SCIAMACHY Validation Workshop, 6-8 Dec 2004, Bremen

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SCIAMACHY Validation Workshop, 6-8 Dec 2004,
Bremen
CO, CH4, CO2, and N2O columns retrieved from
SCIAMACHY by WFM-DOAS Algorithm, released data
products, and initial validation/verification
M. Buchwitz, R. de Beek, H. Bovensmann, J. P.
Burrows (IUP/IFE-Bremen)
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Data products released for validation
WFM-DOAS data products Vertical columns of CO,
CH4, CO2, and N2O Dry air column averaged mixing
ratios (O2 normalized columns) XCH4, XCO2, and
XN2O WFM-DOAS Version 0.4 finished in March
2004 processing of first large data set (30
days of 2003) availability of first products
announced on 17 March 2004 Initial validation
results presented at 2nd ENVISAT Validation
Workshop ACVE-2, May 2004, Frascati, ESA/ESRIN -gt
Details see references on next slide Processing
of all consolidated orbits available for the year
2003 availability announced on 6 September 2004
(v0.4) Improved methane (v0.41) announced on 30
September 2004 Analysis ongoing ...
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Recent publications
Atmospheric Chemistry and Physics
(ACP/ACPD) Buchwitz, M., R. de Beek, K.
Bramstedt, S. Noël, H. Bovensmann, and J. P.
Burrows, Global carbon monoxide as retrieved from
SCIAMACHY by WFM-DOAS, ACP, 4, 1945-1960,
2004 Buchwitz, M., R. de Beek, J. P. Burrows, H.
Bovensmann, T. Warneke, J. Notholt, J. F.
Meirink, A. P. H. Goede, P. Bergamaschi, S.
Körner, M. Heimann, J.-F. Muller, and A. Schulz,
Atmospheric methane and carbon dioxide from
SCIAMACHY satellite data Initial comparison with
chemistry and transport models, ACPD,
2004 Warneke, T., de Beek, R., Buchwitz, M., et
al., O., Shipborne solar absorption measurements
of CO2, CH4, N2O, and CO and comparison the
SCIAMACHY WFM-DOAS retrievals, ACPD (submitted),
2004 Sussmann, R., and Buchwitz, M., Validation
of ENVISAT/SCIAMACHY columnar CO by FTIR profile
retrievals at the ground truthing station
Zugspitze, ACPD (submitted), 2004 ENVISAT
validation workshop ACVE-2 (May 2004,
Frascati) de Maziere, M., Barret, B.,
Blumenstock, T., Buchwitz, M., de Beek, R., et
al., Comparison between SCIAMACHY scientific
products and ground-based FTIR data for total
columns of CO, CH4, and N2O, proceedings ACVE-2
(ESA Special Publication), ESA/ESRIN, Frascati,
Italy, 3-7 May 2004, 2004 Gloudemans, A. M. S.,
Schrijver, H., Straume, A. G., Aben, I.,
Maurellis, A. N., Buchwitz, M., de Beek, R., et
al., CH4 and CO total columns from SCIAMACHY
Comparisons with TM3 and MOPITT, proceedings
ACVE-2 (ESA Special Publication), ESA/ESRIN,
Frascati, Italy, 3-7 May 2004, 2004 ENVISAT
Symposium (Sept. 2004, Salzburg) Buchwitz, M.,
R. de Beek, S. Noël, H. Bovensmann, and J. P.
Burrows, Retrieval of CO, H2O, CH4, CO2, ans N2O
columns from SCIAMACHY/ENVISAT by WFM-DOAS
Current status, ESA Special Publication SP-572,
2004.
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WFM-DOAS algorithm
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SCIAMACHY nadir spectrum fitting windows
CO2
O2
CH4, N2O
CO
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Carbon monoxide from SCIAMACHY
Carbon monoxide (CO)
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CO Single overpass
Fires due to biomass burning in Africa Oct 2003
Mozambique CO plumes from fires
Buchwitz et al., ACP, 2004
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CO Single overpass II
Buchwitz et al., ACP, 2004
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CO averaging kernels SCIAMACHY and MOPITT
MOPITT
SCIAMACHY
Emmons et al., JGR, 2004
Buchwitz et al., ACP, 2004
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CO Seasonal averages
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CO Monthly means compared with MOPITT
MOPITT data H. Bremer, IUP-Bremen
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CO Monthly means compared with MOPITT II
MOPITT data H. Bremer, IUP-Bremen
ATSR Fire Atlas
Fires Portugal Aug 2003
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Methane from SCIAMACHY
Methane (CH4)
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Methane v0.4 Comparison with models
TM5 data P. Bergamaschi, JRC, Ispra
Day 2003 IHD SCIA ppbv IHD model ppbv Mean difference SCIA model ppbv Standard Deviation ppbv
Jan 24 53 56 10 (0.6) 97 (5.6)
Mar 28 30 48 -186 (-10.6) 89 (5.1)
May 30 110 56 48 (2.7) 200 (11.3)
Jul 23 31 63 -266 (-15.1) 122 (6.8)
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Methane v0.4 Bias analysis/correction
Gives daily correction factor based on SOST
throughput analysis
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Methane v0.41
1st order bias corrected XCH4 monthly averages
v0.4 XCH4CH4col/(O2col/0.2095)
v0.41 XCH4XCH4v0.4/(XCO2v0.4/370)
Normalization by CO2, see also results from C.
Frankenberg, IUP/Heidelberg
WFM-DOAS v0.4 retrieval errors (in percent)
Buchwitz and Burrows, SPIE, 2004
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Methane v0.41 Comparison with KNMI/TM3 model
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Methane v0.41 Comparison with JRC/TM5 model
Correlation SCIA/WFMD CH4 v0.41 with JRC/TM5
Bias ppbv
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0
Courtesy P. Bergamaschi, JRC, Ispra
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Carbon dioxide from SCIAMACHY
Carbon dioxide (CO2)
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CO2 v0.4 Comparison with TM3/MPI-BGC model
Buchwitz et al., ACPD, 2004
TM3 data S. Körner, MPI-BGC, Jena
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CO2 v0.4 Comparison with TM3 /MPI-BGC model II
Buchwitz et al., ACPD, 2004
TM3 data S. Körner, MPI-BGC, Jena
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CO2 v0.4 Comparison with TM3 /MPI-BGC model III
XCO2-offset MPI-Jena
25 ppm (7)
May 03
8 ppm
Jul 03
Sep 03
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Summary
Preliminary precision and accuracy estimates )
WFM-DOAS Version 0.4 column retrieval
Horizontal resolution km x km Estimated Precision (scatter) Estimated Accuracy (bias)
CO 30 x 120 10 - 20 10 - 30
CH4 30 x 120 1- 6 2 - 15 (v0.41 lt5)
CO2 30 x 60 1 - 4 2 - 5
N2O 30 x 120 10 20 30
) Status ACVE-2 (May 2004) For measurements over
land based on a limited number of data (several
days of the year 2003) Details see Buchwitz et
al., Envisat Sym., 2004, and references given
therein
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Acknowledgements

• This work has been funded by
• BMBF via GSF and DLR-Bonn,
• the European Commission (5th Framework project
  EVERGREEN)
• and the State and the University of Bremen