Dynamics of the Gulf of Maine Joe Caracappa
Geography and Topography Bay of Fundy Georges Bank Scotian Shelf Northeast Channel Great South Channel Gulf of Maine Census, 2014
Mean Currents Gulf of Maine Census, 2014 Bigelow, 1927 Maine Gyre – Counterclockwise Georges bank Gyre – Clockwise
Water Masses Maine Surface Water (MSW) – Seasonally Variable Maine Intermediate Water (MIW) – Coldest region, sourced by Scotian Current Maine Bottom Water (MBW) – High salinity, Gulf Stream origin Water Masses MSW MIW MBW Brooks, 1985
Seasonal Changes Winter – Less Stratified, Slower mean currents Summer – More Stratified, Faster gyration Satellite Oceanography Data Lab, University of Maine.& Naime et al, 1994.
Biological Relevance JULY Very Productive Fishery (Specifically Georges Bank) Peak landings ~35 million pounds (1990) Current landings ~ 4 million pounds Support Large coastal population in US and Canada OCTOBER APRIL
References Bigelow, H. B. 1927. Physical Oceanography of the Gulf of Maine. Fish Bull. 40:511-1027. Brooks, David. 1985. Vernal Circulation in the Gulf of Maine. Journal of Geophysical Research. 90:4687-4705 Greenberg, David. 1982. Modeling the Mean Barotropic Circulation in the Bay of Fundy and Gulf of Maine. Journal of Physical Oceanography. 13:886-904 Lynch, Daniel et al. 1996. Comprehensive coastal circulation model with application to the Gulf of Maine. Continental Shelf Research. 16:875-906. Naimie, Christopher et al. 1994. Seasonal variation of the three- dimensional residual circulation on Georges Bank. Journal of Geophysical Research. 99:15,967-15,989. Satellite Oceanography Lab, University of Maine Gulf of Maine Census Bell,Tom. 2014. Scientists, fishermen at odds on cod stock in Gulf of Maine. Portland Press Herald.