OMI-ASAP - Validaton of Ozone Monitoring Instrument (OMI) Ground UV Products

Good quality UV maps are only achievable by using satellite information and satellite data. The present project deals with the validation of the UV products retrieved by the Ozone Monitoring Instrument (OMI) instrument on board of NASA/EOS AURA satellite. The project is closely connected to the ESA project (ID 2945) “Validation of OMI products over Europe with ground-based UV instruments”.

Short Description

4 work packages (WP) are identified within the scope of the project:

WP1: The UV maps over Europe are validated using the ground- based UV network consisting of several stations. Comparisons at these locations are performed on a routine basis by the owners of the instruments themselves. From these investigations, first statements about the accuracy of the OMI ground UV determination were made. This was done for Austria within the scope of the present project.

Within the scope of WP2 campaigns with additional measure - ments were performed in Vienna and its surrounding in May 2007 and in Insbruck and its surrounding from February to March 2008. Measurements were performed with 5 similar portable broadband detectors at 5 stations within the OMI footprint scale in Vienna and its surroundings. The representativness of one value for one pixel as well as the subpixel variability were investigated. In Innsbruck and surroundings measurements of ground UV, as well as aerosol characteristics were performed. Special emphasis was put on the investigation of the effect of the topography on the ground UV and UV satellite retrieval.

In WP3 special studies and analysis of the data were performed to investigate UV retrieval errors due to the influence of the tropospheric gases ozone, SO 2 , NO 2 and of aerosols. In order to investigate and analyse/specify the effect of different pollutants and aerosols on UV irradiance, ground based measurements of environmental monitoring networks as well as aerosol parameters from the aerosol monitoring network AERONET were used as input parameters for radiative transfer simulations.

WP4: Using the campaign data and also additional measurements in the Viennese area and in the vicinity of Sonnblick observatory, the influence of regional inhomogeneity on UV retrieval and the question of the representativeness of one pixel value are addressed. Special attention is paid to (i) the influence of topography within one pixel, (ii) the influence of different ground albedo and ground structure.

Project Partners


University of Applied Life Sciences and Natural Ressources - Prof. Philipp Weihs


  • University of Graz, Institute of Geophysics, Astrophysics und Meteorology, Austria - Dr. Erich Putz
  • Medical University of Innsbruck, Biomedical Physics, Austria - Prof. Mario Blumthaler

Contact Address

University of Applied Life Sciences and Natural Ressources
Prof. Philipp Weihs
Peter Jordan Straße 82
A-1190 Vienna