Skip to content
Journal article

Attribution of stratospheric ozone trends to chemistry and transport: A modelling study

Kiesewetter G, Sinnhuber B, Weber M, Burrows J ...see all

Atmospheric Chemistry and Physics, vol. 10, issue 24 (2010) pp. 12073-12089

  • 5

    Readers

    Mendeley users who have this article in their library.
  • N/A

    Citations

    Citations of this article.
  • N/A

    Views

    ScienceDirect users who have downloaded this article.
Sign in to save reference

Abstract

The decrease of the concentration of ozone depleting substances (ODSs) in the stratosphere over the past decade raises the question to what extent observed changes in stratospheric ozone over this period are consistent with known changes in the chemical composition and possible changes in atmospheric transport. Here we present a series of ozone sensitivity calculations with a stratospheric chemistry transport model (CTM) driven by meteorological reanalyses from the European Centre for Medium-Range Weather Forecasts, covering the period 1978-2009. In order to account for the reversal in ODS trends, ozone trends are analysed as piecewise linear trends over two periods, 1979-1999 and 2000-2009. Modelled column ozone (TO3) inter-annual variability and trends are in excellent agreement with observations from the Total Ozone Mapping Spectrometer (TOMS) and Solar Backscatter UV (SBUV/2) as well as the Global Ozone Monitoring Experiment (GOME/GOME2) and Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) instruments. In the period 1979-1999, modelled TO3 trends at mid-latitudes are dominated by changes in in situ gas-phase chemistry, which contribute to about 50% or more of the TO3 trend in most seasons. Changes in meteorology contribute around 35% to mid-latitude TO3 trends, with strong differences between different seasons. In springtime, export of ozone depleted air from polar latitudes contributes about 35-50% to the modelled TO3 trend at SH mid-latitudes and about 15-30% at NH mid-latitudes. Over the period 2000-2009 positive linear trends in modelled TO3, which agree well with observed TO3 trends, are dominated by changes in meteorology, as expected for the yet small decrease in stratospheric halogen loading over this period. While the TO3 trends themselves are not statistically significant over the period 2000-2009, changes in linear trends between 1978-1999 and 2000-2009 are significant at mid- and high latitudes of both hemisphere during most seasons. However, changes in meteorology have contributed substantially to these TO3 trend changes. © 2010 Author(s).

Author-supplied keywords

  • GOME
  • TOMS
  • annual variation
  • atmospheric chemistry
  • atmospheric modeling
  • atmospheric transport
  • chemical composition
  • midlatitude environment
  • ozone
  • ozone depletion
  • stratosphere
  • trend analysis

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Authors

  • G Kiesewetter

  • B.-M. Sinnhuber

  • M Weber

  • J P Burrows

Cite this document

Choose a citation style from the tabs below