Atmos. Chem. Phys. Discuss., 12, 25573-25615, 2012
© Author(s) 2012. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
CLARA-SAL: a global 28-yr timeseries of Earth's black-sky surface albedo
A. Riihelä1, T. Manninen1, V. Laine1, K. Andersson2, and F. Kaspar3
1Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
2VTT Technical Research Center of Finland, Espoo, Finland
3Deutscher Wetterdienst, Offenbach, Germany

Abstract. We present a novel 28-yr dataset of Earth's black-sky surface albedo, derived from AVHRR instruments. The dataset is created using algorithms to separately derive the surface albedo for different land use areas globally. Snow, sea ice, open water and vegetation are all treated independently. The product features corrections for the atmospheric effect in satellite-observed surface radiances, a BRDF correction for the anisotropic reflectance properties of natural surfaces, and a novel topography correction of geolocation and radiometric accuracy of surface reflectance observations over mountainous areas. The dataset is based on a homogenized AVHRR radiance timeseries. The product is validated against quality-controlled in situ observations of clear-sky surface albedo at various BSRN sites around the world. Snow and ice albedo retrieval validation is given particular attention using BSRN sites over Antarctica, Greenland Climate Network stations on the Greenland Ice Sheet (GrIS), as well as sea ice albedo data from the SHEBA and Tara expeditions. The product quality is found to be comparable to other previous long-term surface albedo datasets from AVHRR.

Citation: Riihelä, A., Manninen, T., Laine, V., Andersson, K., and Kaspar, F.: CLARA-SAL: a global 28-yr timeseries of Earth's black-sky surface albedo, Atmos. Chem. Phys. Discuss., 12, 25573-25615, doi:10.5194/acpd-12-25573-2012, 2012.
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