Report of the

U.S. GLOBEC Georges Bank

Science Meeting

18 - 20 November 2003, Rhode Island

 


Cover Page

Acknowledgements

Introduction

Narrative

Presentation Abstracts

Poster Presentations

Appendix I: Agenda

Appendix II: List of Participants

Appendix III: List of Planned Publications


Application of FVCOM to the Gulf of Maine/Georges Bank: Simulated and Assimilated Modeling Studies of the Seasonal Variability of Stratification and Subtidal Circulation

Chen, C1, H. Liu1, R. C. Beardsley2, G. Cowles1, J. Pringle3, and Brian Rothschild1
1School for Marine Science and Technology, University of Massachusetts-Dartmouth, New Bedford, MA 02744
2Department of Physical Oceanography, Woods Hole Oceanographic Institution, Woods Hole, MA 02543
3Center for the Earth, Planetary and Geophysics Research, University of New Hampshire, Durham, NH 03824

An operational model forecasting and hindcasting system for the Gulf of Maine (GOM)/Georges Bank (GB) region is being developed using the finite-volume coastal ocean model FVCOM. The model domain is configured with non-overlapping unstructured triangular grid cells with horizontal resolution of 1 km on the northern flank of GB, Browns Bank, and inner-shelf coastal regions, and 3-10 km in the interior of GOM and the regions close to the open boundary. FVCOM is driven using real-time surface wind stress and heat flux fields produced using a GOM/GB meso-scale meteorological model (MM5). The MM5-FVCOM model system is being validated by application to simulate and assimilate the 1995 and 1999 seasonal variations of stratification and subtidal circulation in the GOM/GB. Initial results show that the MM5-FVCOM model system has captured the basic dynamics controlling the large-scale physics in the GOM/GB. Good agreement between model-predicted and observed currents was found on the southern flank of GB, but not in the Northeast Channel (NEC). This suggests that the subtidal circulation on GB is mainly controlled by local forcing, while the currents in the eastern GOM/GB are strongly influenced by water input from the Scotian Shelf. Nudging assimilation is used to merge the model-computed and observed currents in the NEC. This approach produces a more realistic pattern of subtidal currents and on-bank transport on the northeastern flank of GB.

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