Ocean Physics MSc thesis at the University of Victoria, under the supervision of Dr. Jody Klymak, characterising the internal wave field at Barkley Canyon.
Bandwidth >M4 (~5e-5 Hz) to base buoyancy frequency, N_0 (~4e-4 Hz).
Notable effects: Greater than GM. Moderate shelf and canyon-axis intensification. Very specific recurring seasonality. Not rectilinear in canyon.
Continuum outline
Upper Slope - Near-shelf intensification
Describe (what do I see):
fM2 and M4 peaks.
Depth-averaged / multi-annual time-averaged PSD comparison to GM (in both Cartesian and rotary).
Identify critical frequency for slope below the Upper Slope ADCP.
Mostly cross-slope, with along-slope becoming about equal below -250 m.
Mostly CW, with CCW becoming about equal below -250 m.
Intensification of about 1x orders of magnitude, mostly evident in the cross-slope and CW components, below -250 m.
Vertical scale of effect about 150 m AB.
Seasonality is mostly evident in a recurring pulse each April/May and October/November, which shows up mostly in the bottom-intensified layer below -250 m.
There is little to no evidence of spring-neap modulation, similar to the inertial signal.
Be sure these are all quantified and related in clear figures.
Compare (what did others see):
Cairns & Williams, 1976.
Muller et al., 1978.
Garrett & Munk, 1979.
Munk & Garrett, 1979.
Gargett et al., 1981.
Levine et al., 1986.
Gregg & Kunze, 1991.
Levine et al., 1997.
Polzin et al., 1997.
Levine, 2002.
Polzin, 2004.
Kunze & Llewellyn, 2004.
Rainville & Pinkel, 2006.
Alford et al., 2007.
Polzin & Lvov, 2011.
Kunze, 2017.
Alford et al., 2017.
Chen et al., 2019.
Nelson et al., 2020.
Quantify (compare) where possible.
Find additional sources.
Explain (what may be causing this):
Discuss strengths and weaknesses of each theory.
Axis - Canyon-axis intensification
Describe (what do I see):
fM2 and M4 peaks.
Depth-averaged / multi-annual time-averaged PSD comparison to GM (in both Cartesian and rotary).
Identify critical frequency for canyon-axis slope (and perhaps the walls).
Equally distributed between cross- and along-canyon components.
Oddly, it's mostly CW, with CCW becoming about equal below -850 m.
Intensification of about 1x orders of magnitude, mostly evident in the cross- and along-slope, CW components, below -750 m.
Vertical scale of effect about 250 m AB.
Seasonality is mostly evident in a recurring pulse each April/May and October/November, which shows up mostly in the bottom-intensified layer below -750 m.
There may be weak spring-neap modulation (compare depth-mean to surface tides).
Be sure these are all quantified and related in clear figures.
Continuum outline
Upper Slope - Near-shelf intensification
Describe (what do I see):
Compare (what did others see):
Explain (what may be causing this):
Axis - Canyon-axis intensification
Describe (what do I see):
Compare (what did others see):
Explain (what may be causing this):