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  • Interpreting Climate of the Past from High-Resolution Ice Core Records of Methane

    Creator:
    Lee, James E.
    Abstract:
    Methane is a product of biogeochemical processes which respond to changes in climate. The history of atmospheric methane is recorded by ice cores providing insight into past changes in these biogeochemical processes. This dissertation is comprised of three studies which focus on centennial- and millenial-scale variability of methane from ice...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF James E. Lee for the

  • Investigating the Paleoseismic Potential of Small, Southern Cascadia Lakes

    Creator:
    Ross, Ann Elizabeth Morey
    Abstract:
    Marine and coastal sedimentary archives show that the Cascadia Subduction Zone can generate great earthquakes of ~M9, most recently in 1700 CE, yet we still know little of the impacts of these events inland of the Pacific coast. Inland lakes have recently been exploited for their use as paleoseismic records...
    Resource Type:
    Dissertation
    Full Text:
    . E. Morey, C. Goldfinger, C. E. Briles, D. G. Gavin, D. Colombaroli, and J. E. Kusler

  • 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
    Full Text:
    darkest. To my undergraduate mentees, Elia de Jesus and Zoe E. Brown: thank you for putting in hours

  • The Ocean Circulation and Carbon Cycle during the Last Glacial Maximum

    Creator:
    Muglia, Juan
    Abstract:
    During the Last Glacial Maximum (LGM, ∼ 21 ky before present) the atmospheric CO2 concentration was about 100 ppm lower than its pre-industrial (PI)value. The missing carbon from the atmosphere must have been stored in thedeep ocean during this period, but the mechanisms driving such re-distribution ofthe carbon cycle are...
    Resource Type:
    Dissertation
    Full Text:
    fluxes for (d) PI, and (e) LGM (LGM Fe simulation). Bottom maps are hydrothermal fluxes, corresponding to

  • Dynamics of the Laurentide Ice Sheet

    Creator:
    Carlson, Anders Eskil
    Abstract:
    This dissertation concentrates on the controlling factors on the instability of the Laurentide Ice Sheet (LIS) and their effects on abrupt climate change. Northern Hemisphere climate fluctuated abruptly during the last deglaciation possibly related to variability in Atlantic meridional overturning circulation (AMOC) and reduced aerial extent of the LIS. Reductions...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Anders E. Carlson for the degree of Doctor of Philosophy in

  • 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:
    , 26.965 ka), Subunit 2 (E: 190 cm, 13.526 ka), and Subunit 3 (A: 40 cm, 2.331 ka

  • Past climate variability in southwestern Oregon and relationships with regional and hemispheric climate

    Creator:
    Ersek, Vasile
    Abstract:
    This dissertation presents the results of three studies that assessed climate variability on short and long timescales in western United States. The growth of carbonate formations in caves (speleothems) is used to infer the timing and amplitude of past climate variability. We first assess the controls on speleothem growth for...
    Resource Type:
    Dissertation
    Full Text:
    in frozen soil water during the LGM (Fig. 2.5 E). The reduction in liquid water in part reflects