Mizyuk A. Elaboration of the reanalysis of the Black Sea hydrophysical fields by means of temperature and salinity data assimilation into models

The thesis is devoted to implementation of retrospective analysis of the hydrophysical fields based on assimilation of temperature and salinity observations into the circulation models. Reanlysis was fulfilled using measurements in 1971-1993 in the sigma-cooridnate circulation model by means of algorithm of adaptive statistics. Distribution of forecast error variances of temperature and salinity in the mixed layer is governed by vertical turbulent diffusion. The results of reanalysis allowed to estimate trends of horizon-averaged temperature and salinity. Reanalysis is carried out with the use of adaptive statistics and its simplified variant within z-cooridnate model. Optimal weights in the assimilation sources were established using the fields of "typical" forecast error variances. Carrying out of reanalysis with these estimations allowed to reconstruct the dinamicaly adjusted hydrophysical fields. It was obtained that values of yearly averaged vertical velocity correlate with values of kinetic energy of currents. The fields reconstructed allowed to study also peculiarities of cold intermediate layer formation. The method of reconstruction of the hydrophysical fields based on the irregular temperature and salinity profiles and satellite altimetry is proposed. The procedure of producing of the temperature and salinity pseudoobservations was elaborated and verified. The reanalysis of the hydrophysical fields in the 2007-2008 was carried out by means of the procedure and observastions of profiling floats.