First Results on the DOAS-Retrieval of OClO from SCIAMACHY Nadir Measurements

摘要: The Scanning Imaging Absorption Spectrometer for Atmospheric Chartography was launched successfully onboard ENVISAT on March 1, 2002. It observes solar radiation transmitted, backscattered from the atmosphere and reflected ground in nadir, limb and occultation viewing modes. Chlorinedioxide (OClO), an important indicator for stratospheric chlorine activation, can be measured UV spectral range by Differential Optical Absorption Spectroscopy (DOAS). First results of DOAS retrieval OClO slant column densities (SCDs) SCIAMACHY measurements are presented. influence several parameters like the wavelength chosen as fitting window or reference spectra included fit quality is examined. found that a proper correction of polarisation features spectra essential good DOAS analysis OClO. SCDs derived are compared to measurements Global Ozone Monitoring Experiment (GOME) which has successfully measured since 1995. flies same orbit, but measures approx. 30 minutes earlier than GOME. As shows strong diurnal variation, this leads differences observed column densities, may be useful investigate photochemistry related compounds. Also, spatial resolution higher (30*60 km^2 40*320 GOME), will allow more detailed study small scale effects e.g. activation mountain waves.