OBSERVED TRENDS IN TOTAL VERTICAL COLUMN ABUNDANCES OF ATMOSPHERIC GASES FROM IR SOLAR SPECTRA RECORDED AT THE JUNGFRAUJOCH

Since 1984, about 15 000 high quality infrared solar spectra have been recorded with state-of-the-art grating and Fourier transform spectrom eters at the International Scientific Station of the Jungfraujoch, Swi tzerland. Nonlinear least squares spectral curve fitting of selected m icrowindows containing isolated and well characterized lines of 20 tel luric gases have allowed to retrieve their total vertical column abund ances above the station, leading to observational data bases essential to derive long- and short-term changes experienced by these species d uring the last 12 years. In this paper, we focus on atmospheric gases of particular interest within the context of the EUROTRACTOR (Troposph eric Ozone Research) project; secular evolution as well as seasonal cy cles of the minor constituents CH4, CO and of the trace gases C2H6, OC S, C2H2, HCN and H2CO are reported and discussed. The long-lived N2O i s included as a tracer of the dynamic activity of the atmosphere.