Abstract for presentation at 14th IUAPPA World Congress

Changes in Radiative Forcing and Ozone Depletion Driven by Changes in Trace Gas Composition of the Background Atmosphere, from Pre-industrial Times to the Present

  • Paul Fraser, CSIRO Marine and Atmospheric Research, Australia
  • Laurie Porter, Bureau of Meteorology, Australia
  • Paul Krummel, CSIRO Marine and Atmospheric Research, Australia
  • Dr Paul Steele, CSIRO Marine and Atmospheric Research, Australia
  • Dr Ray Langenfelds, CSIRO Marine and Atmospheric Research, Australia
  • Dr David Etheridge, CSIRO Marine and Atmospheric Research, Australia
  • Nada Derek, CSIRO Marine and Atmospheric Research, Australia

    • Measurements of the major greenhouse gases (carbon dioxide, methane, nitrous oxide, hydrofluorocarbons, perfluorcarbons and sulfur hexafluoride) and ozone depleting chemicals (chlorofluorocarbons, hydrochlorofluorocarbons, halons, methyl bromide, methyl chlorofrom and carbon tetrachloriude) have been made at Cape Grim, Tasmania, since 1976 and on air samples from Antarctic firn and ice since pre-industrial times. From the resultant data describing their long-term concentration trends in the background atmosphere, changes in the radiative forcing (the major driver of climate change) and equivalent chlorine (the major driver of ozone depletion) of the background atmosphere can be made. These will be discussed and compared to long-term changes in temperature in the lower atmosphere and ozone changes in the stratosphere.

    Conference Organiser - ICMS Pty Ltd