Tidal flows, sill dynamics, and mixing in the Canadian Arctic Archipelago

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dc.contributor.author Hughes, Kenneth
dc.date.accessioned 2018-11-26T18:57:45Z
dc.date.available 2018-11-26T18:57:45Z
dc.date.copyright 2018 en_US
dc.date.issued 2018-11-26
dc.identifier.uri https://dspace.library.uvic.ca//handle/1828/10367
dc.description.abstract The transport of low-salinity waters through the Canadian Arctic Archipelago links the North Pacific, Arctic, and North Atlantic Oceans. This transport is influenced by many related small-scale processes including mixing, internal hydraulics, and internal tide generation. In this thesis, I quantify and elucidate the physics of such processes with aims of addressing discrepancies between observed and simulated fluxes through the Archipelago and advancing the skill of numerical models by identifying shortcomings and informing where and how progress can be achieved. To address the dearth of mixing rates across the network of channels, I first use a large-scale model to obtain baseline estimates of the spatial and seasonal variability of the vertical buoyancy flux. Much of the mixing occurs in the eastern half of the Archipelago and is attributed to the abundance of sills and narrow channels. Indeed, the so-called 'central sills area' is shown to be a mixing hot spot. I investigate this region further using high-spatial-resolution observational transects to examine the role of tides, which are excluded from the large-scale model. The many shallow channels here accelerate tidal currents and thereby induce strong bottom boundary layer dissipation. This is the largest energy sink within an observationally constrained energy budget. The generation of internal tides is another primary sink of barotropic tidal energy. Because the study site lies poleward of the critical latitudes of the dominant tidal constituents, internal tides propagate as internal Kelvin waves. Idealized, process-oriented modelling demonstrates that the amplitudes of such waves, or similarly the energy extracted from the barotropic tide, is sensitive to channel width because waves generated at each side of the channel interfere. Given the multiple connecting channels of the Archipelago, it is difficult to make a priori estimates of internal tide generation for a given channel. Nevertheless, the phenomenology I describe will be detectable in, and a requisite to understanding, pan-Arctic or global three-dimensional tidal models, which are becoming more prevalent. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject Canadian Arctic Archipelago en_US
dc.subject tides en_US
dc.subject sills en_US
dc.subject hydraulics en_US
dc.subject energy budget en_US
dc.subject Kelvin wave en_US
dc.subject tidal conversion en_US
dc.subject freshwater en_US
dc.title Tidal flows, sill dynamics, and mixing in the Canadian Arctic Archipelago en_US
dc.type Thesis en_US
dc.contributor.supervisor Klymak, Jody Michael
dc.degree.department School of Earth and Ocean Sciences en_US
dc.degree.level Doctor of Philosophy Ph.D. en_US
dc.description.scholarlevel Graduate en_US

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