Affiliation: | 1. Voeikov Main Geophysical Observatory, ul. Karbysheva 7, St. Petersburg, 194018, Russia 2. Physical Meteorological Observatory, World Radiation Center, Dorfstrasse 33, Davos, CH-7260, Switzerland 3. Swiss Federal Institute of Technology, Zurich, Switzerland 4. Arctic and Antarctic Research Institute, ul. Beringa 38, St. Petersburg, 199397, Russia
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