Measurements of atmospheric methyl bromide and bromoform

We have measured gaseous methyl bromide (CH3Br) and bromoform (CHBr3) in air samples that were gathered approximately weekly from five ground-level sites: Point Barrow, Alaska; Mauna Loa Observatory and Cape Kumukahi, Hawaii; Matatula, Samoa; and Kaitorete Spit, New Zealand. Approximately 750 sample...

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Bibliographic Details
Published in:Journal of Geophysical Research
Main Authors: Cicerone, RJ, Heidt, LE, Pollock, WH
Format: Article in Journal/Newspaper
Language:English
Published: eScholarship, University of California 1988
Subjects:
New Zealand
Barrow
Point Barrow
Alaska
Online Access:http://www.escholarship.org/uc/item/0hc5k7dn
Description
Summary:We have measured gaseous methyl bromide (CH3Br) and bromoform (CHBr3) in air samples that were gathered approximately weekly from five ground-level sites: Point Barrow, Alaska; Mauna Loa Observatory and Cape Kumukahi, Hawaii; Matatula, Samoa; and Kaitorete Spit, New Zealand. Approximately 750 samples have been analyzed for CH3Br between January 1985 and October 1987 and 990 samples have been analyzed for CHBr3 between early 1984 and September 1987, all by gas chromatography/mass spectometry. Methyl bromide concentrations are typically 10-11 parts per trillion (ppt) by volume; there are no clear indications of temporal increases. Bromoform concentrations are typically 2-3 ppt, but large seasonal variations are seen at Point Barrow. -Authors

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