Journal article
Methyl bromide in preindustrial air: Measurements from an Antarctic ice core
Journal of Geophysical Research: Atmospheres, v 109(D5), pp D05301-n/a
16 Mar 2004
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
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.
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Details
- Title
- Methyl bromide in preindustrial air: Measurements from an Antarctic ice core
- Creators
- Eric S. Saltzman - University of California, IrvineMurat Aydin - University of California, IrvineWarren J. De Bruyn - Chapman UniversityDaniel B. King - Drexel UniversityShari A. Yvon-Lewis - NOAA Atlantic Oceanographic and Meteorological Laboratories
- Publication Details
- Journal of Geophysical Research: Atmospheres, v 109(D5), pp D05301-n/a
- Number of pages
- 8
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000220224500001
- Scopus ID
- 2-s2.0-2642551638
- Other Identifier
- 991020546575204721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Meteorology & Atmospheric Sciences