HR: 11:35h
AN: A42B-06    [Abstracts]
TI: Global simulation of Polar Spring Bromine Explosion and ozone Loss
AU: * Yang, X
EM: xin.yang@atm.ch.cam.ac.uk
AF: Chemistry Department University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom
AU: Pyle, J A
EM: john.pyle@atm.ch.cam.ac.uk
AF: Chemistry Department University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom
AU: Cox, R A
EM: rac26@cam.ac.uk
AF: Chemistry Department University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, United Kingdom
AB: By considering sea salt production from sea ice, the bromine explosion events during polar spring time are well re-produced by the 3D global chemical model p-TOMCAT. The simulated tropospheric BrO in both polar spring time are successfully matching the satellite BrO distributions. We find the tropospheric BrO accounts for 30-40% of the total column BrO. The daily averaged BrO concentration in polar free troposphere is of 0.5-1 pptv. Model results also show that the heterogeneous reactivations on aerosols play a significant role in sustaining high BrO partitioning in total bromine. As to ozone loss, a zonal mean lose of 5-8% is simulated in lower troposphere with much higher loss locally. Although there is a significant bromine-induced ozone loss during the bromine explosion events, it is likely that much lower surface ozone concentrations must be a result of air mass isolated from free troposphere for sometime.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0335 Ion chemistry of the atmosphere (2419, 2427)
DE: 0365 Troposphere: composition and chemistry
DE: 0736 Snow (1827, 1863)
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting