CIRCULATION IN THE SKAGERRAK/NORTHERN NORTH SEA: ...

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XVI International Conference on Computational Methods in Water Resources (CMWR-XVI) Ingeniørhuset

CIRCULATION IN THE SKAGERRAK/NORTHERN NORTH SEA: INSIGHT INTO LOCAL RESPONSE (EDDIES) TO LARGE SCALE FORCING USING A NUMERICAL MODEL
Paper
Author:Lars Petter Røed <larspetter.roed@met.no> (Norwegian Meteorological Institute)
Jon Albretsen <jon.albretsen@met.no> (Norwegian Meteorological Institute)
Ingerid Fossum <ingerid.fossum@met.no> (Norwegian Meteorological Institute)
Presenter:Lars Petter Røed <larspetter.roed@met.no> (Norwegian Meteorological Institute)
Date: 2006-06-18     Track: Special Sessions     Session: Keynote speakers (reserved for keynotes only)
DOI:10.4122/1.1000000199
DOI:10.4122/1.1000000200

We assess the performance of an marginally eddy-resolving numerical ocean model in simulating the circulation and hydrography of the Skagerrak/northern North Sea area. In particular we aim at at explaining why recurrent anticyclonic eddies observed in the area off the southern tip of Norway appears. For this purpose of investigating highly non-linear processes we have to resort to a numeric ocean model. The model we use is MI-POM, a version of the widely used Princeton Ocean Model (POM). The model domain covers the Skagerrak/northern North Sea area with a 4 km grid nested into a 20 km grid model covering a much larger area. The atmospheric input is extracted from the European Centre for Medium-Range Weather Forecasts ERA40 reanalysis data and is used to compute all necessary dynamic and thermodynamic forcing. For validation comparison against mostly in situ hydrographic data are performed. To analyse the nonlinear behaviour of the model we employ a recently developed energy diagnostic scheme combined with a potential vorticity analysis.