Operational Near Real-Time Derivation of Land Surface Albedo and Down-Welling Short-Wave Radiation from MSG Observations

Details Operational Near Real-Time Derivation of Land Surface Albedo and Down-Welling Short-Wave Radiation from MSG Observations Operational Near Real-Time Derivation of Land Surface Albedo and Down-Welling Short-Wave Radiation from MSG Observations

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.582..143g&link_type=abstract

Proceedings of the Second MSG RAO Workshop (ESA SP-582). Salzburg, Austria, 9 - 10 September 2004. Organised by ESA, in cooperat

Physics

1

Scientific paper

In the framework of the EUMETSAT Satellite Applica- tion Facility for Land Surface Analysis (Land-SAF) we develop surface albedo and short-wave radiation products which will be generated in near real-time from observa- tions provided by the MSG/SEVIRI instrument. The albedo algorithm exploits the diurnal variation of the illumination angle, which provides information on the angular variation of reflectance, in order to invert a lin- ear kernel-based bi-directional reflectance model. Sev- eral albedo variants are derived by adequately integrating the constrained model functions. In the case of poor an- gular sampling the achievable accuracy needs to be aug- mented by additional information, e.g. by using a static a priori information data base derived from measurements of instruments with multiple view angle capabilities. The down-welling short-wave radiation at the surface es- sentially depends on cloud cover and hence to derive a reliable estimate of this quantity the cloud mask repre- sents an important piece of information. Depending on the presence of clouds and potentially on cloud type dif- ferent physically based parameterisation schemes are ap- plied to approximate the radiative transfer problem. Key words: Meteosat Second Generation; Land Surface Albedo; Down-welling Radiation.

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