rithms of the
-model of ocean general circulation developed at the INM RAS. The model is supplied with a block for calculating sea ice thermodynamics. In order to eliminate the sources of instability and noise gener-
ation related to the converging meridians at the North Pole, rotation of the spherical coordinate system is per-
formed, so that the poles of the new system appeared at the geographical equator beyond the integration
domain. This allowed us to adequately reproduce the fields of the ocean characteristics without critical reduc-
tion of the model time steps. The results of the modeling are compared with the observations. An analysis of
climatic seasonal evolution of the circulation, thermohaline fields, and ice characteristics in the Atlantic and
Arctic regions is given, as well as the results of the modeling in the transition area between them located in the
Norwegian and Greenland seas. It is shown that the model realistically reproduces the particularities of the
dynamical and thermohaline fields of the ocean, the winter intensification of the Gulf Stream, the vertical veloc-
ity inversion in its core, the highly saline tongue of the Mediterranean waters in the intermediate layers of the
Atlantic, the particularities of the circulation in the surface fresh water mass of the Arctic Ocean, the basic char-
acteristics of the warm and saline Atlantic waters penetrating into the Arctic Ocean, the basic features of the
exchange between the Atlantic and Arctic oceans, and other known features of the oceanic fields and their sea-
sonal evolution. The model is intended to study how the set of exchanges between the Atlantic and Arctic oceans
influences the modes of spatiotemporal variability of the North Atlantic dynamical and hydrological fields on
scales from years to decades.