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- C23C-0934: Methyl Bromide Measurements from Antarctic Ice Cores
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Board 0934‚ Hall EFG (Poster Hall)NOLA CC
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Murat Aydin, University of California Irvine (First Author, Presenting Author)
John Patterson, University of California Irvine
Melinda Nicewonger, Oregon State University
Jennifer Campos Ayala, University of California Irvine
Austin Carter, Scripps Institution of Oceanography
Sarah Aarons, Scripps Institution of Oceanography
Julia Marks Peterson, Oregon State University
Jenna Epifanio, Oregon State University
Alissa Choi, University of Wisconsin Madison
Christo Buizert, Oregon State University
Edward Brook, Oregon State University
Eric Saltzman, University of California Irvine
Methyl bromide (CH3Br) is the most abundant brominated gas in the atmosphere, accounting for about 20% of the reactive halogen load in the stratosphere today. Atmospheric sources of CH3Br include biological emissions from land ecosystems and from the world ocean, with additional emissions from wild fires. We measured CH3Br in air extracted from ice cores from three Antarctic sites with the ultimate goal to determine atmospheric CH3Br variability across glacial-interglacial climate transitions. Results from two of the ice cores display elevated CH3Br levels during glacial periods that are unlikely to reflect atmospheric levels. The results from the third ice core display a substantial increase coincident with the penultimate glacial-interglacial climate transition. This result suggests a robust increase in the natural emissions of CH3Br as a response to the penultimate glacial-interglacial transition.
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