Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

Expected Validation of

Envisat Ozone Data

Expected Validation of

Envisat Ozone Data

E. HilsenrathNASA Goddard Space Flight Center

B. BojkovG. LabowScience Systems and Applications

Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

OutlineOutline

• Level 1 (radiance) validation– Satellite and ground

• Ozone Level 2 (column and profiles) validation– Satellite: SOLSE-2, SBUV/2, TOMS– Ground based: GSFC and Mauna Loa

• Results and Plans

1980 1990 2000 2010 2020

Year

280

290

300

310

Ozon

e (D

obso

n Un

its)

Nimbus 7 TOMS

Meteor TOMS

Earth Probe TOMS

recovery predicted by model

Global average ozone measured by TOMS compared with Model

eruption of Mt. Pinatubo65N - 65S

version 8 TOMS data

Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

Level 1 (Radiance) Validation-1Level 1 (Radiance) Validation-1

• Radiative transfer calculations to compare radiances

• Compute radiance from satellite profiles correcting for lighting conditions– Successfully employed SBUV/2 for GOME

(Hilsenrath, et al., 1996)– Three operational SBUV/2s in orbit– Similar to R. van der A (2001) for GOME– Will include Ring effect– Most applicable to profile channels

• Results– Limited SCIAMACHY Level 1b data

available

Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

Level 1 (Radiance) Validation-2Level 1 (Radiance) Validation-2

• Ground based validation of “radiances”, 300-400 nm

– Radiative transfer models show direct comparisons can be made irrespective of ozone and aerosol columns

– TOMS, SBUV/2, GOME, SCIAMACHY can be validated independent of algorithm.

– System undergoing test at GSFC using SSBUV instrument

• Results– No Level 1b data available over GSFC

Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

Space Shuttle (SOLSE) comparisonSpace Shuttle (SOLSE) comparison

• SOLSE Space Shuttle payload

– Test limb scattering technique

– Entire limb imaged on detector

– SOLSE-1 in 1997 gave limited data but good results

– SOLSE algorithm employed by SCIAMACHY and OSIRIS

• Results (SOLSE-2)

– Mission delayed to Jan 2003

Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

Mauna Loa Intercomparison CampaignMauna Loa Intercomparison Campaign

• NDSC sponsored campaign :– Ozone sondes– Microwave sounder– Three lidars– August 5-21, 2002

• Results– No profiles from SCIAMACY– No profiles from MIPAS– Limited profiles from GOMOS (ACRI)

1011 1012

ozone number density (/cm3)

0

10

20

30

40

50

altit

ude

(km

)

August 11, 2002

JPL lidarGSFC lidarballoonmicrow ave

Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

Total Ozone Column IntercomparisonTotal Ozone Column Intercomparison

• GSFC/Brewer comparisons– GSFC maintains highly calibrated

double Brewer for research and TOMS validation

– Aerosol and trace gas measurements

– Difference with TOMS is 3% rms

• Results– Very limited overpasses over GSFC

– Large biases observed

Scia. TOZ(+/-15 deg)

stddevScia. TOZ(+/-5 deg)

stddev Brewer TOZDiff

(S-B)2002 10 28 264.3 5.3 243.8 4.5 279.0 35.22002 10 28 234.7 10.7 - - 279.02002 11 04 220.5 2.3 220.4 2.2 291.2 70.82002 11 06 283.6 4.0 - - 283.42002 11 07 280.1 7.4 298.0 2.2 323.5 25.52002 11 16 306.2 7.5 - - 278.02002 11 17 309.1 23.7 276.3 9.5 262.3 -14.02002 11 22 287.9 15.6 - - 294.02002 11 23 280.4 3.2 282.5 4.1 297.6 15.1

Date

Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

SBUV/2 – SCIAMACHY total ozone comparisonsSBUV/2 – SCIAMACHY total ozone comparisons

• Meteo Lv2, version 3.53

• << 12 hours

• SCIA scene inside SBUV/2

SBUV/2 (N16) – SCIA (UV Window)958 Matchups 10/25-31 2002

Validation by Model Assimilation/Satellite Intercomparison - ESRIN 9–13 December 2002

SBUV/2 – SCIAMACHY total ozone comparisons SBUV/2 – SCIAMACHY total ozone comparisons