1. a Marine and Environmental Sciences Center, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Lisbon, Portugal
2. b Departamento de Engenharia Geográfica, Geofísica e Energia, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Lisbon, Portugal
3. c Department of Oceanography, St. Petersburg State University, St. Petersburg, Russia
4. d Nansen International Environmental and Remote Sensing Centre, St. Petersburg, Russia
5. e Marine Hydrophysical Institute of Russian Academy of Sciences, Sebastopol, Russia