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Suppressing the Drift and Bias of Coastal Circulation Models By Spectral Nudging

Keith Thompson1

(1) Department of Oceanography, Dalhousie University, Halifax, Nova Scotia, Canada

Main authors appear in bold

A simple method for suppressing the drift and bias in the temperature and salinity fields of coastal circulation models is described. The basic idea is to nudge the model's large scale features toward observed climatology in the vicinity of 0, 1 cycle per year and selected harmonics. The method is illustrated using a 1/16 degree resolution model of the shelf seas off the east coast of Canada and the northern US forced by hourly surface fluxes and realistic open boundary conditions. It is shown that the spectral nudging results in more realistic tides and thus more realistic predictions of water levels and currents. The impact on prediction skill of improved open boundary conditions from eddy resolving models of the adjacent North Atlantic will also be discussed.

Poster presentation

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This workshop is an initiative of the IGST (International GODAE Steering Team) under the special direction of Pierre De Mey, LEGOS (Laboratoire d'Etudes en Géophysique et Océanographie Spatiales)