Examination of Physical Processes Influencing Coastal Circulation over the Inner Scotian Shelf using a Five-Level Nested-Grid Ocean Circulation Model

Details Examination of Physical Processes Influencing Coastal Circulation over the Inner Scotian Shelf using a Five-Level Nested-Grid Ocean Circulation Model Examination of Physical Processes Influencing Coastal Circulation over the Inner Scotian Shelf using a Five-Level Nested-Grid Ocean Circulation Model

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmos41a1200s&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #OS41A-1200

Mathematics

Logic

3339 Ocean/Atmosphere Interactions (0312, 4504), 4217 Coastal Processes, 4534 Hydrodynamic Modeling, 4560 Surface Waves And Tides (1222), 4562 Topographic/Bathymetric Interactions

Scientific paper

A multiply nested-grid ocean circulation modeling system was developed for coastal waters of the Inner Scotian Shelf (ISS) by coupling a limited-area coastal circulation model to an operational shelf circulation model known as Dalcoast. The nested-grid system has five relocatable, dynamically-downscaling five sub- components. The outermost sub-component of the system has a coarse horizontal resolution of (1/12)o for simulating storm surges and two-dimensional barotropic shelf waves over the eastern Canadian shelf (ECS) from Labrador Shelf to the Gulf of Maine, and the innermost sub-component has a fine horizontal resolution of about ~180 m for simulating three-dimensional circulation and hydrographic distributions over Lunenburg Bay of Nova Scotia in the default setup. The nested-grid system is driven by meteorological and astronomical forcing. The meteorological forcing includes sea level air pressures, wind stress and surface heat/freshwater fluxes converted from the 3 hourly weather forecasts produced by the Meteorological Service of Canada. The astronomical forcing is the tidal sea levels and depth-mean currents produced by WebTide based on pre-calculated harmonic constants of five major tidal constitutes over the ECS. In this study, the nested-grid system is used to investigate main physical processes affecting the three-dimensional (3D) circulation and hydrographic distributions over the ISS in June and July 2006. Model results demonstrate that the coastal circulation and hydrographic distributions over the study region are affected significantly by tides, local wind forcing, remotely generated coastal waves during the study period.

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