Available data

All three instruments, GOME, SCIAMACHY, and GOME2/METOP-A are continuing their operation. GOME was launched aboard ERS-2 in 1995. Starting in July 2003 GOME lost global coverage due to a failure of the on-board tape recorder. The coverage has been initially limited to the European Atlantic sector. With the addition of additional ground stations the coverage has been incrementally increased. The long GOME data record is very useful as a reference for the SCIAMACHY and GOME2 data in the merged data product.

SCIAMACHY provides measurements since August 2002. GOME2 was launched a board Metop A in 2006 and delivers data since January 2007.

Merged GOME/SCIAMACHY/GOME2 total ozone

Total ozone data sets

Overpass data for ground stations

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Retrieval and validation

Scientific total ozone data products from GOME (1995-present) and SCIAMACHY (2002-present) are available. This data has been retrieved using the weighting function differential optical apsorption spectroscopy (WFDoas) approach.

This new algorithm has been carefully validated by comparison with ground-based data from Brewer and Dobson spectrophotometer network. The new retrieval scheme as well as the validation results have been published in Atmospheric Physics and Chemistry (ACP).

Some additional information on WFDoas can be found in the viewgraphs from a presentation at the Quadrennial Ozone Symposium 2004 (PDF, 0.8Mb).

Figure 2. Differences between GOME(top) and SCIAMACHY (bottom) and Brewer data from Hohenpeissenberg (47°N, 10°E) in South Germany from 1995 to 2005.

The accuracy of the WFDoas retrieval has been assessed to be 3% for most conditions and about 5% at high solar zenith angles (low sun). The comparison with ground based Brewer and Dobson spectrophotometer data show excellent agreement to within 1% and up to 8% at high solar zenith angles (high latitudes and near polar night). No significant seasonal cycle signatures are apparent in the differences between the satellite and Brewer data. Some seasonal varations is seen with Dobson data. The SCIAMACHY data show a trend of about -3 to -4% per decade with respect to GOME data. GOME2 data has an average bias of -1% when compared to GOME. Trends and biases are corrected in the merged data set combining all instruments.

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Implementation of WFDOAS

Several improvements in the retrieval algorithm have enhanced the data quality of WFDoas total ozone:

  • correction of molecular Ring effect accounting for the ozone absorption dependent contribution.
  • use of retrieved reflectivities (albedos) in the ozone retrieval
  • effective scene height determined from cloud-top height and cloud fraction information derived in the oxygen A-band in combination with the terrain height of the observed GOME ground pixel.
  • Improved determination of ghost vertical column that is added to the retrieved column to account for missing ozone below clouds

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If you have any questions, need more information, or have a request for specific data sets, please contact Mark.Weber@uni-bremen.de.

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References related to ozone retrieval at IUP Bremen

  • K. Bramstedt, K.-U. Eichmann, M. Weber, R. Hoogen, V. Rozanov, and J.P. Burrows, Ozone depletion in the Arctic spring calculated from GOME Ozone Profiles, European Symposium on Atmospheric Measurements from Space, Proc. ESAMS'99, ESA-WPP-161, 225-229, 1999.
  • A. Bracher, M. Weber, K. Bramstedt, S. Tellmann, J. P. Burrows, Long-term global measurements of ozone profiles by GOME validated with SAGE II considering atmospheric dynamics, J. Geophys. Res. 109, D20308, doi 10.1029/2004JD004677, 2004.
  • A. Bracher, L.N. Lamsal, M. Weber, K. Bramstedt, M. Coldewey-Egbers, J. P. Burrows, Global satellite validation of SCIAMACHY O3 columns with GOME WFDOAS, Atmos. Chem. Phys. 5, 2357-2368, 2005.
  • K. Bramstedt, K.-U. Eichmann, M. Weber, V. Rozanov, and J. P. Burrows, GOME ozone profiles: A global validation with HALOE measurements, Adv. Space Res. 29, 1637-1642, 2002.
  • K. Bramstedt, J. Gleason, D. Loyola, W. Thomas, A. Bracher, M. Weber, and J. P. Burrows, Comparison of total ozone from the satellite instruments GOME and TOMS with measurements from the Dobson network 1996-2000, Atmospheric Chemistry and Physics 3, 1409-1419, 2003.
  • H. Bremer, M. von König, A. Kleinböhl, H. Küllmann, K. Künzi, K. Bramstedt, J. P. Burrows, K.-U. Eichmann, M. Weber, A. P. H. Goede, Ozone depletion observed by ASUR during the Arctic Winter 1999/2000, J. Geophys. Res. 107, 8277, doi:10.1029/2001JD000546, 2002.
  • K.V. Chance, J.P. Burrows, D.Perner, and W. Schneider, Satellite measurements of atmospheric ozone profiles from ultravisible measurements in the nadir geometry: a potential method to retrieve tropospheric ozone, J. Quant. Spectrosc. Radiat. Transfer 57, 467-476, 1997.
  • M. Coldewey-Egbers, M., M. Weber, M. Buchwitz, and J.P. Burrows, Application of a modified DOAS method for total ozone retrieval from GOME data at high polar latitudes, Adv. Space Res. 34, 749-753, 2004.
  • M. Coldewey-Egbers, M. Weber, L. N. Lamsal, R. de Beek, M. Buchwitz, J. P. Burrows, Total ozone retrieval from GOME UV spectral data using the weighting function DOAS approach, Atmos. Chem. Phys. 5, 5015-5025, 2005.
  • R. de Beek, M. Weber, V.V. Rozanov, A. Rozanov, A. Richter, and J.P. Burrows, Trace gas column retrieval - An error study for GOME-2, Adv. Space Res. 34, 727-733, 2004.
  • K.-U. Eichmann, K. Bramstedt, M. Weber, R. Hoogen, V.V. Rozanov, and J.P. Burrows, Structure of ozone mini-holes from GOME, European Symposium on Atmospheric Measurements from Space, Proc. ESAMS'99, ESA-WPP-161, 231-236, 1999.
  • K.-U. Eichmann, K. Bramstedt, M. Weber, V.V. Rozanov, R. Hoogen and J.P. Burrows, O3 profiles from GOME satellite data - II: Observations in the Arctic spring 1997 and 1998, Physics and Chemistry of the Earth 24, 453-457, 1999.
  • K.-U. Eichmann, M. Weber, K. Bramstedt, and J.P. Burrows, Ozone depletionin the NH winter/spring 1999/2000 as measured by GOME-ERS2, J. Geophys. Res. 107, 8280, doi:10.1029/2001JD001148, 2002.
  • V. E. Fioletov, G. Labow, R. Evans, E. W. Hare, U. Köhler, C. T. McElroy, K. Miyagawa, A. Redondas, V. Savastiouk, A. M. Shalamyansky, J. Staehelin, K.Vanicek, and M.Weber, The performance of the ground-based total ozone network assessed using satellite data, J. Geophys. Res., 113, D14313, doi:10.1029/2008JD009809, 2008.
  • G. Hansen, K. Bramstedt, V. Rozanov, M. Weber, and J.P. Burrows, Validation of GOME ozone profiles by means of the ALOMAR ozone lidar, Annales Geophysicae 21, 1879-1886, 2003.
  • R. Hoogen, V.V. Rozanov, J.P. Burrows, Ozone Profiles from GOME Satellite Data: Algorithm Description and First Validation, J. Geophys. Res., 104, 8263-8280, 1999.
  • R. Hoogen, V.V. Rozanov, K. Bramstedt, K.-U. Eichmann, M. Weber, and J.P. Burrows, Ozone profiles from GOME satellite data-I: Comparison with ozonesonde measurements, Physics and Chemistry of the Earth 24, 447-452, 1999.
  • A.A. Kokhanovsky, B. Mayer, V.V. Rozanov, K. Wapler, L. Lamsal, M. Weber, J.P. Burrows, U. Schumann, Satellite ozone retrieval under broken cloud conditions: an error analysis based on Monte-Carlo simulations, IEEE Transactions Geosci. Remote Sens. 45, 187-194, 2007.
  • L.N. Lamsal, M. Weber, G. Labow, and J.P. Burrows, Influence of ozone and temperature climatology on the accuracy of satellite total ozone retrieval, J. Geophys. Res.,112, D02302, doi:10.1029/2005JD006865, 2007. (PDF, 1.7Mb)
  • L. N. Lamsal, M. Weber, S. Tellmann, and J. P. Burrows, Ozone column classified climatology of ozone and temperature profiles based on ozonesonde and satellite data, J. Geophys. Res., accepted, 2004.
  • C. Lee, A. Richter, M. Weber, and J.P. Burrows, SO2 retrieval from SCIAMACHY using the weighting function DOAS (WFDOAS) technique: Comparison with standard DOAS retrieval, Atmos. Chem. Phys., 8, 6137-6145, 2008.
  • M.D. Müller, A. Kaifel, M. Weber, J.P. Burrows, A new method for retrieving total ozone from GOME data, Appl. Opt. 41, 5051-5058, 2002.
  • M.D. Müller, A.K. Kaifel, M. Weber, S. Tellmann, J.P. Burrows, D. Loyola, Ozone profile retrieval from GOME data using a neural network approach (NNORSY), J. Geophys. Res. 108, 4497, doi:10.1029/2002JD002784, 2003.
  • A. Richter, F. Wittrock, M. Weber, S. Beirle, S. Kühl, U. Platt, T. Wagner, W. Wilms-Grabe, and J. P. Burrows, GOME observations of stratospheric trace gas distributions during the splitting vortex event in the Antarctic winter 2002 Part I: Measurements, J. Atmos. Sci. 62, 778-785, 2005.
  • C. von Savigny, A. Rozanov, H. Bovensmann, K.-U. Eichmann, S. Noel, V. V. Rozanov, B.-M. Sinnhuber, M. Weber, J. P. Burrows, J. Kaiser, The ozone hole break-up in September 2002 as seen by SCIAMACHY on ENVISAT, J. Atmos. Sci., 62, 721-734, 2005.
  • B.-M. Sinnhuber, M. Weber, A. Amankwah, and J.P. Burrows, Total ozone during the unusual Antarctic winter of 2002, Geophys. Res. Lett. 30, 1850, doi:10.1029/2002GL016798, 2003.
  • S. Tellmann, S., V.V. Rozanov, M. Weber, and J.P. Burrows, Improvements in the tropical ozone profile retrieval from GOME UV/vis nadir spectra, Adv. Space Res. 34, 739-743, 2004.
  • M. Weber, K.-U. Eichmann, F. Wittrock, K. Bramstedt, L. Hild, A. Richter, J.P. Burrows, and R. Müller, The cold Arctic winter 1995/96 as observed by the Global Ozone Monitoring experiment GOME and HALOE: Tropospheric wave activity and chemical ozone loss, Q. J. Roy. Meteor. Soc. 128, 1293-1319, 2002.
  • M. Weber, S. Dhomse, F. Wittrock, A. Richter, B.-M. Sinnhuber, and J.P. Burrows, Dynamical Control of NH and SH Winter/Spring Total Ozone from GOME Observations in 1995-2002, Geophys. Res. Lett., 30, 1853, doi:10.1029/2002GL016799, 2003.
  • Y. Meijer, D.P.J. Swart, F. Baier, P.K. Barthia, G.E. Bodeker, S. Casadio, K. Chance, F. del Frate, T. Ebertseder, L.E. Flynn, S. Godin-Beekmann, G. Hansen, O.P. Hasekamp, A. Kaifel, H.M. Kelder, B.J. Kerridge, J.-C. Lambert, J. Landgraf, B. Latter, X. Liu, I.S. McDermid, M.D. Müller, Y. Pachepsky, V. Rozanov, R. Siddans, S. Tellmann, R.J. van der A, R.F. van Oss, M. Weber, and C. Zehner, Evaluation of GOME ozone profiles from nine different algorithms, J. Geophys. Res., 111, D21306, doi:10.1029/2005JD006778, 2006.
  • M. Weber, L. N. Lamsal, M. Coldewey-Egbers, K. Bramstedt, J. P. Burrows, Pole-to-pole validation of GOME WFDOAS total ozone with groundbased data, Atmos. Chem. Phys. 5, 1341-1355, 2005.


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This work has been funded in parts by ESA project GOTOCORD (ESRIN/16402/02/I-LG), the German AFO2000 project GOMSTRAT (07ATF42), EU project CANDIDOZ (EVK2-CT-2001-00133), and DFG SHARP (DFG Research Unit 1095).

last change: 2010/03/28   Author: Mark Weber
Institute of Environmental Physics, University of Bremen