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Homogeneous, quality controlled time series of GOME columns of NO2, BrO, and OClO

GOME is one of several instruments aboard the European research satellite ERS-2 (Burrows et al., 1999). It consists of a set of four spectrometers that simultaneously measure sunlight reflected from the earth’s atmosphere and surface in four spectral windows covering the wavelength range between 240nm and 790nm with moderate spectral resolution (0.2 - 0.4 nm).

The satellite operates in a nearly polar, sun-synchronous orbit at an altitude of 780 km with a local equator crossing time at approximately 10:30 local time. While the satellite orbits in an almost north-south direction the GOME instrument sweeps in the perpendicular east west direction. During one sweep, three individual spectral scans are performed. The corresponding three ground pixels covering an area of 320 km (eastwest) by 40km (north-south) lie side by side (a western, a center and an eastern pixel). The Earth’s surface is totally covered within three days, and polewards from about 70° latitude within one day.

From the raw spectra measured by GOME, the slant column density (SCD) is determined using the Differential Optical Absorption Spectroscopy (DOAS) technique [Platt, 1994]. From the inferred differential absorption and knowledge of the absorption cross sections, the SCD of the QUILT-relevant trace species (O3, NO2, BrO and OClO) can be determined.

Work on historical satellite data at University of Bremen, University of Heidelberg and BIRA-IASB focused on the homogenisation of the GOME NO2, OClO and BrO time series.

Satellite data dissemination:
The consolidated GOME BrO data produced at BIRA-IASB - at global scale and extracted for the QUILT stations (200 km radius overpasses) - can be downloaded in ASCII format from Consolidated NO2, BrO and OClO data retrieved using scientific algorithms from the University of Bremen and the University of Heidelberg can be obtained on the following web-sites:; and

In addition, GOME NO2 data extracted at the University of Bremen for all QUILT stations can be downloaded in ASCII format from http//

In order to assess the reliability of the consolidated data sets, comparisons of the GOME NO2 and BrO columns with ground-based measurements have been performed by the Bremen University and BIRA-IASB for several stations of the QUILT network.

More information on the QUILT project can be found at:

Informations connexes

Reported by

Institute of Environmental Physics, University of Bremen
Otto-Hahn-Allee 1
28359 Bremen
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