Trend analysis of greenhouse gases over Europe measured by a network of ground-based remote FTIR instruments
1National Physical Laboratory, Teddington, UK
2Belgisch Instituut voor Ruimte-Aëronomie, Brussels, Belgium
3University of Liège, Institute of Astrophysics and Geophysics, Liège, Belgium
4University of Bremen, Department of Physics, Institute of Environmental Physics, Bremen, Germany
5Forschungszentrum Karlsruhe, Institute of Meteorology and Climate Research, Atmospheric Trace Constituents and Remote Sensing, Karlsruhe, Germany
6Forschungszentrum Karlsruhe, Institute of Meteorology and Climate Research, Atmospheric Environmental Research, Garmish-Partenkirchen, Germany
7Chalmers University of Technology, Göteborg, Sweden
8University of Oslo, Oslo, Norway
Abstract. This paper describes the statistical analysis of annual trends in long term datasets of greenhouse gas measurements taken over ten or more years. The analysis technique employs a bootstrap resampling method to determine both the long-term and intra-annual variability of the datasets, together with the uncertainties on the trend values. The method has been applied to data from a European network of ground-based solar FTIR instruments to determine the trends in the tropospheric, stratospheric and total columns of ozone, nitrous oxide, carbon monoxide, methane, ethane and HCFC-22. The suitability of the method has been demonstrated through statistical validation of the technique, and comparison with ground-based in-situ measurements and 3-D atmospheric models.
Citation: Gardiner, T., Forbes, A., de Mazière, M., Vigouroux, C., Mahieu, E., Demoulin, P., Velazco, V., Notholt, J., Blumenstock, T., Hase, F., Kramer, I., Sussmann, R., Stremme, W., Mellqvist, J., Strandberg, A., Ellingsen, K., and Gauss, M.: Trend analysis of greenhouse gases over Europe measured by a network of ground-based remote FTIR instruments, Atmos. Chem. Phys., 8, 6719-6727, doi:10.5194/acp-8-6719-2008, 2008.