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Algorithm
The operational SO2 total column products are generated using the algorithm GDP
(GOME Data Processor) version 4.x integrated into the UPAS
(Universal Processor for UV/VIS Atmospheric Spectrometers) processor for generating
level 2 trace gas and cloud products.
GDP 4.x performs a DOAS fit for SO2 slant column followed by an AMF/VCD computation using a single wavelength. Corrections are applied to the slant column for:
GDP 4.x performs a DOAS fit for SO2 slant column followed by an AMF/VCD computation using a single wavelength. Corrections are applied to the slant column for:
• Equatorial offset
• Interference of SO2 and O3 absorption
• SZA dependence
The SO2 column for volcanic eruptions is calculated for 3 different assumed plume heights:
2.5 km, 6 km, 15 km. A description of the SO2 retrieval and validation is given in
[Rix et al. (2009),
Loyola et al. (2008),
Thomas et al. (2005)] .
A description of the tropospheric SO2 algorithm and validation is given in the reference
listed in the GOME-2 documentation pages.• Interference of SO2 and O3 absorption
• SZA dependence
Scientific Papers
- Rix, M., P. Valks, N. Hao, D. Loyola, H. Schlager, H. Huntrieser, J. Flemming, U. Koehler, U. Schumann, A. Inness, Volcanic SO2, BrO and plume height estimations using GOME-2 satellite measurements during the eruption of Eyjafjallajökull in May 2010, Journal of Geophysical Research, vol. 117, D00U19, 2012.
- Rix M., Valks P., Hao N., van Geffen J., Clerbaux C., Clarisse L., Coheur P.-F., Loyola D., Erbertseder T., Zimmer W., and Emmadi S., Satellite Monitoring of Volcanic Sulfur Dioxide Emissions for Early Warning of Volcanic Hazards, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, vol. 2, no. 3, pp. 196-2006, 2009.
- Loyola D., van Geffen J., Valks P., Erbertseder T., Van Roozendael M., Thomas W., Zimmer W., Wißkirchen K., Satellite-based detection of volcanic sulphur dioxide from recent eruptions in Central and South America, Advances in Geosciences, vol. 14, pp. 35-40, 2008.
- Thomas W., Erbertseder T., Ruppert T., Van Roozendael M., Verdebout J., Balis D., Meleti C., and Zerefos C. On the Retrieval of Volcanic Sulfur Dioxide Emissions from GOME Backscatter Measurements, Journal of Atmospheric Chemistry , vol. 50, pp. 295-320, 2005.
Acknowledgments
GDP 4.x for total SO2 retrieval is being developed by scientists from BIRA and DLR
• BIRA: Michel van Roozendael, Jos van Geffen
• DLR: Pieter Valks, Meike Rix, Nan Hao, Diego Loyola, Walter Zimmer, Sunil Emmadi
and is funded by EUMETSAT O3M-SAF and national contributions.
• DLR: Pieter Valks, Meike Rix, Nan Hao, Diego Loyola, Walter Zimmer, Sunil Emmadi
For further information please contact:
Pieter Valks, DLR-IMFE-Mail: Pieter.Valks [at] dlr.de