Institution: | (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 |