Atmos. Chem. Phys. Discuss., 13, 935-982, 2013
www.atmos-chem-phys-discuss.net/13/935/2013/
doi:10.5194/acpd-13-935-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
Review Status
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-A1: the CM SAF cloud, albedo and radiation dataset from 28 yr of global AVHRR data
K.-G. Karlsson1, A. Riihelä2, R. Müller3, J. F. Meirink4, J. Sedlar1, M. Stengel3, M. Lockhoff3, J. Trentmann3, F. Kaspar3, R. Hollmann3, and E. Wolters4,*
1Swedish Meteorological and Hydrological Institute (SMHI), Norrköping, Sweden
2Finnish Meteorological Institute (FMI), Helsinki, Finland
3Deutscher Wetterdienst (DWD), Offenbach, Germany
4Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands
*now at: HKV Consultants, Lelystad, The Netherlands

Abstract. 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.

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.

Being the first CM SAF dataset of its kind, an intensive evaluation of the quality of the datasets was performed and major findings wrt. 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 2013–2017 will allow a proper handling of limitations as well as upgrading the dataset with new features (e.g. uncertainty estimates) and extension of the temporal coverage.


Citation: Karlsson, K.-G., Riihelä, A., Müller, R., Meirink, J. F., Sedlar, J., Stengel, M., Lockhoff, M., Trentmann, J., Kaspar, F., Hollmann, R., and Wolters, E.: CLARA-A1: the CM SAF cloud, albedo and radiation dataset from 28 yr of global AVHRR data, Atmos. Chem. Phys. Discuss., 13, 935-982, doi:10.5194/acpd-13-935-2013, 2013.
 
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