Comments (2)
- Bandwidth 2e-6 Hz to 1e-5 Hz (first non-zero frequency bin to < diurnal peak).
- Notable effects: Near-shelf intensification. Canyon-axis intensification. Seasonality.
Subdiurnal outline
Upper Slope - Near-shelf intensification
Describe (what do I see):
- Depth-averaged / multi-annual time-averaged PSD comparison to K1, f, and M2. About K1/f equivalent at the lower end, diminishes by an order of magnitude before reaching the K1 peak.
- Most of depth equally distributed between cross- and along-slope, and nearly rectilinear in CW and CCW, with slightly more power in the cross-slope and CW components.
- Below -250 m intensification in along-slope, CCW signal, of about 2x orders of magnitude, to overtake cross-slope / CW signal in the lower depths.
- Vertical scale of effect approximately 150 m AB.
- Seasonality evident in prominent events in the fall and winter, with a spring/summer lull.
- Spring-neap is not obvious, but may be evident in barotropic time series (compare local vs remote forcing).
- Be sure these are all quantified and related in clear figures.
Compare (what did others see):
- Allen, 1976.
- Thomson & Crawford, 1982.
- Chapman, 1983.
- Crawford & Thomson, 1984.
- Crawford, 1984.
- Hotchkiss & Wunsch (1982) found evidence of up to a 10x increase along-slope near to Hudson Canyon, and a vertical scale for the effect of about 150 m AB around -400 m depth. Correlation to direction and strength of both prevailing winds and mean currents, and storm events.
- Flather, 1988.
- Brink, 1991.
- Drakopoulos & Marsden, 1993.
- Foreman & Thomson, 1997.
- Polzin et al. (1997) found an increase of about 15x up to about 150 m over slope topography.
- Cummins et al., 2001.
- Jayne & St. Laurent, 2001.
- Nash et al. (2004) found similar effects at the Mid-Atlantic Bight slope off of Virginia.
- Kelly et al., 2010.
- Klymak et al., 2011.
- Klymak et al., 2012.
- Kunze et al. (2012) found similar effects at the slope near Monterey and Soquel canyons.
- Klymak et al., 2013.
- Martini et al., 2013.
- Johnston & Rudnick, 2014.
- Terker et al., 2014.
- Gemmrich & Klymak, 2015.
- Robertson et al., 2017.
- Quantify (compare) where possible.
- Find additional sources.
Explain (what may be causing this):
- Evanescent (subdiurnal is sub-inertial) internal waves locally generated from 'rubbing' subdiurnal currents incident with the subcritical upper-slope (radiate upwards) (Hotchiss & Wunsch, Polzin, Kunze, Cummins).
- Increased stratification effects near areas of high 'topographic relief', such as the shelf-break and slopes. These highly stratified turbulent layers experience the effects of reflection/scattering and internal tide and lee-wave generation. May amplify internal waves, in general.
- Discuss strengths and weaknesses of each theory.
Axis - Canyon-axis intensification
Describe (what do I see):
- Depth-averaged / multi-annual time-averaged PSD comparison to K1, f, and M2. Less than K1 or f throughout the band, and relatively level.
- Most of depth along-canyon, and rectilinear in CW and CCW.
- Below -750 m intensification in along-canyon, rectilinear signal, of about 2x orders of magnitude.
- Vertical scale of effect approximately 250 m AB.
- Seasonality is less evident in the canyon, but select prominent events in the fall and winter may still be visible.
- Spring-neap is not obvious, but may be evident in barotropic time series (compare local vs remote forcing).
- Be sure these are all quantified and related in clear figures.
Compare (what did others see):
- Hotchkiss & Wunsch (1982) also found evidence of increased internal tides within Hudson Canyon, with a vertical scale for the effect of about 250 m AB around -800 m depth. Correlation to direction and strength of both prevailing winds and mean currents, as they affect upwelling which drives along-canyon currents. Only very strong storm events evident.
- Petruncio et al., 1998.
- Carter & Gregg (2002) observed a 200-300 m thick intensified bottom layer along the axis of Monterey Canyon.
- Xu & Noble, 2009.
- Kunze et al. (2002, 2012) found similar effects within both Monterey Canyon and Soquel Canyon, with intensification of over an order of magnitude at a vertical scale approximate 200 - 300 m AB near to -1000 m depth.
- Wain et al., 2013.
- Alberty et al., 2017.
- Kampf, 2018.
- Hamann & Alford, 2020.
- Quantify (compare) where possible.
- Find additional sources.
Explain (what may be causing this):
- Evanescent (subdiurnal is sub-inertial) internal waves locally generated from 'rubbing' subdiurnal currents incident with the irregular canyon topography (floor/slope and wall features).
- Topographically increased stratification (as for Upper Slope) amplifying the local internal waves.
- Discuss strengths and weaknesses of each theory.
from internal_waves_barkley_canyon.
Closed, for reference. Adapted into new 'chapters'.
from internal_waves_barkley_canyon.
Related Issues (20)
- Continuum summary HOT 1
- Seasonality HOT 1
- Slope effects HOT 2
- Critical slope analysis HOT 7
- Continuum fits HOT 9
- Wind forcing HOT 13
- Depth-frequency plots HOT 1
- CMOS presentation HOT 1
- Band-pass velocities HOT 1
- Depth check for effect scales HOT 1
- Writing updates HOT 9
- Continuum response HOT 6
- Mean-flow in lower canyon HOT 6
- Inter-annual variability / similarity HOT 1
- Axis75 high-frequency noise HOT 8
- NI discussion HOT 2
- Continuum discussion HOT 3
- Thesis revisions HOT 1
- Spectral shoulder HOT 11
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from internal_waves_barkley_canyon.