Temporal and spatial variation in methyl bromide flux from a salt marsh
Article first published online: 29 AUG 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 16, August 2006
How to Cite
2006), Temporal and spatial variation in methyl bromide flux from a salt marsh, Geophys. Res. Lett., 33, L16808, doi:10.1029/2006GL026814., , , and (
- Issue published online: 29 AUG 2006
- Article first published online: 29 AUG 2006
- Manuscript Accepted: 17 JUL 2006
- Manuscript Revised: 13 JUL 2006
- Manuscript Received: 5 MAY 2006
 Methyl bromide (CH3Br) is a trace gas involved in stratospheric ozone depletion with both anthropogenic and natural sources. Estimates of natural source strengths are highly uncertain. In this study, >320 highly temporally and spatially resolved measurements of CH3Br emissions from a salt marsh in Scotland (56°00′N, 2°35′W) were made during one year using eight static enclosures. Net emissions showed both strong seasonal and diurnal cycles. Day-to-day maxima in emissions were associated with sunny days. Emissions dropped to zero when vegetation was removed. Mean measured CH3Br emission was 350 ng m−2 h−1, but a few “hot spots” (measured maximum 4000 ng m−2 h−1) dominated integrated emissions. A crude scale-up of the annual mean emission yields an estimate for global CH3Br emission of ∼1 (0.5–3) Gg y−1 (range uses annual mean from lowest and highest emitting enclosures), ∼10% the global salt marsh emission regularly quoted in the literature.