The Global Ozone Monitoring
Experiment (GOME) is a nadir viewing grating spectrometer measuring radiances in
the visible
and ultraviolet spectral
range. The analysis of sun-normalized nadir spectra from GOME enables us to
retrieve height resolved ozone distributions. The retrieval is based upon the
FURM algorithm (FUll Retrieval Method) which uses the advanced optimal
estimation scheme. The spectral data require accurate radiometric calibration
with regard to the increasing degradation of the instrument with time.
A calibration and degradation correction will be presented which enables us to
extend the spectral range to shorter wavelengths enhancing the stratospheric
information content of the retrieved profiles.
Besides the stratospheric calibration problems the tropospheric ozone column
retrieval is still a large challenge for nadir viewing instruments and some
investigations are shown about tropospherical ozone column retrieval with the
FURM algorithm.