TY JOUR TI Comparative analysis of the first baroclinic Rossby radius in the Baltic, Black, Okhotsk, and Mediterranean seas KW Vertical eigenvalue problem KW seawater density stratification KW long linear internal wave phase speed KW first baroclinic Rossby radius of deformation KW seasonal variability JO Russian Journal of Earth Sciences AU Kurkin, A.. AU Kurkina, O.. AU Rybin, A.. AU Talipova, T.. PY 2020 IS 20 PB Geophysical Center of the Russian Academy of Sciences