Journal
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
Volume 126, Issue 11, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021JC017671
Keywords
internal waves; mixing; tides; canyon; topography
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Funding
- Fairfield University
- NASA Connecticut Space Grant Consortium [NNX15AI12H]
- National Oceanic and Atmospheric Administration, U.S. Department of Commerce [NA18OAR4320123]
- NASA [80NSSC18K0771]
- US National Science Foundation (NSF) [OCE-1537449, OCE-1851164]
- Office of Naval Research (ONR) [N00014-15-1-2288]
- College of Arts and Sciences
- Science Institute
- NASA [804102, NNX15AI12H] Funding Source: Federal RePORTER
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Submarine canyons dissipate a significant fraction of internal tide energy, contributing approximately 3.2%-7.8% of global internal tide input. This phenomenon is substantial on a global scale.
The location of mixing due to internal tides is important for both the ocean circulation as well as local biogeochemical processes. Numerous observations and modeling studies have shown that submarine canyons may be regions of enhanced internal tide-driven mixing, but there has not yet been a systematic study of all submarine canyons resolved in bathymetric datasets. Here, we parameterize the internal tide-driven dissipation from a suite of simulations and pair this with a global high-resolution, internal tide-resolving model and bathymetric dataset to estimate the internal-tide-driven dissipation that occurs in all documented submarine canyons. We find that submarine canyons dissipate a significant fraction of the incoming internal tide's energy, which is consistent with observations. When globally integrated, submarine canyons are responsible for dissipating 30.8-75.3 GW, or 3.2%-7.8% of the energy input into the M-2-frequency internal tides. This percentage of the internal tide energy that is dissipated in submarine canyons is comparable to or larger than previous calculations using extrapolations from observations of single canyons.
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