This work has benefited from numerous interactions amongst the LADCP user group (http://www.ldeo.columbia.edu/∼visbeck/ladcp) in particular Juergen Fischer, Christian Mertens, Gerd Krahmann, Bruce Huber, Lee Gordon, Brian King, and Dan Torres. Brian King has kindly provided some bottom-track LADCP profiles. The first version of the manuscript was prepared during a 3-month-long visit at CSIRO, Hobart (winter 1998/99). I am in debt to Trevor McDougall for his hospitality and stimulating discussions as well as to Peter MacIntosh for providing me with a fast MATLAB based solver for linear equations. Two anonymous reviewers provided helpful suggestions that improved the manuscript.
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