Internal Waves Force Elevated Turbulent Mixing at Barkley Canyon. Anstey, K. J., Klymak, J. M., Mihaly, S. F., & Thomson, R. E. J. Geophys. Res. Oceans, 129(7):e2023JC020760, 2024. e2023JC020760 2023JC020760doi abstract bibtex Submarine canyons are hot spots for topography-internal wave interactions, with elevated mixing contributing to regional water mass transport and productivity. Two velocity time series compare and contrast internal waves deep inside Barkley Canyon to a nearby site on the shelf-break slope of the Vancouver Island Continental Shelf. Elevation of internal wave energy occurs near topography, up to a factor of 10 above the slope and 100 in the canyon. All frequency bands display strong seasonal variability but weak interannual variability. Diurnal (K1) energy is sub-inertial, trapped along topography, and forced locally through barotropic motions. Both sites have high near-inertial (NI) energy linked to wind events, though fewer events are observed deep inside the canyon. At the slope site, near-inertial energy is attenuated with depth, while in the canyon it is amplified near the bottom. Freely propagating semidiurnal (M2) energy appears focused near critical shelf-break and canyon floor topography, due to local and remote baroclinic forcing. The high-frequency internal wave continuum has enhanced near-bottom energy at both sites (up to 7 × the Garrett-Munk spectrum), and inferred dissipation rates, $ɛ$, reaching 10-7 W kg-1 near topography. Dissipation is most strongly correlated with semidiurnal energy variability at both sites, with secondary contributors that are site dependent. Forcing power law fits are $ɛ∼$M20.8+ \varepsilon \sim M_2\textasciicircum0.8+\ SubK10.6 \\textSub_K_1\textasciicircum0.6\ on the slope, and $ɛ∼$M21.5+ \varepsilon \sim M_2\textasciicircum1.5+\ NI0.2 in the canyon. There is also a build-up of ``shoulder'' energy (PSh) near the buoyancy frequency, with a power law fit to dissipation of PSh $∼$ $ɛ$0.3 at both sites.p̌hantom\
@Article{ ansteyetal24,
Title = {Internal {{Waves Force Elevated Turbulent Mixing}} at
{{Barkley Canyon}}},
Author = {Anstey, Kurtis J. and Klymak, Jody M. and Mihaly, Steven
F. and Thomson, Richard E.},
Year = {2024},
Journal = {J. Geophys. Res. Oceans},
Volume = {129},
Number = {7},
Pages = {e2023JC020760},
DOI = {10.1029/2023JC020760},
URLDate = {2024-11-21},
Abstract = {Submarine canyons are hot spots for topography-internal
wave interactions, with elevated mixing contributing to
regional water mass transport and productivity. Two
velocity time series compare and contrast internal waves
deep inside Barkley Canyon to a nearby site on the
shelf-break slope of the Vancouver Island Continental
Shelf. Elevation of internal wave energy occurs near
topography, up to a factor of 10 above the slope and 100 in
the canyon. All frequency bands display strong seasonal
variability but weak interannual variability. Diurnal (K1)
energy is sub-inertial, trapped along topography, and
forced locally through barotropic motions. Both sites have
high near-inertial (NI) energy linked to wind events,
though fewer events are observed deep inside the canyon. At
the slope site, near-inertial energy is attenuated with
depth, while in the canyon it is amplified near the bottom.
Freely propagating semidiurnal (M2) energy appears focused
near critical shelf-break and canyon floor topography, due
to local and remote baroclinic forcing. The high-frequency
internal wave continuum has enhanced near-bottom energy at
both sites (up to 7 {\texttimes} the Garrett-Munk
spectrum), and inferred dissipation rates, {$\varepsilon$},
reaching 10-7 W kg-1 near topography. Dissipation is most
strongly correlated with semidiurnal energy variability at
both sites, with secondary contributors that are site
dependent. Forcing power law fits are
{$\varepsilon\sim$}M20.8+ {\textbackslash}varepsilon
{\textbackslash}sim
M\_2{\textasciicircum}0.8+{\textbackslash} SubK10.6
\{{\textbackslash}textSub\_K\_1{\textasciicircum}0.6{\textbackslash}
on the slope, and {$\varepsilon\sim$}M21.5+
{\textbackslash}varepsilon {\textbackslash}sim
M\_2{\textasciicircum}1.5+{\textbackslash} NI0.2 in the
canyon. There is also a build-up of ``shoulder'' energy
(PSh) near the buoyancy frequency, with a power law fit to
dissipation of PSh {$\sim$} {$\varepsilon$}0.3 at both sites.\vphantom\}},
copyright = {All rights reserved},
langid = {english},
Keywords = {Barkley Canyon,continental slope,internal
waves,jmkrefereed,mixing,submarine canyon,turbulent
dissipation},
Note = {e2023JC020760 2023JC020760},
File = {/Users/jklymak/Zotero/storage/X3Y2HVY6/Anstey et al. -
2024 - Internal Waves Force Elevated Turbulent Mixing at
Barkley
Canyon.pdf;/Users/jklymak/Zotero/storage/6ZULD53Q/2023JC020760.html}
}
Downloads: 0
{"_id":"5knFvecbu5Qf38HmJ","bibbaseid":"anstey-klymak-mihaly-thomson-internalwavesforceelevatedturbulentmixingatbarkleycanyon-2024","author_short":["Anstey, K. J.","Klymak, J. M.","Mihaly, S. F.","Thomson, R. E."],"bibdata":{"bibtype":"article","type":"article","title":"Internal Waves Force Elevated Turbulent Mixing at Barkley Canyon","author":[{"propositions":[],"lastnames":["Anstey"],"firstnames":["Kurtis","J."],"suffixes":[]},{"propositions":[],"lastnames":["Klymak"],"firstnames":["Jody","M."],"suffixes":[]},{"propositions":[],"lastnames":["Mihaly"],"firstnames":["Steven","F."],"suffixes":[]},{"propositions":[],"lastnames":["Thomson"],"firstnames":["Richard","E."],"suffixes":[]}],"year":"2024","journal":"J. Geophys. Res. Oceans","volume":"129","number":"7","pages":"e2023JC020760","doi":"10.1029/2023JC020760","urldate":"2024-11-21","abstract":"Submarine canyons are hot spots for topography-internal wave interactions, with elevated mixing contributing to regional water mass transport and productivity. Two velocity time series compare and contrast internal waves deep inside Barkley Canyon to a nearby site on the shelf-break slope of the Vancouver Island Continental Shelf. Elevation of internal wave energy occurs near topography, up to a factor of 10 above the slope and 100 in the canyon. All frequency bands display strong seasonal variability but weak interannual variability. Diurnal (K1) energy is sub-inertial, trapped along topography, and forced locally through barotropic motions. Both sites have high near-inertial (NI) energy linked to wind events, though fewer events are observed deep inside the canyon. At the slope site, near-inertial energy is attenuated with depth, while in the canyon it is amplified near the bottom. Freely propagating semidiurnal (M2) energy appears focused near critical shelf-break and canyon floor topography, due to local and remote baroclinic forcing. The high-frequency internal wave continuum has enhanced near-bottom energy at both sites (up to 7 × the Garrett-Munk spectrum), and inferred dissipation rates, $ɛ$, reaching 10-7 W kg-1 near topography. Dissipation is most strongly correlated with semidiurnal energy variability at both sites, with secondary contributors that are site dependent. Forcing power law fits are $ɛ∼$M20.8+ \\varepsilon \\sim M_2\\textasciicircum0.8+\\ SubK10.6 \\\\textSub_K_1\\textasciicircum0.6\\ on the slope, and $ɛ∼$M21.5+ \\varepsilon \\sim M_2\\textasciicircum1.5+\\ NI0.2 in the canyon. There is also a build-up of ``shoulder'' energy (PSh) near the buoyancy frequency, with a power law fit to dissipation of PSh $∼$ $ɛ$0.3 at both sites.p̌hantom\\","copyright":"All rights reserved","langid":"english","keywords":"Barkley Canyon,continental slope,internal waves,jmkrefereed,mixing,submarine canyon,turbulent dissipation","note":"e2023JC020760 2023JC020760","file":"/Users/jklymak/Zotero/storage/X3Y2HVY6/Anstey et al. - 2024 - Internal Waves Force Elevated Turbulent Mixing at Barkley Canyon.pdf;/Users/jklymak/Zotero/storage/6ZULD53Q/2023JC020760.html","bibtex":"@Article{\t ansteyetal24,\n Title\t\t= {Internal {{Waves Force Elevated Turbulent Mixing}} at\n\t\t {{Barkley Canyon}}},\n Author\t= {Anstey, Kurtis J. and Klymak, Jody M. and Mihaly, Steven\n\t\t F. and Thomson, Richard E.},\n Year\t\t= {2024},\n Journal\t= {J. Geophys. Res. Oceans},\n Volume\t= {129},\n Number\t= {7},\n Pages\t\t= {e2023JC020760},\n DOI\t\t= {10.1029/2023JC020760},\n URLDate\t= {2024-11-21},\n Abstract\t= {Submarine canyons are hot spots for topography-internal\n\t\t wave interactions, with elevated mixing contributing to\n\t\t regional water mass transport and productivity. Two\n\t\t velocity time series compare and contrast internal waves\n\t\t deep inside Barkley Canyon to a nearby site on the\n\t\t shelf-break slope of the Vancouver Island Continental\n\t\t Shelf. Elevation of internal wave energy occurs near\n\t\t topography, up to a factor of 10 above the slope and 100 in\n\t\t the canyon. All frequency bands display strong seasonal\n\t\t variability but weak interannual variability. Diurnal (K1)\n\t\t energy is sub-inertial, trapped along topography, and\n\t\t forced locally through barotropic motions. Both sites have\n\t\t high near-inertial (NI) energy linked to wind events,\n\t\t though fewer events are observed deep inside the canyon. At\n\t\t the slope site, near-inertial energy is attenuated with\n\t\t depth, while in the canyon it is amplified near the bottom.\n\t\t Freely propagating semidiurnal (M2) energy appears focused\n\t\t near critical shelf-break and canyon floor topography, due\n\t\t to local and remote baroclinic forcing. The high-frequency\n\t\t internal wave continuum has enhanced near-bottom energy at\n\t\t both sites (up to 7 {\\texttimes} the Garrett-Munk\n\t\t spectrum), and inferred dissipation rates, {$\\varepsilon$},\n\t\t reaching 10-7 W kg-1 near topography. Dissipation is most\n\t\t strongly correlated with semidiurnal energy variability at\n\t\t both sites, with secondary contributors that are site\n\t\t dependent. Forcing power law fits are\n\t\t {$\\varepsilon\\sim$}M20.8+ {\\textbackslash}varepsilon\n\t\t {\\textbackslash}sim\n\t\t M\\_2{\\textasciicircum}0.8+{\\textbackslash} SubK10.6\n\t\t \\{{\\textbackslash}textSub\\_K\\_1{\\textasciicircum}0.6{\\textbackslash}\n\t\t on the slope, and {$\\varepsilon\\sim$}M21.5+\n\t\t {\\textbackslash}varepsilon {\\textbackslash}sim\n\t\t M\\_2{\\textasciicircum}1.5+{\\textbackslash} NI0.2 in the\n\t\t canyon. There is also a build-up of ``shoulder'' energy\n\t\t (PSh) near the buoyancy frequency, with a power law fit to\n\t\t dissipation of PSh {$\\sim$} {$\\varepsilon$}0.3 at both sites.\\vphantom\\}},\n copyright\t= {All rights reserved},\n langid\t= {english},\n Keywords\t= {Barkley Canyon,continental slope,internal\n\t\t waves,jmkrefereed,mixing,submarine canyon,turbulent\n\t\t dissipation},\n Note\t\t= {e2023JC020760 2023JC020760},\n File\t\t= {/Users/jklymak/Zotero/storage/X3Y2HVY6/Anstey et al. -\n\t\t 2024 - Internal Waves Force Elevated Turbulent Mixing at\n\t\t Barkley\n\t\t Canyon.pdf;/Users/jklymak/Zotero/storage/6ZULD53Q/2023JC020760.html}\n}\n\n","author_short":["Anstey, K. J.","Klymak, J. M.","Mihaly, S. F.","Thomson, R. E."],"key":"ansteyetal24","id":"ansteyetal24","bibbaseid":"anstey-klymak-mihaly-thomson-internalwavesforceelevatedturbulentmixingatbarkleycanyon-2024","role":"author","urls":{},"keyword":["Barkley Canyon","continental slope","internal waves","jmkrefereed","mixing","submarine canyon","turbulent dissipation"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://ocean-physics.seos.uvic.ca/~jklymak/data/CV0.bib","dataSources":["v2hxmxpd89RC8MfKj"],"keywords":["barkley canyon","continental slope","internal waves","jmkrefereed","mixing","submarine canyon","turbulent dissipation"],"search_terms":["internal","waves","force","elevated","turbulent","mixing","barkley","canyon","anstey","klymak","mihaly","thomson"],"title":"Internal Waves Force Elevated Turbulent Mixing at Barkley Canyon","year":2024}