Scientific Application of Baseline Observations of a Atmospheric Composition (SABOAC) Part 2

Journal of Atmospheric Chemistry

, Volume 4, Issue 1, pp 3-42

Methane, carbon monoxide and methylchloroform in the southern hemisphere

  • P. J. FraserAffiliated withDivision of Atmospheric Research, CSIRO
  • , P. HysonAffiliated withDivision of Atmospheric Research, CSIRO
  • , R. A. RasmussenAffiliated withDepartment of Chemical, Biological, and Environmental Sciences, Oregon Graduate Center
  • , A. J. CrawfordAffiliated withDepartment of Chemical, Biological, and Environmental Sciences, Oregon Graduate Center
  • , M. A. K. KhalilAffiliated withDepartment of Chemical, Biological, and Environmental Sciences, Oregon Graduate Center

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Abstract

New observational data on CH4, CO and CH3CCl3 in the southern hemisphere are reported. The data are analysed for long term trends and seasonal cycles. CH3CCl3 data are used to scale the OH fields incorporated in a two dimensional model, which in turn, is used to constrain the magnitude of a global CH4 source function. The possible causes of observed seasonality of CH3CCl3, CH4 and CO are identified, and several other aspects of observed CH4 variability are discussed.

Possible future research directions are also given.

Keywords

Methane methylchloroform carbon monoxide Southern Hemisphere trends seasonal cycles hydroxyl radical tow dimensional model methane source function