GLOBAL COMPARISONS OF TOTAL O{sub}3 COLUMNS FROM SCIAMACHY WEIGHTING FUNCTION DOAS (WFD) ALGORITHM TO OMI-TOMS, GOME WFD AND GROUND-BASED MEASUREMENTS

摘要

The new satellite instruments SCIAMACHY (SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY) on ENVISAT launched in March 2002 and OMI (Ozone Monitoring Instrument) on AURA, launched in July 2004 deliver global data sets of total ozone columns. Global stratospheric ozone columns from SCIAMACHY are compared to satellite data of its predecessor GOME (Global Ozone Monitoring Experiment) on ERS-2 and of OMI and to ground-based data from Northern Hemispheric Brewer stations to validate the data set and detect biases between these satellite data sets. The comparisons are also analysed for dependencies to total ozone, solar zenith angle, season, latitude and cloud fraction. Data sets for SCIAMACHY and GOME are retrieved using the weighting function DOAS algorithm (WFD; Version 1.0 for both instruments). For OMI the operational product retrieved with the TOMS algorithm (OMI-TOMS) is used. Results help to understand how these different global total ozone data sets can be linked together for ozone trend studies.