HR: 0800h
AN: A21C-0883    [Abstracts]
TI: Antarctic BrO tropospheric and stratospheric columns during the spring of 2002
AU: Johnston, P
EM: p.johnston@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, 9182 New Zealand
AU: Thomas, A
EM: a.thomas@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, 9182 New Zealand
AU: * Schofield, R
EM: Robyn.Schofield@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway R/AL8, Boulder, CO 80305 United States
AU: Kreher, K
EM: k.kreher@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, 9182 New Zealand
AU: Connor, B
EM: b.connor@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, 9182 New Zealand
AU: Wood, S
EM: s.wood@niwa.co.nz
AF: National Institute of Water and Atmospheric Research, Private Bag 50061, Omakau, 9182 New Zealand
AU: Shooter, D
EM: d.shooter@auckland.ac.nz
AF: The University of Auckland, Tamaki Campus, Private Bag 92019 , Auckland, 1020 New Zealand
AU: Chipperfield, M
EM: martyn@env.leeds.ac.uk
AF: School of the Environment, University of Leeds , Leeds, LS2 9JT United Kingdom
AU: Richter, A
EM: Andreas.Richter@iup.physik.uni-bremen.de
AF: Institute of Environmental Physics, University of Bremen P.O. Box 33 04 40, Bremen, D-28334 Germany
AU: von Glasow, R
EM: Roland.von.Glasow@iup.uni-heidelberg.de
AF: Institut fuer Umweltphysik, Universitaet Heidelberg Im Neuenheimer Feld 229, Heidelberg, 69120 Germany
AU: Rodgers, C
EM: c.rodgers@physics.ox.ac
AF: Atmospheric, Oceanic and Planetary Physics, Clarendon Laboratory Parks Road, Oxford, OX1 3PU United Kingdom
AB: Catalytic ozone destruction cycles involving bromine account for ~80% of the stratospheric ozone losses over Antarctica. Also, BrO causes almost complete boundary layer ozone loss in the polar spring and has been linked to increased mercury deposition in the polar regions. Direct-sun and zenith-sky spectroscopic measurements were combined in a DOAS - optimal estimation retrieval of tropospheric and stratospheric BrO columns at different SZAs over the polar spring at Arrival Heights (77.8§S, 166.7§E), Antarctica, in 2002, the year in which there was an unprecedented early warming of the stratosphere which caused a split and weakening of the vortex. Twenty one clear sky twilight periods were investigated and column retrievals were made at SZAs 80§, 84§ and 88§. A high BrO `explosion' event that was detected in the tropospheric column retrievals is shown. Comparison of measured tropospheric columns with tropospheric BrO model calculations is made, as is a comparison of stratospheric column measurements with stratospheric BrO model calculations from SLIMCAT. Finally, comparisons of the retrieved total columns are made with columns measured by the GOME satellite.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0368 Troposphere: constituent transport and chemistry
DE: 1863 Snow and ice (0736, 0738, 0776, 1827)
DE: 4540 Ice mechanics and air/sea/ice exchange processes (0700, 0750, 0752, 0754)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005