U.S. GLOBEC: Importance of Physical and Biological Processes to Population Regulation of Cod and Haddock on Georges Bank: a Model-Based Study

D. Lynch, F. Werner, J. Loder, M. Sinclair, G. Lough, I. Perry, D. Greenberg, F. Page, P. Smith, C. Naimie, C. Hannah, C. Meise

Dartmouth College
Univ. of North Carolina
National Marine Fisheries Service
Department of Fisheries and Oceans

This is a continuation of a site-specific biophysical modeling study of Georges Bank and the adjacent shelf. It concentrates on increased sophistication and realism in circulation and transport modeling for Georges Bank and the adjacent shelf areas, using the Dartmouth finite element models; on individual-based models of larval fish early life stages, incorporating several advances in the representation of the role of turbulence, stratification, and feeding; and on retrospective studies on shelf-wide and interannual/decadal scales of hydrography, circulation, and abundance/distribution of the target species. Comprehensive studies, including data assimilation, will be focussed on simulating and interpreting physical and biological conditions on the Bank during GLOBEC field years and during the MARMAP decade. Analysis of historical zooplankton distributions and individual-based zooplankton modeling will address the relative importance of the Gulf of Maine and Scotian Shelf as sources of Georges Bank populations. A moored field component is included to measure the key inflows to the Georges Bank/Gulf of Maine system. This project will be closely coordinated with proposed Canada GLOBEC studies on the Scotian Shelf and Pacific coast, including inter-regional comparisons and cooperation in methodological advances.