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Physical processes and biogeochemistry of particle fluxes over the Beaufort slope and in Canada Basin

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dc.contributor.author O'Brien, Mary C.
dc.date.accessioned 2009-08-28T20:17:20Z
dc.date.available 2009-08-28T20:17:20Z
dc.date.copyright 2009 en
dc.date.issued 2009-08-28T20:17:20Z
dc.identifier.uri http://hdl.handle.net/1828/1669
dc.description.abstract Sedimentation rates and compositions of sinking particles were investigated at three sites on the Beaufort slope and one in Canada Basin during the period 1990-1994 using moored sequential sediment traps. A method was developed to identify the terrigenous and biogenic components of the fluxes. The physical context including ice cover, ocean currents, river inputs, winds, air temperature, incident light, and nutrient availability provide essential information to the interpretation of the particle fluxes and to the understanding of shelf-basin sediment transport in this area. Eddies, internal waves, upwelling and downwelling, and the state of the ice cover all played important and overlapping roles in the pattern of observed fluxes. A peak in the flux of highly terrigenous material under complete ice cover in mid-winter to the northwest of Mackenzie Trough was associated with predominantly downwelling conditions and the passage of a series of eddies and internal waves. A prolonged spring diatom bloom occurred in the mid-slope area and was clearly associated with an early opening of the ice on the east side of the shelf. Higher fluxes at the Canada Basin site were associated with a large eddy clearly identifiable from the current-T-S record and also from the composition of the suspended material carried with it. At the base of the slope (2700 m), the composition was highly terrigenous and remarkably consistent. Higher up the slope (700 m), biogenic peaks in the summer diluted the terrigenous material briefly, but it appears that there is a constant background of highly terrigenous material. There was a high degree of variability between sites and over the slope there was not enough data to asses the inter-annual variability. In Canada Basin, the inter-annual variability was closely linked to the extent of open water in the summer period. At all sites, lateral transport is clearly indicated by the increase in flux with depth. The data robustly demonstrate the need for detailed knowledge of physical processes for informed interpretation of particle fluxes and sediment transport in this area. en
dc.language English eng
dc.language.iso en en
dc.rights Available to the World Wide Web en
dc.subject Arctic en
dc.subject shelf en
dc.subject sediment trap en
dc.subject sediment en
dc.subject particulate en
dc.subject transport en
dc.subject flux en
dc.subject terrigenous en
dc.subject biogenic en
dc.subject carbon en
dc.subject nitrogen en
dc.subject silica en
dc.subject aluminum en
dc.subject isotope en
dc.subject d13C en
dc.subject d15N en
dc.subject eddies en
dc.subject eddy en
dc.subject upwelling en
dc.subject downwelling en
dc.subject internal waves en
dc.subject shelf-basin en
dc.subject biological production en
dc.subject diatom en
dc.subject bloom en
dc.subject ice-edge en
dc.subject resuspension en
dc.subject currents en
dc.subject temperature en
dc.subject salinity en
dc.subject nutrients en
dc.subject resuspension en
dc.subject nepheloid en
dc.subject.lcsh UVic Subject Index::Sciences and Engineering::Earth and Ocean Sciences::Biogeochemistry en
dc.subject.lcsh UVic Subject Index::Sciences and Engineering::Earth and Ocean Sciences::Environmental sciences en
dc.subject.lcsh UVic Subject Index::Sciences and Engineering::Earth and Ocean Sciences::Geochemistry en
dc.subject.lcsh UVic Subject Index::Sciences and Engineering::Earth and Ocean Sciences::Oceanography en
dc.title Physical processes and biogeochemistry of particle fluxes over the Beaufort slope and in Canada Basin en
dc.type Thesis en
dc.contributor.supervisor Pedersen, Thomas F.
dc.contributor.supervisor Macdonald, Robie Wilton
dc.degree.department School of Earth and Ocean Sciences en
dc.degree.level Master of Science M.Sc. en


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