TY JOUR TI Data analysis for variational assimilation of the surface temperature of the Black and Azov Seas KW Data analysis; observation data; data errors; variational assimilation; sea surface temperature; optimality system. JO Russian Journal of Earth Sciences AU Zakharova, N.B. AU Parmuzin, E.I. PY 2022 IS 21 PB Geophysical Center of the Russian Academy of Sciences