Document Type

Article

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Publication Date

11-5-2021

Abstract

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 M2-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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© 2021 The Authors. All rights reserved.

This work is licensed under an Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

The final publisher PDF has been archived here with permission from the copyright holder.

Publication Title

Journal of Geophysical Research: Oceans

Published Citation

Nazarian, R. H., Burns, C. M., Legg, S., Buijsman, M. C., Kaur, H., & Arbic, B. K. (2021). On the magnitude of canyon-induced mixing. Journal of Geophysical Research: Oceans, 126, e2021JC017671. https://doi.org/10.1029/2021JC017671

DOI

10.1029/2021JC017671

Peer Reviewed

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