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UP: Umweltphysik
UP 26: Atmosph
äre und Aerosole: Datenauswertung und Modellierung
UP 26.2: Fachvortrag
Wednesday, March 15, 2006, 14:45–15:00, E
Comparison of measured and modelled stratospheric BrO profiles: The need for short-lived bromo-organic source gases — •Marcel Dorf1, Harmut Bösch1, Andre Butz1,2, Claude Camy-Peyret2, Martyn Chipperfield3, Katja Grunow4, Lena Kritten1, Benjamin Simmes1, Frank Weidner1, and Klaus Pfeilsticker1 — 1Institut für Umweltphysik, Universität Heidelberg, Heidelberg, Germany — 2Laboratoire Physique Moléculaire pour l*Atmosphère et l*Astrophysique (LPMAA), Université Pierre et Marie Curie, Paris, France — 3Institute for Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK — 4Meteorologisches Institut, Freie Universität Berlin, Berlin, Germany
Since 1996 stratospheric BrO measurements have been performed on the LPMA / DOAS balloon gondola at mid- and high-latitudes during different seasons and in the tropics. From the UV/vis/near IR solar occultation measurements, vertical profiles of O3, NO, NO2, HNO3, BrO, ClONO2, OClO ... and of some source gases (N2O and CH4) can simultaneously be inferred. The present understanding of the stratospheric BrO photochemistry, with an emphasis on the lowermost stratosphere, and the total Bry budget are tested by comparing measured with photochemically modelled BrO slant column amounts and profiles. The comparison with the model indicates that in addition to the known trend of organic bromine source gases (CH3Br and halons) in the troposphere, short lived bromo-oganic source gases with a lifetime < 0.5 years contribute to total reactive bromine (3.5 to 5 pptv) and mid-latitudinal ozone loss.