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Internal waves -- Mathematical models, Internal waves -- Remote sensing, Tidal currents


A near-global model for the sea-surface expression of the baroclinic tide has been developed using exact-repeat mission altimetry. The methodology used differs in detail from other altimetry-based estimates of the open ocean baroclinic tide, but it leads to estimates which are broadly similar to previous results. It may be used for prediction of the baroclinic sea level anomaly at the frequencies of the main diurnal and semidiurnal tides, K1, O1, M2, S2, as well as the annual modulates of M2, denoted MA2 and MB2. Based on a comparison with independent CryoSat-2 data, the tidal predictions are capable of explaining more than 13 cm2 variance at a few locations. The predicted tides are also validated by comparison with a database of hourly currents inferred from drogued surface drifters. The database is large enough to permit assessment of a simple model for scattering of the low-mode tide. Results indicate a scattering time scale of approximately one day, consistent with a priori estimates of time-variable refraction by the mesoscale circulation.


This is a pre-print version of an article that submitted to the Journal of Physical Oceanography.

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