Page 1 Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004 SCIAMACHY CO, CH4, N2O scientific data products algorithms: WFM-DOAS v0.4 (UBremen) & IMLM (SRON) comparisons with GB (FT)IR measurements Martine De Mazière Belgian Institute for Space Aeronomy
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Page 1Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
SCIAMACHY CO, CH4, N2Oscientific data products
algorithms:WFM-DOAS v0.4 (UBremen)
&IMLM (SRON)
comparisons with GB(FT)IR measurements
Martine De MazièreBelgian Institute for Space Aeronomy
Page 2Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
H. Schrijver, I. AbenSRON, The Netherlands
M. Buchwitz, R. De Beek, & J. Notholt, T. Warneke
Institute of Environmental Physics, University of Bremen, GermanyT. Blumenstock, A. Griesfeller
Forschungszentrum Karlsruhe, IMK, GermanyE. Mahieu, P. Demoulin,, P. Duchatelet
Institut d'Astrophysique et de Géophysique, University of Liège, BelgiumJ. Mellqvist, A. Strandberg
Chalmers University of Technology, SwedenA. Schulz
Alfred Wegener Institute for Polar and Marine Research (AWI), GermanyR. Sussmann
Forschungszentrum Karlsruhe, IFU, GermanyH. Fast, R. L. Mittermeier & K. Strong
Meteorological Service of Canada (MSC) & University of Toronto, Canada S. Wood, D. Smale
National Institute for Water and Air Research (NIWA), New-ZealandD. Griffith, N. Jones
University of Wollongong, AustraliaC. Rinsland
NASA Langley Research Center, USAD.Ionov
University of St. Petersburg, Russia
Coworkers at BIRA-IASBContributing PI’s
M. De MazièreT. Coosemans
J. GranvilleP. GérardT. Jacobs
K. Janssens J.C. LambertC. Vigouroux
Page 3Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
SCIA_WFMD_v0.4 CO/O2 column anomaly: average of allpixels within 500 km around Zugspitze for daily overpass;cloud falgged pixels removed
Polynomial 3rd order
Polynomial 3rd order
IMK-IFUGarmisch
Are observed variabilities consistent ?
Page 12Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
CO globally – FTIR network versus WFM-DOAS
AO ID126 FTIR network
relative differences SCIA-FTIR (%)
Jan 2003 Nov 2003
Error_based selection
relative differences SCIA-FTIR (%)
AO ID126 FTIR network
Conditions of comparisons with SCIA data:
Open symbols:Same day; +/- 2.5°lat and +/- 10° lon; cloud-free SCIA pixel ;
Yellow filled symbols:Same day; +/- 2.5°lat and +/- 5° lon; cloud-free SCIA pixel ; altitude w/i +/- 250 m
altitude-normalised data
M. De Mazière et al.
Page 13Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
CO globally – FTIR network versus IMLM
July 2002 Mid-April 2003
Error_based selection
relative differences SCIA-FTIR (%)
AO ID126 FTIR network
Conditions of comparisons with SCIA data: Open symbols:Same day; +/- 2.5°lat and +/- 10° lon; cloud-free SCIA pixel ;
Yellow filled symbols:Same day; +/- 2.5°lat and +/- 5° lon; cloud-free SCIA pixel ; altitude w/i +/- 250 m
altitude-normalised data
M. De Mazière et al.
Page 14Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
CHCH44
Page 15Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
1000
1200
1400
1600
1800
2000
2200
2400
-60 -40 -20 0 20 40 60latitude
CH
4 (pp
bv)
SCIA seaSCIA landFTS shipNOAA/CMDL
Cruise FTIR data
Conditions of comparisons with WFM-DOAS data:
Same day ; +/- 1.5°lat ; closest lon; cloud-free SCIA pixel ; error for CH4 over sea < 7%T. Warneke et al.
CH4 cruise data scaled by 0.9 to agree with NOAA/CMDL data
Page 16Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
CH4 globally – FTIR network versus WFM-DOAS
Jan 2003 Mid-Sept 2003
Error_based selection
relative differences SCIA-FTIR (%)AO ID126
FTIR network
Conditions of comparisons with SCIA data:
Open symbols:Same day; +/- 2.5°lat and +/- 10° lon; cloud-free SCIA pixel ;
Yellow filled symbols:Same day; +/- 2.5°lat and +/- 5° lon; cloud-free SCIA pixel ; altitude w/i +/- 250 m
altitude-normalised data
M. De Mazière et al.
Page 17Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
CH4 globally – FTIR network versus IMLM
Mid-April 2003Jan 2003
Error_based selection
relative differences SCIA-FTIR (%)AO ID126
FTIR network
Conditions of comparisons with SCIA data:
Open symbols:Same day; +/- 2.5°lat and +/- 10° lon; cloud-free SCIA pixel ;
Yellow filled symbols:Same day; +/- 2.5°lat and +/- 5° lon; cloud-free SCIA pixel ; altitude w/i +/- 250 m
altitude-normalised data
M. De Mazière et al.
Page 18Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
NN22OO
Page 19Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
0.0E+00
3.0E+18
6.0E+18
9.0E+18
1.2E+19
1.5E+19
1.8E+19
-60 -40 -20 0 20 40 60latitude
N2O
(mol
ecul
es/c
m2 )
sealandFTIR
Cruise FTIR data
Conditions of comparisons with WFM-DOAS data:
Same day ; +/- 1.5°lat ; closest lon; cloud-free SCIA pixel ; error for N2O over sea< 30%T. Warneke et al.
Page 20Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
N2O globally – FTIR network versus WFM-DOAS
Jan 2003 Mid-Sept 2003
Error_based selection
relative differences SCIA-FTIR (%)
AO ID126 FTIR network
Conditions of comparisons with SCIA data:
Open symbols:Same day; +/- 2.5°lat and +/- 10° lon; cloud-free SCIA pixel ;
Yellow filled symbols:Same day; +/- 2.5°lat and +/- 5° lon; cloud-free SCIA pixel ; altitude w/i +/- 250 m
altitude-normalised data
M. De Mazière et al.
Page 21Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004
Conclusions
Late availability of data has not allowed many nor detailed analyses
Conclusions from available limited (in number and depth) intercomparisons:
Scientific data products are a large improvement upon NRT products and demonstrate the capability of SCIAMACHY to detect variability in CO, CH4 and N2O
Actual performances of wfm-doas and IMLM algorithms are similar –Observed relative differences with GB data (SCIA-GB) are within
-50 → +50 % for CO – overestimation by WFM-DOAS? underestimation by IMLM ? TBC-40 → +40 % for CH4-20 → +60% for N2O (wfm-doas only)
Conservative estimates! Conditions for comparisons need improvement; more statistics are welcome
Page 22Atmospheric Chemistry Validation of ENVISAT – ESRIN - 3-7 May 2004