Program and Agenda

Abstract

GLOBAL COMPUTATION OF TIDAL CONVERSION RESOLVED INTO VERTICAL MODES

A direct computation of the tidal generation of internal waves over the global ocean is presented. The computation is based on linear wave theory, and performed for the M2 tidal constituent. In contrast to previous similar computations, the internal tide is projected on the vertical eigenmodes, which gives two advantages. First, the vertical density profile and the finite ocean depth are taken into account in a fully consistent way, in contrast to earlier work based on the WKB-approximation. Nevertheless, the total global tidal conversion differs by less than 10 percent from previous computations, which is reassuring. Second, the information about the distribution of the conversion energy over different vertical modes is valuable, since the lowest modes can propagate over long distances, while high modes are more likely to dissipate locally, near the generation site. Thus, the present work paves the way for future work on the vertical and horizontal distribution of the mixing caused by internal tides.

Authors

Falahat, S., Stockholm University, Sweden, saeed@misu.su.se

Nycander, J., Stockholm University, Sweden, jonas@misu.su.se

Roquet, F., Stockholm University, Sweden, fabien.roquet@gmail.com

Details

Oral presentation

Session #:107
Date: 2/27/2014
Time: 14:15
Location: 316 B

Presentation is given by student: No