OES Seminars are held at 10am in the George Needler Boardroom (Room VS-427, van Steenburgh Building, Bedford Institute of Oceanography, Dartmouth, Nova Scotia).
September 2017 "Coffee Talk"
Friday September 08, 2017
Atlantic Shark Research Laboratory, Bedford Institute of Oceanography
Science and Species at Risk: White Shark and Allowable Harm
This talk was developed as an example of how life history information can be used to answer applied questions for Species at Risk. White shark is a data-limited species where substantial uncertainty exists in relation to maturity, fecundity, age and longevity as well as population trajectory. There is also substantial uncertainty on historical fishery removals and future potential for by-catch in Canadian fisheries. I present a simulation model which can be used to evaluate the effect of historical fishery removals as well as potential future removals on the population trajectory of white shark, accounting for uncertainty in life history as well as future environmental variability. From a practical perspective, this evaluates whether Recovery Goals for white shark are likely to be achieved and whether Allowable Harm (i.e. incidental captures by commercial fisheries) should be permitted under Section 73 of SARA.
Friday September 15, 2017
Coffee talks are open to everyone. Regular talks are at 10:00 on Fridays in the Needler Boardroom - Van Steenburgh 427, BIO. People not working at BIO will need to be signed in at the front desk, main entrance to attend (or give) the seminar. Talks are scheduled for 1 hour and we suggest preparing 40 minutes worth of material. Questions and discussion should more than fill any remaining time. Material can be unfinished work in progress, proposed projects or cruises, cruise reports, ideas you wish to expose to critical review before undertaking studies, recent conference reports, finished talks presented elsewhere long ago, etc. We particularly welcome talks from scientists visiting BIO and can make special efforts to slot them into the regular series or hold seminars on other days to fit their timetable.
Friday September 29, 2017
Ross Hendry (BIO)
A review of ocean circulation in the vicinity of the Grand Banks: the Gulf Stream, the Labrador Current, and the Slope Water Current
Studies of deep-ocean circulation in the vicinity of the Grand Banks of Newfoundland have a long and sometimes controversial history. The dominant surface currents in this region are the Labrador Current and the eastward flowing Gulf Stream and its northward continuation as the North Atlantic Current. The Labrador Current enters the region from the north as a southward flow along the eastern slope of the Grand Banks, recirculates to the south and east, and then exits to the northeast along the inshore edge of the North Atlantic Current. The Slope Water Current, a relatively minor eastward flow associated with the front separating coastal shelf water to the north and warm Slope Water to the south, merges with the Labrador Current recirculation near 50°W. The interannual variability in these currents has a large effect on water properties in the Slope Water, on the Scotian Shelf, and in the Gulf of Maine.
Much of the historical controversy surrounding these currents hinges on the interpretation of hydrographic measurements. Systematic near-global mapping of sea level provided by altimetric satellites since 1993 provides new insights. This presentation revisits influential historical studies dealing with the splitting of the Gulf Stream at 50°W, the nature and path of the Slope Water Current, and the Labrador Current recirculation and attempts an updated synthesis of the regional circulation.