Products » Nitrogen Dioxide total column (NO2)


The operational NO2 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.
The total NO2 column is retrieved from GOME solar backscattered measurements in the visible wavelength region (425-450 nm), using the Differential Optical Absorption Spectroscopy (DOAS) method.
A description of the total NO2 algorithm and validation is given in the reference documents listed in the GOME documentation and GOME-2 documentation pages.
The GDP 4.0 algorithm [Van Roozendael et al. (2006)] became operational for GOME/ERS-2 in 2004 after an independent geophysical validation [Balis et al. (2006)]. Further algorithm development was performed in the framework of EUMETSAT O3M-SAF where GDP 4.x for NO2 [Valks et al. (2011)]. is the current operational algorithm for GOME-2/MetOp-A.


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


GDP 4.x for total and tropospheric NO2 retrieval is being developed by scientists from DLR, IUP (Univ. of Bremen) and BIRA and is funded by ESA, EUMETSAT O3M-SAF and national contributions.
Contributors to the NO2 algorithm for GOME and GOME-2 are:
• BIRA: Michel Van Roozendael, Jean-Christopher Lambert, Gaia Pinardi
• DLR: Pieter Valks, Diego Loyola, Nan Hao, Walter Zimmer, Sunil Kumar Emmadi
• IUP: Hendrik Nüss, Andreas Richter

For further information please contact:

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

DLR IMF AP Copyright © 2010 | Imprint