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CLARA-A1: A cloud, albedo, and radiation dataset from 28 yr of global AVHRR data

by K. G. Karlsson, A. Riihelä, R. Müller, J. F. Meirink, J. Sedlar, M. Stengel, M. Lockhoff, J. Trentmann, F. Kaspar, R. Hollmann, E. Wolters show all authors
Atmospheric Chemistry and Physics ()


A new satellite-derived climate dataset - denoted {CLARA-A1} ({"The} {CM} {SAF} {cLoud}, Albedo and {RAdiation} dataset from {AVHRR} data") - is described. The dataset covers the 28 yr period from 1982 until 2009 and consists of cloud, surface albedo, and radiation budget products derived from the {AVHRR} (Advanced Very High Resolution Radiometer) sensor carried by polar-orbiting operational meteorological satellites. Its content, anticipated accuracies, limitations, and potential applications are described. The dataset is produced by the {EUMETSAT} Climate Monitoring Satellite Application Facility ({CM} {SAF)} project.{\textbar}The dataset has its strengths in the long duration, its foundation upon a homogenized {AVHRR} radiance data record, and in some unique features, e. g. the availability of 28 yr of summer surface albedo and cloudiness parameters over the polar regions. Quality characteristics are also well investigated and particularly useful results can be found over the tropics, mid to high latitudes and over nearly all oceanic areas.{\textbar}Being the first {CM} {SAF} dataset of its kind, an intensive evaluation of the quality of the datasets was performed and major findings with regard to merits and shortcomings of the datasets are reported. However, the {CM} {SAF's} long-term commitment to perform two additional reprocessing events within the time frame 2013-2018 will allow proper handling of limitations as well as upgrading the dataset with new features (e. g. uncertainty estimates) and extension of the temporal coverage.

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