We would like to express our gratitude to Jürgen Sellschopp of the SACLANTCEN, La Spezia, Italy; to Heinz-Volker Fiekas of the “Forschungsanstalt der Bundeswehr für Wasserschall- und Geophysik,” Kiel, Germany; and to Detlef Quadfasel of the Institute of Oceanography of the University of Hamburg, Germany. Their efforts made possible the realization of the in situ measurements. We thank Werner Alpers and Nataliya Stashchuk for helpful discussions, Marcus Dengler for processing of the ADCP data, and the captain and crew of the NRV Alliance of the SACLANTCEN for their support during the experimental phase of this study. This work was partly supported by the European Commission under Contract MAS3-CT95-0027 and by the Deutsche Forschungsgemeinschaft in the frame of the Sonderforschungsbereich 1626.
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