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Continuous observations of atmospheric trace gases by ground-based FTIR spectroscopy at Izaña Observatory, Tenerife Island
Worldwide stratospheric ozone decline is observed with great concern, since it yields an increase of the harmful UV radiation on the Earth surface and it may contribute to climate change. While in the past, it was focusedon the investigation of the polar atmosphere, there is now a growing interest in lower latitudes, where stratospheric O3 is mainly produced and measurement data are still sparse. Therefore, a Fourier spectrometer manufactured by Bruker was installed at the subtropical site of the Izaña Observatory (28°N, 2367 m a.s.l.) on Tenerife, Spain, in February 1999, with the objective to perform long-term measurements. Between February 1999 and July 2001 measurements on approximately 200 days were conducted and analyzed within this work. The height dependent pressure broadening allows to invert trace gas profiles by the measured solar absorption spectra. The inversion was performed using the Tikhonov-Phillips method on a logarithmic scale. The retrieved profiles and column amounts showed typical annual cycles with enhanced upwelling in summer, due to a stratosphere with strong tropical characteristics, and relatively high variability in winter, caused by horizontal transport as a result of enhanced wave activity. We found a good agreement between the column amounts determined by the Fourier spectrometer and those obtained by Differential Optical Absorption Spectroscopy, the Brewer spectrometer, O3 sondes, radiosondes, and measurements conducted simultaneo
Forschungszentrum Karlsruhe
ISSN : 0947-8620
Wissenschaftliche Berichte FZKA A. 2002, vol. 6727, pp. A-156
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