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EXPLOITATION OF THE MERIS O2 ABSORPTION BAND

Rene Preusker(1), Rasmus Lindstrot(1) and J├╝rgen Fischer(1)

(1) FU Berlin, Carl-Heinrich_Becker-Weg 6-10, 12165 Berlin, Germany

Abstract

The utilisation of spectral measurements within the oxygen absorption bands for observations of the earth and atmosphere from space started in the early sixties with the aim to monitor geophysical properties such as cloud top and surface pressure from satellites. Due to problems in satellite instrumentation as well as in radiative transfer modelling, the interpretation of the measured signals did not meet all expectations. MERIS has a distinct channel at 761 nm with a spectral width of 3.75 nm to measure the backscattered radiation of the R-branch of the O2 A-band. Although the cloud top pressure of stratocumulus clouds are detectable with a validated accuracy of 200 m, several features of the MERIS O2 measurements are not well understood.

In the framework of an ESA project we performed:

- A comparison of two independend forward models which simulate the absorption process in the O2 absorption bands

- A sensitivity analysis and a selection of algorithms to enhance the land surface and cloud top pressure operational L2 products

- A Sensitivity analysis and a proposition of algorithms for the retrieval of geophysical and instrument parameters in clear sky oceanic observational conditions, using the nominal MERIS band setting

- A Sensitivity analysis and a proposition of algorithms for the retrieval of geophysical and instrument parameters using non nominal MERIS band settings.

The current state of the project, in particular the results of the sensitivity studies will be presented.

This work was supported under ESA/ESRIN/AO/1-5161/07/I-OL.

 

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry