TY JOUR TI Seasonal variability of the potential vorticity in the Lofoten vortex KW North Atlantic KW Norwegian sea KW Lofoten basin KW Lofoten vortex KW potential vorticity KW relative vorticity JO Russian Journal of Earth Sciences AU Novoselova, E.. PY 2022 IS 22 PB Geophysical Center of the Russian Academy of Sciences