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Zamorski, S. E., URI , Narragansett, USA, szamorski@gso.uri.edu
Donohue, K. A., URI , Narragansett, USA, kdonohue@gso.uri.edu

KUROSHIO EXTENSION MEANDERS: MODEL DATA-INTERCOMPARISON

Recent analysis from the Kuroshio Extension System Study, KESS, quantifies the frequency, wavelength and growth of Kuroshio Extension meanders between 143°E and 149°E with periods 3-60 days. Comparable analysis is performed on output from the high-resolution global Hybrid Coordinate Ocean Model (HYCOM) circulation model. Two model simulations are considered, one with data assimilation (``assimilation’’) and one without data assimilation (``free’’). Propagation speeds estimated along the Kuroshio Extension path from both simulations produce similar results to the KESS study; however, the assimilative run shows slightly longer wavelengths than the observations or the free run. KESS observations indicate that the interaction between Kuroshio Extension meanders and external westward propagating barotropic eddies are important for the local intensification of Kuroshio Extension meanders. Both model runs have westward propagating barotropic anomalies that interact with meanders. Sea surface height variance along the mean Kuroshio Extension path between 143°E to 155°E is about 4 times larger for both the baroclinic and barotropic sea surface height in the assimilation run compared to the free run.

Poster presentation

Session #:020
Date: 2/23/2012
Time: 17:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: Yes

PosterID: B1417