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


Transport and Retention of Dormant Calanus finmarchicus in the Gulf of Maine: Insights from a Particle-Tracking Model

Johnson, C.L.1, J.M. Pringle2, and C.S. Chen3
1Department of Engineering Math, Dalhousie University, Halifax, NS, Canada B3J 2X4
2Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA 92032
3School for Marine Science and Technology, University of Massachusetts-Darmouth, New Bedore, MA 02744-1221

Population growth of the copepod Calanus finmarchicus on Georges Bank is seeded in part by individuals that emerge from dormancy in the southern Gulf of Maine (GOM) and are then transported onto the Bank. Processes that affect the transport and retention of dormant C. finmarchicus in the GOM may therefore have an important influence on population dynamics and availability of early copepod stages as prey for larval fish on the Bank. A three-dimensional, particle-tracking circulation model (FVCOM GOM/GB) is used to estimate retention times of C. finmarchicus in the GOM and transport pathways both within the GOM and between the GOM and slope water. The inter-annual variability of the retention times and transport pathways is estimated from the variability in the physical forcing of the ocean. The timescales of physical retention in the GOM are compared to the timescale of dormancy to determine whether C. finmarchicus seeding Georges Bank are primarily endogenous to the GOM or are transported into the GOM from elsewhere, and the simulations of inter-annual variation in the transport pathways are used to discover how climate variability influences sources of C. finmarchicus to the Bank.

A powerpoint version and an html version of this presentation are available on-line.