VALIDATION OF SCIAMACHY NO_2 VERTICAL COLUMN DENSITIES WITH MT.CIMONE AND STARA ZAGORA GROUND-BASED ZENITH SKY DOAS OBSERVATIONS

摘要

Ground-based zenith sky Differential OpticalrnAbsorption Spectroscopy (DOAS) measurementsrnperformed by means of GASCOD instruments at Mt.rnCimone (44N 11E), Italy and Stara Zagora (42N, 25E),rnBulgaria are used for validation of SCIAMACHY NO_2rnvertical column density (vcd) of ESA SCI_NL productrnretrieved with 5.01 processor version. The resultsrnpresented in this work regard satellite data for the July-rnDecember 2002 period. On this base it is concludedrnthat during summer-autumn period the overall NO_2 vcdrnabove both stations is fairly well reproduced by thernSCIAMACHY data, while towards the winter periodrnthey deviate from the seasonal behaviour of NO_2 vcdrnderived at both stations.