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  • Ocean Temperature Variability during the Late Pleistocene

    Creator:
    Hoffman, Jeremy Scott
    Abstract:
    This dissertation explores one overarching question relevant to the paleoclimate of the latest Pleistocene glacial cycle (approximately the last 130,000 years): “How did spatial and temporal evolution of ocean temperature, both at the surface and interior, relate to other parts of the climate system in the late Pleistocene?” Results from...
    Resource Type:
    Dissertation
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    seek to address longstanding questions in paleoceanography and paleoclimatology for the late

  • Optics, structure and variability of the offshore Columbia River plume

    Creator:
    Saldías, Gonzalo
    Abstract:
    The Columbia River delivers the greatest amount of freshwater to the coastal ocean along the U.S. Pacific coast. This freshwater forms the Columbia River plume, a mesoscale plume with significant implications on coastal ocean physical, biological, chemical, and geological processes. The plume is transported south and offshore during the upwelling...
    Resource Type:
    Dissertation
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    emphasis on the cross-shore structure off central Oregon, and its variability in response to wind forcing

  • Carbon cycle variability during the last millennium and last deglaciation

    Creator:
    Bauska, Thomas K.
    Abstract:
    The exchange of carbon on earth is one of the fundamental processes that sustains life and regulates climate. Since the onset of the Industrial Revolution, the burning of fossil fuels and anthropogenic land conversion have altered the carbon cycle, increasing carbon dioxide in the atmosphere to levels that are unprecedented...
    Resource Type:
    Dissertation
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    changed in the past. Key constraints on past carbon cycle variability come from the concentration and

  • Regional scale sandbar variability : observations from the U.S. Pacific Northwest

    Creator:
    Di Leonardo, Diana R.
    Abstract:
    Understanding sandbar dynamics and variability is integral to developing a predictive capacity for nearshore flows, sediment transport, morphological change, and ultimately for determining coastline exposure to damaging storm waves. Along the high-energy U.S. Pacific Northwest (PNW) coast, sandbars typically dominate the bathymetry of the active zone. Here we report on...
    Resource Type:
    Masters Thesis
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    attempt to explain the inter-littoral cell variability via trends and variability in environmental

  • Coastal ocean variability inferred from high resolution models : two case studies

    Creator:
    Mauch, Matthew L.
    Abstract:
    In this thesis, high resolution ocean models are used to evaluate and forecast coastal ocean variability in two different applications. In the first study, the 2-km resolution ocean circulation model for the Eastern Bering Sea is utilized to understand whether slope-interior exchange along the path of the Aleutian North Slope...
    Resource Type:
    Masters Thesis
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    mean circulation and seasonal and interannual variability in the volume transports, heat fluxes, ice

  • A 37,000-year record of paleomagnetic and environmental magnetic variability from Burial Lake, Arctic Alaska

    Creator:
    Dorfman, Jason Michael
    Abstract:
    Burial Lake sediments from the Noatak Basin in the northwest Brooks Range of Arctic Alaska (68.43°N, 159.17°W, 21.5 m water depth) provide the oldest continuous lacustrine record of paleo-environmental change and paleomagnetic secular variation (PSV) in eastern Beringia. A precise radiocarbon chronology, determined through accelerator mass spectrometry (AMS) allows us...
    Resource Type:
    Masters Thesis
    Full Text:
    Paleomagnetic and Environmental Magnetic Variability from Burial Lake, Arctic Alaska Abstract approved

  • Horizontal Variability of Internal Waves and Tides: Seafloor Pressure Measurements and Idealized Resonant Modes

    Creator:
    Thomas, Jennifer A.
    Abstract:
    Internal waves and tides are a dominant source of current variability, and they are intermittent and hard to predict. Internal waves can have significant variability in alongshore structure. However, previous studies on internal waves have focused primarily on their cross-shore structure and propagation. For example, while alongshore-propagating superinertial internal tides...
    Resource Type:
    Dissertation
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    variability in propagation speed, direction, and kinetic energy of packets of high-frequency nonlinear

  • The Responses of Slope-spawning Flatfish to Environmental Variability in the Eastern Bering Sea

    Creator:
    Vestfals, Cathleen D.
    Abstract:
    When adult spawning and juvenile settling locations of marine fishes are geographically separated, their early life history stages must rely on transport and their own behavior to move them toward suitable habitats for successful recruitment to the juvenile phase. Variations in climate may reduce the availability of spawning and juvenile...
    Resource Type:
    Dissertation
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    Pribilof canyons. Variability in transport and the BSC position was strongly influenced by winds, ice

  • The Role of Iron: How Natural and Human-Induced Iron Fertilization Could Change Ocean Productivity

    Creator:
    Adroli, Nurmalia
    Abstract:
    Iron (Fe) is an important limiting nutrient that can affect the rate of ocean primary production because it is required by phytoplankton as an enzymatic cofactor in photosynthesis, nitrogen fixation, and other essential metabolic functions. Most Fe reaches the surface of the open ocean via atmospheric dust deposition, which is...
    Resource Type:
    Masters Thesis
    Full Text:
    how changes in natural and human-induced Fe inputs may contribute to enhancing or mitigating climate

  • Geochemical and Geostatisical Analyses of Quaternary Climate Variability over Millennial-to-Orbital Timescales

    Creator:
    Barth, Aaron M.
    Abstract:
    The goal of dissertation research was to use geochemical, statistical and geological methods to constrain and understand climate variability over several different time scales. Specifically, I have addressed three questions regarding past climate change: (1) how does the record of Irish cirque glaciers constrain the dimensions of the Irish Ice...
    Resource Type:
    Dissertation
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    ) what is the record of millennial-scale glacier variability in Ireland during the last glaciation; and