Calculation and Analysis of the Average for Seasons Fields of the Currents Velocities of the Marmara Sea Waters

Abstract

Using a numerical three-dimensional non-linear thermohydrodynamic model of MHI, an experiment by simulate of the circulation of the waters of the Sea of Marmara on the example of 2008 was conducted. As a result of the calculation, three-dimensional fields of hydrodynamic characteristics were obtained for every day of the year for the entire basin. The analysis of the average seasonal distributions of the velocity fields of the currents of the sea water at different horizons is carried out. It was found that in the surface layer in winter, when the waters move from the Bosphorus to the Dardanelles, in the northwestern part of the basin there is an anticyclone, while in the south the movement with cyclonic vorticity prevails. In the spring hydrological season the extensive anticyclonic vortex is formed in the center of the basin, which is intensified in summer. In the autumn, the central anticyclone weakens and its area decreases, and the cyclonic vortex forms in the southeastern region of the sea. The such location of dynamic features in the surface layer of the sea mainly depends on the distribution of the average seasonal vorticities of the wind field over the region and the orography of the coastline. The regularities of water behavior below the density jump are mainly determined by atmospheric influence, the impulse flow through the straits and the bottom topography. At depths below 500 m, the seasonal signal in the velocity fields is traced weakly. The movement of waters at these depths is concentrated in three deep-water basins. In the western and central deep-water regions there are cyclonic eddies, in the east—the system of anticyclone and cyclone.