Project CONVERGE: Initial Results From the Mapping of Surface Currents in Palmer Deep

Hank Statscewich1, Josh T Kohut2, Peter Winsor1, Matthew J Oliver3, Kim Sarah Bernard4, Megan A Cimino3 and William Fraser5, (1)University of Alaska Fairbanks, College of Fisheries and Ocean Sciences, Fairbanks, AK, United States, (2)Rutgers University, Marine and Coastal Sciences, New Brunswick, NJ, United States, (3)University Of Delaware, Lewes, DE, United States, (4)Oregon State University, Corvallis, OR, United States, (5)Polar Oceans Research Group, United States
Abstract:
The Palmer Deep submarine canyon on the Western Antarctic Peninsula provides a conduit for upwelling of relatively warm, nutrient rich waters which enhance local primary production and support a food web productive enough to sustain a large top predator biomass. In an analysis of ten years of satellite-tagged penguins, Oliver et al. (2013) showed that circulation features associated with tidal flows may be a key driver of nearshore predator distributions. During diurnal tides, the penguins feed close to their breeding colonies and during semi-diurnal tides, the penguins make foraging trips to the more distant regions of Palmer Deep. It is hypothesized that convergent features act to concentrate primary producers and aggregate schools of krill that influence the behavior of predator species. The initial results from a six month deployment of a High Frequency Radar network in Palmer Deep are presented in an attempt to characterize and quantify convergent features. During a three month period from January through March 2015, we conducted in situ sampling consisting of multiple underwater glider deployments, small boat acoustic surveys of Antarctic krill, and penguin ARGOS-linked satellite telemetry and time-depth recorders (TDRs). The combination of real-time surface current maps with adaptive in situ sampling introduces High Frequency Radar to the Antarctic in a way that allows us to rigorously and efficiently test the influence of local tidal processes on top predator foraging ecology.