Chemical ozone loss in the Arctic winter 1991–1992 S. Tilmes1, R. Müller2, R. J. Salawitch3, U. Schmidt4, C. R. Webster3, H. Oelhaf5, C. C. Camy-Peyret6, and J. M. Russell III7 1National Center for Atmospheric Research, Boulder, Colorado, USA 2Institute for Stratospheric Research (ICG-1), Forschungszentrum Jülich, Germany 3Jet Propulsion Laboratory, California Institute of Technology, California, USA 4J.W. Goethe University Frankfurt, Germany 5IMK-ASF, Forschungszentrum Karlsruhe, Karlsruhe, Germany 6Universite Pierre et Marie Curie and CNRS, Ivry-sur-Seine, France 7Hampton University, Virginia 23668, USA
Abstract. Chemical ozone loss in winter 1991–1992 is recalculated based on observations of the
HALOE satellite instrument, Version 19, ER-2 aircraft measurements and
balloon data. HALOE satellite observations are shown to be reliable in the lower
stratosphere below 400 K, at altitudes where the measurements are most likely
disturbed by the enhanced sulfate aerosol loading, as a result of the Mt.~Pinatubo
eruption in June 1991. Significant chemical ozone loss (13–17 DU) is observed
below 380 K from Kiruna balloon observations and HALOE satellite data
between December 1991 and March 1992.
For the two winters after the Mt. Pinatubo eruption, HALOE
satellite observations show a stronger extent of chemical
ozone loss towards lower altitudes compared to other Arctic winters between
2003. In spite of already occurring deactivation of chlorine in March 1992,
MIPAS-B and LPMA balloon observations indicate that chlorine was still activated
at lower altitudes,
consistent with observed chemical ozone loss occurring between February and
March and April. Large chemical ozone loss of more than 70 DU in the
Arctic winter 1991–1992 as calculated in earlier studies is corroborated here.
Citation: Tilmes, S., Müller, R., Salawitch, R. J., Schmidt, U., Webster, C. R., Oelhaf, H., Camy-Peyret, C. C., and Russell III, J. M.: Chemical ozone loss in the Arctic winter 1991–1992, Atmos. Chem. Phys., 8, 1897-1910, doi:10.5194/acp-8-1897-2008, 2008.