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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).
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- 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.
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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.
- 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.
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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Contact
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
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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)
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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.
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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.
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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.
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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.
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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.
Acknowledgement
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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).
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