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

Loyola, Diego and Koukouli, MariLiza and Valks, Pieter and Balis, Dimitris and Hao, Nan and Van Roozendael, Michel and Spurr, Robert and Zimmer, Walter and Kiemle, Stephan and Lerot, Christophe and Lambert, J.-C. (2011) The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation. Journal of Geophysical Research, 116 (D07302), pp. 1-11. DOI: 10.1029/2010JD014675.

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Official URL: http://dx.doi.org/10.1029/2010JD014675


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.

Document Type:Article
Title:The GOME-2 total column ozone product: Retrieval algorithm and ground-based validation
AuthorsInstitution or Email of Authors
Loyola, Diegodiego.loyola@dlr.de
Koukouli, MariLizaAUTH
Valks, Pieterpieter.valks@dlr.de
Balis, DimitrisAUTH
Hao, Nannan.hao@dlr.de
Van Roozendael, MichelBIRA-IASB
Spurr, RobertRT Solutions
Zimmer, WalterWalter.Zimmer@dlr.de
Kiemle, Stephanstephan.kiemle@dlr.de
Lerot, ChristopheBIRA-IASB
Lambert, J.-C.BIRA-IASB
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-11
Keywords:GOME-2 total ozone; validation
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Ozon-SAF (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
German Remote Sensing Data Center > Information Technology
Deposited By: Diego Loyola
Deposited On:07 Apr 2011 07:45
Last Modified:23 Jan 2014 11:36

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