ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

SCIAMACHY H2O column

Renske TimmermansKNMI

Contributions from:Stefan Noël (IFE-Bremen)Rüdiger Lang (MPI-Mainz)

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

SCIAMACHY H2O column

Operational product/algorithm not mature enough for validation (ice problem channels 7&8)

Scientific products:IFE Bremen - Stefan Noel, channel 4MPI-Mainz - Rüdiger Lang , channel 3/4 SRON - Ahilleas Maurellis , channel 8Uni Heidelberg - Thomas Wagner, channel 4

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

SCIAMACHY H2O column

Operational product/algorithm not mature enough for validation (ice problem channels 7&8)

Scientific products:IFE Bremen - Stefan Noel, channel 4MPI-Mainz - Rüdiger Lang , channel 3/4 SRON - Ahilleas Maurellis , channel 8Uni Heidelberg - Thomas Wagner, channel 4

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

IFE-Bremen - H2O (AMC-DOAS) validation with integrated sondes

Same day < 1000 kmData from 17 stations from NILU CALVAL database

The SCIAMACHY validation reference set July to December 2002

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

Legionowo, Poland (52.2; 20.6)

0.00E+00

2.00E+22

4.00E+22

6.00E+22

8.00E+22

1.00E+23

1.20E+23

1.40E+23

1.60E+23

3-Jul-02 23-Jul-02 12-Aug-02 1-Sep-02 21-Sep-02 11-Oct-02 31-Oct-02 20-Nov-02 10-Dec-02

Date

H2O

[mol

ec/c

m2]

vcd sondes vcd noel

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

SCIA-sondes Legionowo

-100.00

-50.00

0.00

50.00

100.00

150.00

3-Jul-02 23-Jul-02 12-Aug-02 1-Sep-02 21-Sep-02 11-Oct-02 31-Oct-02 20-Nov-02 10-Dec-02

Date

diffe

renc

e [%

]Mean diff: -14.9 %St. dev: 37.9 %

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

SCIA-sondes Legionowo

-100.00

-50.00

0.00

50.00

100.00

150.00

0 100 200 300 400 500 600 700 800 900 1000

distance

diffe

renc

e [%

]

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

Jokioinen (60.8; 23.5)

0

2E+22

4E+22

6E+22

8E+22

1E+23

1.2E+23

3-Jul-02 23-Jul-02 12-Aug-02 1-Sep-02 21-Sep-02 11-Oct-02 31-Oct-02 20-Nov-02 10-Dec-02

Date

H2O

[mol

ec./c

m2]

noel vcdvcd sondes

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

SCIA-sondes Jokioinen

-80.00

-60.00

-40.00

-20.00

0.00

20.00

40.00

60.00

80.00

100.00

120.00

0 200 400 600 800 1000 1200

Distance

diffe

renc

e [%

]Mean diff: 0.17 %St. dev: 34.9 %

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

IFE H2O vs sondes conclusion

7 stations with more 20 colocations (46N-68N)Mean difference SCIA-sondes: -10.8%Mean standard deviation: 34.6

All 17 stations (78S-79N)Mean difference SCIA-sondes: -6.6%

Large scatter probably caused by large temporal and spatial variability of H2O

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

IFE-Bremen - H2O (AMC-DOAS) validation with ATOVS

Same day < 200 kmClosest colocation

The SCIAMACHY validation reference set July to December 2002

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

IFE H2O vs ATOVS

mean diff. st. dev.

All sza -15.8 % 41.5%

< 30° -5.3% 23.4%30°-60 ° -15.2% 31.9%> 60° -16.9% 48.2%

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

IFE-Bremen - H2O (AMC-DOAS) validation with SSM/I and ECMWF

These results are in agreement with previous validation of the IFE H2O (not based on the SCIA val. ref. set) with SSM/I and ECMWF data:

Systematic offset of 10%, SCIA is lower, also seen by theWFM-DOAS method (from Michael Buchwitz), which indicates that thisis a systematic effect and probably not related to the algorithm.Possible reasons are:* calibration errors* insufficient knowledge of slit function* potential errors in spectral data base (cross sections)* systematic effects of clouds and/or surface albedoScatter of about 1.66E22 molec/cm2

POSTER from S. Noel

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

SCIAMACHY H2O column

Operational product/algorithm not mature enough for validation (ice problem channels 7&8)

Scientific products:IFE Bremen - Stefan Noel, channel 4MPI-Mainz - Rüdiger Lang , channel 3/4 SRON - Ahilleas Maurellis , channel 8Uni Heidelberg - Thomas Wagner, channel 4

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

Problem: Sunspectrum at 590 to 605 nm

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

SCIA

ECMWF (ERA)Comparison of TWVC between ECMWF and SCIA July 2002 to August 2002, 640 nm band

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

Comparison of TWVC between Radiosondes and SCIAAugust 2002, 640 nm band

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

Conclusion

IFE H2O : -10 to –15 % offset compared to radiosondes and ATOVS

MPI/SRON H2O: -20 to –25% offset compared to radiosondes and ECMWF

ACVE-2 – ESRIN - 3-7 May 2004 – SCIAMACHY H2O columns

Thanks to:

Stefan Noël (IFE-Bremen) and Rüdiger Lang (MPI-Mainz) for the provision of non-operational data

Sonde data providers on NILU CALVAL database