Products » Sulfur Dioxide total column (SO2)





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:
• 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.
Remark: In the region of the Southern Atlantic Anomaly (SAA), the GOME-2 satellite instrument is subject to an increased particle flux which creates spurious signals in individual detectors resulting in a reduced quality of the retrieved GOME-2 trace gas columns, i.e. increased scatter in trace gas columns over South America and the Southern Atlantic.

Scientific Papers



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.


For further information please contact:

Pieter Valks, DLR-IMF
E-Mail: Pieter.Valks [at] dlr.de

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