Investigation of the evolution of jet zonal wind flow using artificial sources and drains of vorticity

by

A.B. Fedotov

Institute of Natural and Technical Systems,

RF, Sevastopol, Lenin St., 28

DOI: 10.33075/2220-5861-2024-1-30-34

UDC 551.465.553                                                      

EDN: https://elibrary.ru/dizlvd

Within the framework of a numerical model of a two-layer ocean with a depth of layers corresponding to average oceanic conditions, a study of the wind evolution of a large-scale circulation, taking into account the real geographical features of the water area under consideration, using the example of the North Atlantic. The main attention is paid to the change in the zonal extent of the North Atlantic water area depending on the geographical latitude. The actual solution of the system of equations describing large-scale circulation is carried out in a square computational domain, while the use of artificial sources and effluents of relative vorticity allows us to take into account the real geography of the water area. The negative vorticity drain is formed near the western shore of the calculated area, and the source is algorithmically organized through a uniform redistribution of the remote negative vorticity throughout the rest of the calculated area, in which the vorticity is negative, so that the total amount of vorticity of both signs remains unchanged. The eastward reversal of the jet stream occurs at the same latitude where the formation of the jet stream was located in traditional numerical modeling, namely, at the latitude at which the sign of the vorticity wind flow changes from cyclonic to anticyclonic.

Кeywords: synoptic variability, large-scale variability, wind-forced currents, vortices.

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