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Abstract <p>Based on the analysis of the simulation results of wind-driven ocean circulation in an idealized two-layer basin simulating the North Atlantic, one of the possible mechanisms for generating the Atlantic Multidecadal Oscillation (AMO) is discussed. It is shown that at a certain ratio between the realistic intensity of stationary wind action and energy dissipation, a quasi-periodic circulation regime is formed in the ocean with a period close to the AMO period. The reason for the formation of such a regime is the sporadic instability of large-scale ocean currents (formed primarily at the boundary between the gyres), leading to the formation of a field of mesoscale vortices. As a result of the self-organization of these vortices, the jet character of the currents separating the gyres is then restored and the described dynamic cycle repeats.</p>

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On the Generating Mechanism of the Atlantic Multidecadal Oscillation

  • 期刊论文

  • 发表日期：

    2026年4月30日

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  • A. B. Polonsky,
  • A. B. Fedotov

摘要

Abstract

Based on the analysis of the simulation results of wind-driven ocean circulation in an idealized two-layer basin simulating the North Atlantic, one of the possible mechanisms for generating the Atlantic Multidecadal Oscillation (AMO) is discussed. It is shown that at a certain ratio between the realistic intensity of stationary wind action and energy dissipation, a quasi-periodic circulation regime is formed in the ocean with a period close to the AMO period. The reason for the formation of such a regime is the sporadic instability of large-scale ocean currents (formed primarily at the boundary between the gyres), leading to the formation of a field of mesoscale vortices. As a result of the self-organization of these vortices, the jet character of the currents separating the gyres is then restored and the described dynamic cycle repeats.