期刊
ATMOSPHERE-OCEAN
卷 50, 期 3, 页码 277-300出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/07055900.2012.680430
关键词
interannual variability; eastern Canadian shelf; Labrador Current; Gulf Stream; ocean circulation; monthly mean anomaly
资金
- Global Ocean-Atmosphere Prediction and Predictability project (GOAPP)
- Platform for Ocean Knowledge Management (POKM) project
- Lloyd's Register Educational Trust (The LRET)
This study examines the main physical processes affecting the interannual variability of circulation over the eastern Canadian continental shelf (ECS) based on numerical circulation results for the period 1988-2004 produced by a regional ocean-ice model. The regional circulation model is applied to the northwest Atlantic and uses a horizontal curvilinear grid with a horizontal resolution of approximately 1/4 degrees. The model is forced by atmospheric reanalysis fields produced by Large and Yeager (2004) and boundary forcing based on the ocean reanalysis data produced by Smith et al. (2010). In comparison with previous observational and numerical results in the literature, the regional circulation model has reasonable skill in simulating the large-scale circulation and associated seasonal and interannual variability over the ECS. Complex Empirical Orthogonal Function (CEOF) analysis is used to examine the interannual variability in the monthly mean temperature and salinity anomalies in the model. The CEOF analysis of model results demonstrates that the interannual variability over the Labrador and northern Newfoundland shelves is significantly affected by the variability at high latitudes which propagates onto these shelves through the northern open boundary. Over the eastern Newfoundland Shelf, the interannual variability is significantly affected by the non-linear interaction of the Labrador Current with the North Atlantic Current and by the variability propagating from the southern Labrador Shelf. The interannual variability of circulation and hydrography over the Slope Water region off the Scotian Shelf is significantly affected by anomalies advected by the Gulf Stream and by the non-linear dynamics taking place in the deep waters to the south of the Tail of the Grand Banks.
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