1. Department of Marine Biology and Oceanography, Institute of Marine Sciences (ICM, CSIC), Pg. Marítim de la Barceloneta, 37-49, E-08003 Barcelona, Spain
2. Faculty of Earth Sciences, University of Barcelona, Carrer Martí i Franquès, s/n, E-08028 Barcelona, Spain
3. GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstraße 1−3, 24148 Kiel, Germany
4. Finnish Meteorological Institute, Erik Palménin aukio, 1. 00560 Helsinki, Finland
5. Institute for Atmospheric and Climate Science, ETH Zurich, Universitätstrasse 16, 8092 Zurich, Switzerland
6. The Otto Schmidt Laboratory, Arctic and Antarctic Research Institute, Beringa, 38. 199397 St. Petersburg, Russia
7. École Polytechnique Fédérale de Lausanne, EPFL, CH-1015 Lausanne, Switzerland