CLARA-SAL: a global 28 yr timeseries of Earth's black-sky surface albedo 1Finnish Meteorological Institute, P.O. Box 503, 00101 Helsinki, Finland
10 Apr 2013
2VTT Technical Research Center of Finland, Espoo, Finland
3Deutscher Wetterdienst, Offenbach, Germany
Received: 10 July 2012 – Published in Atmos. Chem. Phys. Discuss.: 26 September 2012 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.
Revised: 08 March 2013 – Accepted: 15 March 2013 – Published: 10 April 2013
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., 13, 3743-3762, doi:10.5194/acp-13-3743-2013, 2013.