortest-lived halocarbons (notably bromoform and methyl iodide). The same species were present at lower abundance at the higher altitude and more inland Antarctic site, possibly due to their origin from more distant oceanic sources. Article in Journal/Newspaper Antarc* Antarctic Arctic Natural Environment Research Council: NERC Open Research Archive Arctic Antarctic Journal of Geophysical Research: Atmospheres 106 D2 1595 1606 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Atmospheric Sciences Chemistry |
spellingShingle |
Atmospheric Sciences Chemistry Sturges, W.T. McIntyre, H.P. Penkett, S.A. Chappellaz, J. Barnola, J.-M. Mulvaney, R. Atlas, E. Stroud, V. Methyl bromide, other brominated methanes, and methyl iodide in polar firn air |
topic_facet |
Atmospheric Sciences Chemistry |
description |
We report measurements of brominated, bromochlorinated, and iodinated methanes in air extracted from deep firn at three polar locations (two Antarctic and one Arctic). Using a firn diffusion model, we are able to reconstruct a consistent temporal trend for methyl bromide from the two Antarctic sites. This indicates a steady increase by about 2 ppt from the midtwentieth century to 8 ppt today. The Arctic firn, however, contained extremely high levels of methyl bromide as well as numerous other organic gases, which are evidently produced in situ. The other brominated species (dibromomethane, bromochloromethane, bromodichloromethane, dibromochloromethane, and bromoform) showed little or no long-term trend in Antarctic firn and therefore are evidently of entirely natural origin in the Southern Hemisphere. A clear seasonal trend was observed in the upper firn for the shortest-lived halocarbons (notably bromoform and methyl iodide). The same species were present at lower abundance at the higher altitude and more inland Antarctic site, possibly due to their origin from more distant oceanic sources. |
format |
Article in Journal/Newspaper |
author |
Sturges, W.T. McIntyre, H.P. Penkett, S.A. Chappellaz, J. Barnola, J.-M. Mulvaney, R. Atlas, E. Stroud, V. |
author_facet |
Sturges, W.T. McIntyre, H.P. Penkett, S.A. Chappellaz, J. Barnola, J.-M. Mulvaney, R. Atlas, E. Stroud, V. |
author_sort |
Sturges, W.T. |
title |
Methyl bromide, other brominated methanes, and methyl iodide in polar firn air |
title_short |
Methyl bromide, other brominated methanes, and methyl iodide in polar firn air |
title_full |
Methyl bromide, other brominated methanes, and methyl iodide in polar firn air |
title_fullStr |
Methyl bromide, other brominated methanes, and methyl iodide in polar firn air |
title_full_unstemmed |
Methyl bromide, other brominated methanes, and methyl iodide in polar firn air |
title_sort |
methyl bromide, other brominated methanes, and methyl iodide in polar firn air |
publisher |
American Geophysical Union |
publishDate |
2001 |
url |
http://nora.nerc.ac.uk/id/eprint/20305/ https://doi.org/10.1029/2000JD900511 |
geographic |
Arctic Antarctic |
geographic_facet |
Arctic Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_relation |
Sturges, W.T.; McIntyre, H.P.; Penkett, S.A.; Chappellaz, J.; Barnola, J.-M.; Mulvaney, R. orcid:0000-0002-5372-8148 Atlas, E.; Stroud, V. 2001 Methyl bromide, other brominated methanes, and methyl iodide in polar firn air. Journal of Geophysical Research, 106 (D2). 1595-1606. https://doi.org/10.1029/2000JD900511 <https://doi.org/10.1029/2000JD900511> |
op_doi |
https://doi.org/10.1029/2000JD900511 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
106 |
container_issue |
D2 |
container_start_page |
1595 |
op_container_end_page |
1606 |
_version_ |
1766217045083422720 |