HR: 0800h
AN: A21A-0839    [Abstracts]
TI: Oceanic Contributions of Bromine to the Atmosphere
AU: * King, D B
EM: daniel.king@drexel.edu
AF: Drexel University, Department of Chemistry, Philadelphia, PA 19104 United States
AU: Butler, J H
EM: James.H.Butler@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305 United States
AU: Aydin, M
EM: maydin@uci.edu
AF: University of California, Irvine, 3325 Croul Hall, Irvine, CA 92697 United States
AU: Mondeel, D J
EM: Debra.J.Mondeel@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305 United States
AU: Mondeel, D J
EM: Debra.J.Mondeel@noaa.gov
AF: CIRES/University of Colorado, 216 UCB - Room 318, Boulder, CO 80309 United States
AU: Montzka, S A
EM: Stephen.A.Montzka@noaa.gov
AF: NOAA/CMDL, 325 Broadway, Boulder, CO 80305 United States
AB: In addition to their role in tropospheric chemistry, brominated compounds are significant contributors to the removal of stratospheric ozone, although uncertainties remain in the ability to balance the cycling of bromine in the atmosphere. In the past, modeling studies have assumed methyl bromide to be the sole source of bromine to the stratosphere, but the potential importance of short-lived brominated compounds, such as dibromomethane and bromoform, has been a subject of increased study. These short-lived compounds could be transported to the upper troposphere and lower stratosphere in significant amounts in equatorial regions, where rapid vertical transport occurs in the atmosphere. During summer 2004, we measured the concentrations of a suite of brominated compounds, including dibromomethane, bromoform and methyl bromide, in surface seawater and the overlying atmosphere. The cruise (PHASE-1) departed Guam in late May and arrived in Oregon in early July. Seawater saturations and air-sea fluxes have been calculated from these measurements. In equatorial waters, methyl bromide was generally undersaturated (-23%), while bromoform (+325%) and dibromomethane (+130%) were supersaturated. Bromine budgets will be reported for both atmospheric concentrations (methyl bromide is the largest component) and air-sea fluxes (bromoform is the largest component).
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere: composition and chemistry
DE: 4820 Gases
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005