HR: 0800h
AN: A21A-0823    [Abstracts]
TI: 3D Model Study of the 'Bromine Explosion' in Polar Regions
AU: * Yang, X
EM: xin.yang@atm.ch.cam.ac.uk
AF: Centre for Atmospheric Science, University of Cambridge, Cambridge, CB2 1EW United Kingdom
AU: Pyle, J A
EM: john.pyle@atm.ch.cam.ac.uk
AF: Centre for Atmospheric Science, University of Cambridge, Cambridge, CB2 1EW United Kingdom
AU: Cox, R A
EM: rac26@cam.ac.uk
AF: Centre for Atmospheric Science, University of Cambridge, Cambridge, CB2 1EW United Kingdom
AU: Kaleschke, L
EM: lkalesch@iup.physik.uni-bremen.de
AF: Institute of Environmental Physics, University of Bremen, Bremen, POB:330440 Germany
AB: We use an extended off-line 3D tropospheric chemical transport model p-TOMCAT by incorporating a detailed bromine chemistry scheme, which contains gas-phase and heterogeneous reactions on aerosols. There are three bromine sources considered in this study, from sea-salt, bromocarbons and frost flowers. The distribution and formation of frost flowers in the marginal sea ice zones of polar regions are described according to satellite ice concentration data and meteorological data, respectively. The heterogeneous bromine release from frost flowers is found to supply a large amount of bromine that may induce 'Bromine Explosion' (BE) events during polar spring. Very high concentrations of total inorganic bromine species and BrO are simulated during the BE events which result in significant ozone losses.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005