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Hybrid Rossby-shelf modes in a laboratory Onno Bokhove

Summary: Hybrid Rossby-shelf modes in a laboratory
Onno Bokhove
and Vijaya Ambati
Department of Applied Mathematics, Univ. of Twente, Enschede, The Netherlands

Corresponding author address: Onno Bokhove, Department of Applied Mathematics --Institute of Me-
chanics, Processes, and Control, Twente-- University of Twente, Enschede, P.O. Box 217, The Netherlands.
E-mail: o.bokhove@math.utwente.nl
Idealized laboratory experiments reveal the existence of forced dissipative
hybrid Rossby shelf modes. The laboratory ocean consists of a deeper ocean, ac-
commodating basin scale Rossby modes, and a coastal step shelf, accommodating
trapped shelf modes. Planetary Rossby modes are mimicked in the laboratory
via a uniform topographic slope in the North-South direction. Hybrid modes
are found as linear modes in numerical calculations and similar streamfunction
patterns exist in streak photography of the rotating tank experiments. These
numerical calculations are based on depth-averaged potential vorticity dynamics
with Ekman forcing and damping. Preliminary nonlinear calculations explore
the deficiencies observed between reality and the linear solutions. The aim of


Source: Al Hanbali, Ahmad - Department of Applied Mathematics, Universiteit Twente


Collections: Engineering