Methyl bromide in preindustrial air: Measurements from an Antarctic ice core
This paper presents the first ice core measurements of methyl bromide (CH3Br). Samples from a shallow Antarctic ice core (Siple Dome, West Antarctica), ranging in mean gas dates from 1671 to 1942, had a mean CH3Br mixing ratio of 5.8 ppt. These results extend the existing historical record derived f...
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ftcdlib:qt2fq8x031 2023-05-15T14:01:33+02:00 Methyl bromide in preindustrial air: Measurements from an Antarctic ice core Saltzman, Eric S Aydin, M. De Bruyn, W. J. King, D. B. Yvon-Lewis, S. A. 2004-01-01 application/pdf http://www.escholarship.org/uc/item/2fq8x031 english eng eScholarship, University of California qt2fq8x031 http://www.escholarship.org/uc/item/2fq8x031 Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Saltzman, Eric S; Aydin, M.; De Bruyn, W. J.; King, D. B.; & Yvon-Lewis, S. A.(2004). Methyl bromide in preindustrial air: Measurements from an Antarctic ice core. Journal of Geophysical Research, 109(D5). doi:10.1029/2003JD004157. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/2fq8x031 Physical Sciences and Mathematics concentration (composition) ice core measurement method methyl bromide source-sink dynamics article 2004 ftcdlib https://doi.org/10.1029/2003JD004157 2016-04-02T18:29:34Z This paper presents the first ice core measurements of methyl bromide (CH3Br). Samples from a shallow Antarctic ice core (Siple Dome, West Antarctica), ranging in mean gas dates from 1671 to 1942, had a mean CH3Br mixing ratio of 5.8 ppt. These results extend the existing historical record derived from air and Antarctic firn air to about 350 years before present. Model simulations illustrate that the ice core results are consistent with estimates of the impact of anthropogenic activity (fumigation, combustion, and biomass burning) on the atmospheric CH3Br burden, given the large current uncertainties in the modern atmospheric CH3Br budget. A preindustrial scenario assuming no fumigation, no combustion, and a 75% reduction in biomass-burning sources yields a Southern Hemisphere mean mixing ratio of 5.8 ppt, in good agreement with the ice core results. There is a significant imbalance between the known CH3Br sources and sinks in the modern atmospheric CH3Br budget. The ice core data do not sufficiently constrain the model to determine how much of the “unknown source” was present in the preindustrial budget. The results do indicate that most of the southern hemispheric component of this “unknown source” is not anthropogenic. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core West Antarctica University of California: eScholarship Antarctic Siple ENVELOPE(-83.917,-83.917,-75.917,-75.917) Siple Dome ENVELOPE(-148.833,-148.833,-81.667,-81.667) West Antarctica Journal of Geophysical Research 109 D5 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics concentration (composition) ice core measurement method methyl bromide source-sink dynamics |
spellingShingle |
Physical Sciences and Mathematics concentration (composition) ice core measurement method methyl bromide source-sink dynamics Saltzman, Eric S Aydin, M. De Bruyn, W. J. King, D. B. Yvon-Lewis, S. A. Methyl bromide in preindustrial air: Measurements from an Antarctic ice core |
topic_facet |
Physical Sciences and Mathematics concentration (composition) ice core measurement method methyl bromide source-sink dynamics |
description |
This paper presents the first ice core measurements of methyl bromide (CH3Br). Samples from a shallow Antarctic ice core (Siple Dome, West Antarctica), ranging in mean gas dates from 1671 to 1942, had a mean CH3Br mixing ratio of 5.8 ppt. These results extend the existing historical record derived from air and Antarctic firn air to about 350 years before present. Model simulations illustrate that the ice core results are consistent with estimates of the impact of anthropogenic activity (fumigation, combustion, and biomass burning) on the atmospheric CH3Br burden, given the large current uncertainties in the modern atmospheric CH3Br budget. A preindustrial scenario assuming no fumigation, no combustion, and a 75% reduction in biomass-burning sources yields a Southern Hemisphere mean mixing ratio of 5.8 ppt, in good agreement with the ice core results. There is a significant imbalance between the known CH3Br sources and sinks in the modern atmospheric CH3Br budget. The ice core data do not sufficiently constrain the model to determine how much of the “unknown source” was present in the preindustrial budget. The results do indicate that most of the southern hemispheric component of this “unknown source” is not anthropogenic. |
format |
Article in Journal/Newspaper |
author |
Saltzman, Eric S Aydin, M. De Bruyn, W. J. King, D. B. Yvon-Lewis, S. A. |
author_facet |
Saltzman, Eric S Aydin, M. De Bruyn, W. J. King, D. B. Yvon-Lewis, S. A. |
author_sort |
Saltzman, Eric S |
title |
Methyl bromide in preindustrial air: Measurements from an Antarctic ice core |
title_short |
Methyl bromide in preindustrial air: Measurements from an Antarctic ice core |
title_full |
Methyl bromide in preindustrial air: Measurements from an Antarctic ice core |
title_fullStr |
Methyl bromide in preindustrial air: Measurements from an Antarctic ice core |
title_full_unstemmed |
Methyl bromide in preindustrial air: Measurements from an Antarctic ice core |
title_sort |
methyl bromide in preindustrial air: measurements from an antarctic ice core |
publisher |
eScholarship, University of California |
publishDate |
2004 |
url |
http://www.escholarship.org/uc/item/2fq8x031 |
long_lat |
ENVELOPE(-83.917,-83.917,-75.917,-75.917) ENVELOPE(-148.833,-148.833,-81.667,-81.667) |
geographic |
Antarctic Siple Siple Dome West Antarctica |
geographic_facet |
Antarctic Siple Siple Dome West Antarctica |
genre |
Antarc* Antarctic Antarctica ice core West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica ice core West Antarctica |
op_source |
Saltzman, Eric S; Aydin, M.; De Bruyn, W. J.; King, D. B.; & Yvon-Lewis, S. A.(2004). Methyl bromide in preindustrial air: Measurements from an Antarctic ice core. Journal of Geophysical Research, 109(D5). doi:10.1029/2003JD004157. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/2fq8x031 |
op_relation |
qt2fq8x031 http://www.escholarship.org/uc/item/2fq8x031 |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2003JD004157 |
container_title |
Journal of Geophysical Research |
container_volume |
109 |
container_issue |
D5 |
_version_ |
1766271389123215360 |