COMPARISONS BETWEEN SCIAMACHY SCIENTIFIC PRODUCTS AND GROUNDBASED FTIR DATA FOR TOTAL COLUMNS OF CO, CH_4 AND N_2O

摘要

Total column amounts of CO, CH_4 and N_2O retrieved fromrnSCIAMACHY nadir observations in its near-infraredrnchannels have been compared to data from a ground-basedrnnetwork of Fourier-transform infrared (FTIR) spectrometersrnas well as to data obtained with an FTIR instrument duringrna ship cruise in January-February 2003, along the AfricanrnWest Coast. The SCIAMACHY data considered here havernbeen produced by two different scientific retrievalrnalgorithms, wfm-doas (version 4.0) and IMLM (versionrn5.1), and cover different time periods, making the numberrnof reliable coincidences that satisfy the temporal and spatialrncollocation criteria rather limited and different for both.rnAlso the quality of the SCIAMACHY Level 1 data, andrnthus of the Level 2 data for the different time periods isrnvery different. Still the comparisons demonstrate therncapability of SCIAMACHY, using one of both algorithms,rnto deliver geophysically valuable products for the targetrnspecies under consideration, on a global scale.