Memorial University Research Repository

The Memorial University Research Repository is an open access initiative to showcase and preserve Memorial University's creative and intellectual output, including theses, journal articles, conference papers, lectures, presentations, reports, and performances.

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Recent Submissions

Access status: Open Access ,
Cool Things We Catalogued: Preáchán by Sarah Lewis
(Memorial University of Newfoundland, 2026) Maston, SK
Access status: Open Access ,
Evaluating sustained ocean monitoring using underwater gliders in Canada
(Fisheries and Marine Institute, 2025-06) Cyr, Frederic; Ross, Tetjana; Tran, Anh; Hebert, David; Richards, Clark
Ocean monitoring carried out by governmental agencies is instrumental to understand marine ecosystems dynamics, especially in a time of rapid environmental changes. In Canada, Fisheries and Oceans Canada, the federal agency responsible for safeguarding Canada’s three ocean basins, has been using ocean gliders for ocean monitoring purposes since 2018, following significant investment in new technologies starting in 2016. Ocean gliders are autonomous underwater vehicles capable of acquiring a suite of valuable environmental information, from the ocean surface down to 1,000 m depth, along standardized monitoring sections on Canada’s East and West coasts. This information is used by multiple organizations to sustain both national and international programs. This paper outlines the progress and realization made at DFO regarding the glider technology and its use for monitoring the ocean in Canada. This paper includes an overview of the glider technology, the identification of clients, an overview of current glider activities, and the challenges. The requirements for data management and dissemination are also discussed as well as potential extensions to the program. Reflections are also made on the resources needed to operate a sustainable national glider program in Canada to monitor the ocean. The information contained here may serve as a baseline to plan other sustained glider monitoring programs in the world.
Access status: Open Access ,
Female and Gender-Diverse Mentorship Program
(Fisheries and Marine Institute, 2026-04) Fudge, Shelby; White, Georgina
Access status: Open Access ,
Rock-physics-guided parameterization for efficient Monte Carlo full waveform inversion in CO2 sequestration
(Society of Exploration Geophysicists, 2026-03-17) Mohammadi, Abolfazl Khan; Malcolm, Alison; Farquharson, Colin
Seismic full waveform inversion (FWI) is a powerful tool for monitoring subsurface changes during carbon capture and storage (CCS) operations, but its ill-posed nature makes uncertainty quantification (UQ) essential for reliable interpretation. Sampling-based Bayesian methods such as Markov chain Monte Carlo (McMC) provide rigorous UQ but are computationally demanding. In conventional FWI, elastic properties are assigned to densely discretized space-filling cells, resulting in a high-dimensional parameterization that makes large-scale elastic FWI computationally infeasible. To address this challenge, we propose a rock-physics-guided parameter-reduction strategy that compactly represents the CO2 plume geometry using cubic splines controlled by a limited number of nodes. This parsimonious parameterization not only significantly reduces the number of model parameters and the forward simulations required for an effective UQ using sampling methods but also has the potential to improve the practicality and efficiency of other types of UQ methods. Numerical experiments on a cross-well synthetic scenario and a field-scale case based on the Aquistore storage site in Saskatchewan, Canada, demonstrate that the method efficiently reconstructs the plume shape and its extent and that it converges to consistent posterior distributions across multiple Markov chains.
Access status: Open Access ,
Geological characterization of the Aurora hydrothermal vent field, Gakkel Ridge
(Memorial University of Newfoundland, 2026-02) Lapointe, Charles; Jamieson, John W.; Piercey, Stephen
The Aurora hydrothermal vent field is located on Gakkel Ridge, an ultraslow-spreading mid-ocean ridge in the Arctic Ocean, in a region of perennial sea-ice cover. Previous expeditions to Aurora revealed high-temperature black smoker chimneys on pillow basalts near an axial volcano summit, but challenges operating in drifting sea ice prevented detailed exploration and sampling of the site. The hydrothermal vents were imaged in detail for the first time during the 2021 HACON expedition, and rock sampling of three active vents and adjacent hydrothermal talus by remotely operated vehicle marked the first successful geological exploration of a hydrothermal field under ice. This study provides a geological characterization of Aurora using video footage and mineralogical and geochemical analyses of hydrothermal rock samples. While situated on mafic substrate, the hydrothermal precipitates contain Ni-Co sulfide minerals and low Si, Pb, and Ba concentrations, characteristics of ultramafic rock-influenced vent fields on slow-spreading ridges. Chimney structures are unusually thin and friable, lacking many of the lowtemperature minerals commonly found in other deposits. The results are discussed in the context of the poorly explored Gakkel Ridge, with implications for future interdisciplinary exploration of hydrothermal systems and for seafloor massive sulfide mineral potential in the Arctic.