1. a Institute of Environmental Physics, University of Bremen , O. Hahn Allee 1, D-28334 , Bremen , Germany
2. b Meteorological Research Institute , 1-1 Nagamine, Tsukuba , Ibaraki , 305-0052 , Japan
3. c Department of Geography , University of Zurich , Winterthurerstrasse 190, CH-8057 , Zürich , Switzerland
4. d Carsten, Brockmann Consult , Max-Planck-Str. 2, D-21502 , Geesthacht , Germany
5. e Mission Science Division (EOP-SME), European Space Agency, ESTEC Earth Observation Programmes , Postbus 299, 2200 , AG , Noordwijk , The Netherlands
6. f Earth Observation Research Centre, Japan Aerospace Exploration Agency , 2-1-1, Sengen, Tsukuba , Ibaraki , 305-8505 , Japan