Abstract

Remote sensing measurements of total column amounts by spectroscopic techniques heavily rely on spectroscopic parameters for the target and interfering species, and on a priori vertical profile information. This paper discusses recent updates of O₃ and NO₂ datasets at the Jungfraujoch and Harestua primary and secondary NDSC (Network for Detection of Stratospheric Changes) stations, resp., from high-resolution EHR (Fourier Transform Infrared) and DOAS (Differential Optical Absorption Spectroscopy) UV/Visible observations. The former are direct-sun absorption measurements throughout the day under clear-sky conditions, the latter are zenith-sky scattered light measurements, daily at twilight. At the Jungfraujoch (ISSJ) the latter are performed with a SAOZ instrument since mid-1990; at Harestua, a home-made, NDSC-qualified instrument has been operated since 1993, on a more or less continuous basis. Two FTIR spectrometers, a Bruker IFS 120HR and a home-made FTS are operated on a regular basis at ISSJ; the FTIR database for NO₂ starts in 1985.

© 1997 Optical Society of America