HR: 1340h
AN: A13D-0979    [Abstracts]
TI: Ozone Loss, Chlorine Activation and Denitrification in the Arctic Polar Vortex 2004/2005: in Situ Observations and Model Results
AU: von Hobe, M
EM: m.von.hobe@fz-juelich.de
AF: Institut fuer Chemie und Dynamik der Geosphäre I: Stratosphäre (ICG-I), Forschungszentrum Jülich, Jülich, 52425 Germany
AU: * Grooss, J
EM: j.-u.grooss@fz-juelich.de
AF: Institut fuer Chemie und Dynamik der Geosphäre I: Stratosphäre (ICG-I), Forschungszentrum Jülich, Jülich, 52425 Germany
AU: Ulanovski, A
EM: alexey@caomsk.mipt.ru
AF: Central Aerological Observatory, Pervomayskaya Str. 3, Dolgoprudny, Moscow, 141700 Russian Federation
AU: Volk, C M
EM: m.volk@meteor.uni-frankfurt.de
AF: Institut für Atmosphäre und Umwelt, J.-W. Goethe Universität Frankfurt, Georg Voigt Strasse 14, Frankfurt am Main, 60325 Germany
AU: Gunther, G
EM: g.guenther@fz-juelich.de
AF: Institut fuer Chemie und Dynamik der Geosphäre I: Stratosphäre (ICG-I), Forschungszentrum Jülich, Jülich, 52425 Germany
AU: Konopka, P
EM: p.konopka@fz-juelich.de
AF: Institut fuer Chemie und Dynamik der Geosphäre I: Stratosphäre (ICG-I), Forschungszentrum Jülich, Jülich, 52425 Germany
AU: Tilmes, S
A13D-0979 AF: Institut fuer Chemie und Dynamik der Geosphäre I: Stratosphäre (ICG-I), Forschungszentrum Jülich, Jülich, 52425 Germany
AU: Tilmes, S
A13D-0979 AF: National Center of Atmospheric Research (ACD), 1850 Table Mesa Drive, Boulder, CO 80305 United States
AU: Werner, A
EM: anja.werner@meteor.uni-frankfurt.de
AF: Institut für Atmosphäre und Umwelt, J.-W. Goethe Universität Frankfurt, Georg Voigt Strasse 14, Frankfurt am Main, 60325 Germany
AU: Müller, R
EM: ro.mueller@fz-juelich.de
AF: Institut fuer Chemie und Dynamik der Geosphäre I: Stratosphäre (ICG-I), Forschungszentrum Jülich, Jülich, 52425 Germany
AU: Stroh, F
EM: f.stroh@fz-juelich.de
AF: Institut fuer Chemie und Dynamik der Geosphäre I: Stratosphäre (ICG-I), Forschungszentrum Jülich, Jülich, 52425 Germany
AB: The Arctic polar stratosphere experienced very low temperatures and thus extensive PSC formation over an unusually long period of time during the boreal winter 2004/2005, leading to massive chlorine activation and denitrification causing significant ozone loss. In situ measurements of ozone, halogen species and tracers from this winter are presented which were carried out during a test flight of the high altitude research aircraft M55 Geophysica into the Arctic polar vortex on 7. March 2005. Observations of ClO and Cl₂O₂ revealed almost complete chlorine activation at some altitudes between 14 and 20 km. In box model simulations with the Lagrangian model CLaMS, the observed amounts of active chlorine above 17 km can only be reproduced assuming significant denitrification, in good agreement with longer CLaMS simulations with complete heterogeneous chemistry and sedimentation schemes. A comparison of observed ozone with a proxy for unperturbed ozone inferred from tracer data suggests ozone loss as high as 50%, which is well reproduced by the CLaMS simulations. Results from this winter are particularly interesting in the context of future climate change which may cause long periods with temperatures below T_NAT to become a regular feature in the winter Arctic stratosphere.
DE: 0325 Evolution of the atmosphere (1610, 8125)
DE: 0340 Middle atmosphere: composition and chemistry
DE: 1610 Atmosphere (0315, 0325)
DE: 1630 Impacts of global change (1225)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005