Comparison of ground-based FTIR and Brewer Osub3/sub total column with data from two different IASI algorithms and from OMI and GOME-2 satellite instruments

摘要

An intercomparison of ozone total column measurements derived fromvarious platforms is presented in this work. Satellite data from InfraredAtmospheric Sounding Interferometer (IASI), Ozone Monitoring Instrument(OMI) and Global Ozone Monitoring Experiment (GOME-2) are compared with datafrom two ground-based spectrometers (Fourier Transform Infrared spectrometerFTIR and Brewer), located at the Network for Detection of AtmosphericComposition Change (NDACC) super-site of Iza?a (Tenerife), measuredduring a campaign from March to June 2009. These ground-based observingsystems have already been demonstrated to perform consistent, precise andaccurate ozone total column measurements. An excellent agreement betweenground-based and OMI/GOME-2 data is observed. Results from two differentalgorithms for deriving IASI ozone total column are also compared: theEuropean Organisation for the Exploitation of Meteorological Satellites(EUMETSAT/ESA) operational algorithm and the LISA (LaboratoireInter-universitaire des Systèmes Atmosphériques) algorithm. A betteragreement was found with LISA's analytical approach based on analtitude-dependent Tikhonov-Philips regularization: correlations are 0.94and 0.89 compared to FTIR and Brewer, respectively; while the operationalIASI ozone columns (based on neural network analysis) show correlations of0.90 and 0.85, respectively, compared to the O₃ columns obtained fromFTIR and Brewer.