The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation

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Authors
Loyola, D.G.
Koukouli, M.E.
Valks, P.
Balis, D.S.
Hao, N.
Van Roozendael, M.
Spurr, R.J.D.
Zimmer, W.
Kiemle, S.
Lerot, C.
Lambert, J.-C.
Discipline
Earth and related Environmental sciences
Subject
Algorithms
Atmospheric chemistry
Monitoring
Search engines
Cloud retrieval algorithms
Data processors
Global validation
Ground based
High Latitudes
Intracloud
Large viewing angle
Level 2
Level-1
Metop-a
Negative bias
Northern Hemispheres
Ozone monitoring instruments
Radiative transfer modeling
Retrieval algorithms
Satellite application facilities
Scan angle
Snow and ice
Southern Hemisphere
Sun glint
Total column ozone
Total ozone
Total ozone data
Total ozone measurements
Trace gas
Tropical latitudes
Ozone
algorithm
atmospheric chemistry
GOME
model validation
Northern Hemisphere
ozone
Southern Hemisphere
trace gas
Audience
Scientific
Date
2011Metadata
Show full item recordDescription
The Global Ozone Monitoring Instrument (GOME-2) was launched on EUMESAT's MetOp-A satellite in October 2006. This paper is concerned with the retrieval algorithm GOME Data Processor (GDP) version 4.4 used by the EUMETSAT Satellite Application Facility on Ozone and Atmospheric Chemistry Monitoring (O3M-SAF) for the operational generation of GOME-2 total ozone products. GDP 4.4 is the latest version of the GDP 4.0 algorithm, which is employed for the generation of official Level 2 total ozone and other trace gas products from GOME and SCIAMACHY. Here we focus on enhancements introduced in GDP 4.4: improved cloud retrieval algorithms including detection of Sun glint effects, a correction for intracloud ozone, better treatment of snow and ice conditions, accurate radiative transfer modeling for large viewing angles, and elimination of scan angle dependencies inherited from Level 1 radiances. Furthermore, the first global validation results for 3 years (2007–2009) of GOME-2/MetOp-A total ozone measurements using Brewer and Dobson measurements as references are presented. The GOME-2/MetOp-A total ozone data obtained with GDP 4.4 slightly underestimates ground-based ozone by about 0.5% to 1% over the middle latitudes of the Northern Hemisphere and slightly overestimates by around 0.5% over the middle latitudes in the Southern Hemisphere. Over high latitudes in the Northern Hemisphere, GOME-2 total ozone has almost no offset relative to Dobson readings, while over high latitudes in the Southern Hemisphere GOME-2 exhibits a small negative bias below 1%. For tropical latitudes, GOME-2 measures on average lower ozone by 0% to 2% compared to Dobson measurements.
Citation
Loyola, D.G.; Koukouli, M.E.; Valks, P.; Balis, D.S.; Hao, N.; Van Roozendael, M.; Spurr, R.J.D.; Zimmer, W.; Kiemle, S.; Lerot, C.; Lambert, J.-C. (2011). The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation. , Journal of Geophysical Research: Atmospheres, Vol. 116, Issue 7, D07302, DOI: 10.1029/2010JD014675.Identifiers
scopus: 2-s2.0-79951823398
Type
Article
Peer-Review
Yes
Language
eng