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Seaglider sampling pattern over WA continental slope. (a) WA slope bathymetry [obtained from the National Oceanic and Atmospheric Administration (NOAA) National Geophysical Data Center (GEODAS) 1-min gridded data; http://www.ngdc.noaa.gov/mgg/bathymetry/relief.html], Seaglider dive midpoint (black circle) and track (thin black line) locations, and overlay of the intended navigational track for CF (blue) and GH (red) transects. Black labels show WA and Vancouver Island, British Columbia (BC). Bathymetry is contoured at 100- and 200-m depth, at intervals of 200 m for depths of 200–1000 m, and at intervals of 500 m for depths greater than 1000 m. The 200-m isobath is in boldface. (b) Pattern occupation by year. Transit along the CF line is in blue, GH in red, with transect boundaries (turnaround points) indicated by black vertical lines.
Water mass characteristics over the continental slope. (a) θ–S-depth diagram for profiles collected within 50 km from the shelf break off CF. Values are normalized such that their area integral in θ–S space is equal to 1, making each an empirical probability density function (PDF). Gray contours are σθ in intervals of 0.5 kg m−3. The σθ = 26.55 kg m−3 contour is also shown in light dashed gray. Green contours are of πθ in intervals of 0.5 kg m−3. (b) As in (a), but for GH. (c) Histogram of πθ along σθ = 26.55 kg m−3 for profiles collected in the offshore region (OFF, green), CF inshore region (blue) and GH inshore region (red). Offshore region is defined as >50 km from the shelf break. (d) Difference in average salinity along isopycnals (from σθ = 25.8 to 27.2 kg m−3 in intervals of 0.005 kg m−3) between the inshore regions of GH and CF (〈S〉GH − 〈S〉CF). Dark gray line is the difference in means and light gray lines are 95% confidence bounds from a Welch's unpaired t test for differences of means between two populations.