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Sixteen years of GOME/ERS-2 total ozone data: The new direct-fitting GOME Data Processor (GDP) version 5-Algorithm description

dc.contributor.authorVan Roozendael, M.
dc.contributor.authorSpurr, R.
dc.contributor.authorLoyola, D.
dc.contributor.authorLerot, C.
dc.contributor.authorBalis, D.
dc.contributor.authorLambert, J.-C.
dc.contributor.authorZimmer, W.
dc.contributor.authorVan Gent, J.
dc.contributor.authorVan Geffen, J.
dc.contributor.authorKoukouli, M.
dc.contributor.authorGranville, J.
dc.contributor.authorDoicu, A.
dc.contributor.authorFayt, C.
dc.contributor.authorZehner, C.
dc.date2012
dc.date.accessioned2016-03-29T10:07:35Z
dc.date.available2016-03-29T10:07:35Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/2969
dc.descriptionThe Global Ozone Monitoring Instrument (GOME) was launched in April 1995 on ESA's ERS-2 platform, and the GOME Data Processor (GDP) operational retrieval algorithm has produced total ozone columns since July 1995. We report on the new GDP5 spectral fitting algorithm used to reprocess the 16-year GOME data record. Previous GDP total ozone algorithms were based on the DOAS method. In contrast, GDP5 uses a direct-fitting algorithm without high-pass filtering of radiances; there is no air mass factor conversion to vertical column amount. GDP5 includes direct radiative transfer simulation of earthshine radiances and Jacobians with respect to total ozone, albedo closure and other ancillary fitting parameters - a temperature profile shift, and amplitudes for undersampling and Ring-effect interference signals. Simulations are based on climatological ozone profiles extracted from the TOMS Version 8 database, classified by total column. GDP5 uses the high-resolution Brion-Daumont-Malicet ozone absorption cross-sections, replacing older GOME-measured flight model data. The semi-empirical molecular Ring correction developed for GDP4 has been adapted for direct fitting. Cloud preprocessing for GDP5 is done using updated versions of cloud-correction algorithms OCRA and ROCINN. The reprocessed GOME GDP5 record maintains the remarkable long-term stability of time series already achieved with GDP4. Furthermore, validation results show a clear improvement in the accuracy of the ozone product with reduced solar zenith angle and seasonal dependences, particularly in comparison with correlative observations from the ground-based network of Brewer spectrophotometers.
dc.languageeng
dc.titleSixteen years of GOME/ERS-2 total ozone data: The new direct-fitting GOME Data Processor (GDP) version 5-Algorithm description
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceScientific
dc.subject.freeAlgorithms
dc.subject.freeMolecular spectroscopy
dc.subject.freeAir mass factor
dc.subject.freeBrewer spectrophotometers
dc.subject.freeData processors
dc.subject.freeData records
dc.subject.freeEarthshine radiance
dc.subject.freeFitting parameters
dc.subject.freeFlight models
dc.subject.freeGround-based network
dc.subject.freeHigh resolution
dc.subject.freeHigh-pass filtering
dc.subject.freeInterference signal
dc.subject.freeJacobians
dc.subject.freeLong term stability
dc.subject.freeMolecular rings
dc.subject.freeOperational retrieval algorithms
dc.subject.freeOzone absorption
dc.subject.freeOzone monitoring instruments
dc.subject.freeOzone profiles
dc.subject.freeRadiative transfer simulations
dc.subject.freeSeasonal dependence
dc.subject.freeSemi-empirical
dc.subject.freeSolar zenith angle
dc.subject.freeSpectral fitting
dc.subject.freeTemperature profiles
dc.subject.freeTotal ozone
dc.subject.freeTotal ozone column
dc.subject.freeTotal ozone data
dc.subject.freeUnder-sampling
dc.subject.freeValidation results
dc.subject.freeVertical columns
dc.subject.freeOzone
dc.subject.freeair mass
dc.subject.freealbedo
dc.subject.freealgorithm
dc.subject.freeclimatology
dc.subject.freedata set
dc.subject.freedatabase
dc.subject.freeERS-2
dc.subject.freeGOME
dc.subject.freemonitoring system
dc.subject.freenumerical model
dc.subject.freeozone
dc.subject.freeradiative transfer
dc.subject.freespectrophotometry
dc.subject.freetemperature profile
dc.subject.freetime series
dc.subject.freevertical profile
dc.subject.freezenith angle
dc.source.titleJournal of Geophysical Research: Atmospheres
dc.source.volume117
dc.source.issue3
dc.source.pageD03305
Orfeo.peerreviewedYes
dc.identifier.doi10.1029/2011JD016471
dc.identifier.scopus2-s2.0-84857083229


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