Field data indicate that a well-marked cyclonic gyre affecting the water column from the surface to the bottom is present in the northern Tyrrhenian Sea in both summer and winter. The gyre undergoes significant seasonal changes in both shape and size. Following the indications of past studies, a numerical quasi-geostrophic model driven by the wind jet blowing from the Strait of Bonifacio was able to reproduce the principal gyre characteristics. However, the wind jet alone does not explain all the gyre features, especially its seasonal variation. These variations are probably linked to the seasonal variability of the northward surface current flowing along the eastern boundary of the Tyrrhenian Sea. -from Authors

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