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Sensitivity of deep ocean mixing to local Internal tide breaking and mixing efficiency

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Title: Sensitivity of deep ocean mixing to local Internal tide breaking and mixing efficiency
Authors: Cimoli, L
Caulfield, CP
Johnson, HL
Marshall, DP
Mashayek, A
Naveira Garabato, AC
Vic, C
Item Type: Journal Article
Abstract: There have been recent advancements in the quantification of parameters describing the proportion of internal tide energy being dissipated locally and the “efficiency” of diapycnal mixing, that is, the ratio of the diapycnal mixing rate to the kinetic energy dissipation rate. We show that oceanic tidal mixing is nontrivially sensitive to the covariation of these parameters. Varying these parameters one at a time can lead to significant errors in the patterns of diapycnal mixing-driven upwelling and downwelling and to the over and under estimation of mixing in such a way that the net rate of globally integrated deep circulation appears reasonable. However, the local rates of upwelling and downwelling in the deep ocean are significantly different when both parameters are allowed to covary and be spatially variable. These findings have important implications for the representation of oceanic heat, carbon, nutrients, and other tracer budgets in general circulation models.
Issue Date: 28-Dec-2019
Date of Acceptance: 3-Dec-2019
URI: http://hdl.handle.net/10044/1/91865
DOI: 10.1029/2019gl085056
ISSN: 0094-8276
Publisher: American Geophysical Union (AGU)
Start Page: 14622
End Page: 14633
Journal / Book Title: Geophysical Research Letters
Volume: 46
Issue: 24
Copyright Statement: ©2019. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: NE/P018319/2
Keywords: Meteorology & Atmospheric Sciences
Publication Status: Published
Online Publication Date: 2019-12-04
Appears in Collections:Civil and Environmental Engineering
Faculty of Engineering



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