The authors wish to thank Sonia Bauer, who kindly provided the code for the flow decomposition utilizing the bicubic spline technique. Thanks also to Alessio Bellucci, who did some preliminary work on the Lagrangian measurements, and to Donatella Faggioli, who helped retrieve the bathymetric data. Support from the Office of Naval Research under Contracts N00014-97-1-0620 (A. Griffa) and N0001499WR30014 (P.-M. Poulain), from the European Social Fund (objective 1), from the Italian Ministry of Scientific and Technological Research, and from the Italian National Research Council is gratefully acknowledged.
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