Trace Gas Performance of Sentinel 4 UVN on Meteosat Third Generation
Heinrich Bovensmann(1), Stefan Noel(1), Klaus Bramstedt(1), Patricia Liebing(1), Andreas Richter(1), Vladimir Rozanov(1), Marco Vountas(1) and John P. Burrows(1)
(1) University of Bremen, FB1, PO Box 330440, D-28334 Bremen, Germany
The Sentinel 4 UVN instrument is an UV-VIS-NIR imaging spectrometer and part of the geostationary Meteosat Third Generation (MTG) satellite to be launched in 2017/18. UVN is designed to make measurements of the up welling radiation at the top of the atmosphere. It is designed to yield the total and tropospheric columns of several atmospheric constituents of great significance to air pollution and air quality: the gases Ozone O3, Nitrogen Dioxide, NO2, Sulphur Dioxide, SO2, and Formaldehyde HCHO. In addition, there is the potential to deliver Glyoxal (CHOCHO). Furthermore, aerosol information shall be obtained. A sensitivity study has been performed to link sensor requirements and parameters to the Level 2 data quality. For this purpose, an end-to-end simulation and retrieval chain has been be set-up, consisting of:
• A forward radiative transfer model (RTM) simulating the TOA radiances, using geophysical scenarios as input. The RTM is also used to generate spectrally high resolution reference spectra and to address polarisation effects.
• An instrument and calibration model simulating measured irradiance, radiance and reflectance taking into account instrument and calibration characteristics as defined in the Mission Requirements Document and updates provided by ESA.
• An optimal estimation retrieval scheme deriving the relevant geophysical parameters (total and tropospheric columns) from the simulated reflectance and relevant error characteristics.
With this system, an error analysis has been performed. In this paper the results obtained about the resultant Sentinel 4 UVN performance for trace gas column amounts will be presented and discussed.