Transition from partly standing to progressive internal tides in Monterey Submarine Canyon

Hall, Rob A., Alford, Matthew H., Carter, Glenn S., Gregg, Michael C., Lien, Ren-Chieh, Wain, Danielle J. and Zhao, Zhongxiang (2014) Transition from partly standing to progressive internal tides in Monterey Submarine Canyon. Deep-Sea Research Part II: Topical Studies in Oceanography, 104. pp. 164-173. ISSN 0967-0645

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Abstract

Monterey Submarine Canyon is a large, sinuous canyon off the coast of California, the upper reaches of which were the subject of an internal tide observational program using moored profilers and upward-looking moored ADCPs. The mooring observations measured a near-surface stratification change in the upper canyon, likely caused by a seasonal shift in the prevailing wind that favoured coastal upwelling. This change in near-surface stratification caused a transition in the behaviour of the internal tide in the upper canyon from a partly standing wave during pre-upwelling conditions to a progressive wave during upwelling conditions. Using a numerical model, we present evidence that either a partly standing or a progressive internal tide can be simulated in the canyon, simply by changing the initial stratification conditions in accordance with the observations. The mechanism driving the transition is a dependence of down-canyon (supercritical) internal tide reflection from the canyon floor and walls on the depth of maximum stratification. During pre-upwelling conditions, the main pycnocline extends down to 200 m (below the canyon rim) resulting in increased supercritical reflection of the up-canyon propagating internal tide back down the canyon. The large up-canyon and smaller down-canyon progressive waves are the two components of the partly standing wave. During upwelling conditions, the pycnocline shallows to the upper 50 m of the watercolumn (above the canyon rim) resulting in decreased supercritical reflection and allowing the up-canyon progressive wave to dominate.

Item Type: Article
Uncontrolled Keywords: internal waves,internal tides,submarine canyons,usa,california,monterey bay
Faculty \ School: Faculty of Science > School of Environmental Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 05 Aug 2013 13:51
Last Modified: 21 Apr 2020 21:51
URI: https://ueaeprints.uea.ac.uk/id/eprint/43108
DOI: 10.1016/j.dsr2.2013.05.039

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