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  • The influence of early diagenesis on trace element and molybdenum isotope geochemistry

    Creator:
    Poulson, Rebecca L.
    Abstract:
    This thesis investigates the influence of early diagenesis on trace metal and molybdenum isotope behavior in marine and lacustrine environments. Chapter one is a synthesis of previous research in all the marine environments investigated, providing an essential geochemical context for interpreting the observed behavior of Mo in these settings. Chapter...
    Resource Type:
    Dissertation
    Full Text:
    James McManus This thesis investigates the influence of early diagenesis on trace metal and

  • Glacial to holocene watermass and continental weathering reconstructions from the Southeast Pacific

    Creator:
    Muratli, Jesse M.
    Abstract:
    Sediments of the central Chile margin record changes in ocean circulation and continental erosion associated with large–scale climate change. Here Antarctic– influenced Southern Ocean currents flow equatorward, forming a link between the high– and low–latitude oceans. Part of this link, Antarctic Intermediate Water, is an important conduit that ventilates South...
    Resource Type:
    Masters Thesis
    Full Text:
    the Southeast Pacific Abstract approved: James McManus Zanna

  • Influence of a Sedimentary Source of Nd on Deep Ocean εNd Distributions

    Creator:
    Abbott, April N.
    Abstract:
    Ocean circulation is an important component in Earth's climate system. Predicting future climate and circulation changes requires an improved understanding of the past relationship between climate and ocean currents. The neodymium isotope composition (εNd) of water masses is frequently used as a quasi-conservative tracer to reconstruct ocean circulation. The current...
    Resource Type:
    Dissertation

  • Contribution of cold seep barite to the barium geochemical budget of a marginal basin

    Creator:
    McQuay, Erica L.
    Abstract:
    Large barite (BaSO4) structures mark cold seeps in the southern San Clemente Basin. Barium flux to San Clemente sediments is two to three times greater than fluxes measured in surrounding California Borderland basins. Analyses of sediment trap material, water column samples, sediments and pore water indicate that expected bariumbearing mineral...
    Resource Type:
    Masters Thesis
    Full Text:
    McShane, who helped with sample processing. In addition to serving on my committee, Jim McManus

  • Understanding Molybdenum Isotope Dynamics in Terrestrial Environments

    Creator:
    King, Elizabeth K.
    Abstract:
    This dissertation works towards determining the mechanisms driving the Mo isotopic composition of soils, and how these signals may be used to refine the use of Mo as a proxy of biogeochemical processes. The first step towards quantifying Mo fractionation in soils is to determine the mechanisms controlling Mo accumulation,...
    Resource Type:
    Dissertation
    Full Text:
    defined by three sinks (McManus et al., 2006). Under oxic conditions, the removal of Mo from the

  • Utilization of natural and supplemental biofuels for harvesting energy from marine sediments

    Creator:
    Nielsen, Mark E.
    Abstract:
    A benthic microbial fuel cell (BMFC) is an electrochemical device that generates current from the redox gradient at the sediment-water interface. Early prototypes had anodes buried in anoxic sediments and cathodes in overlying water. The BMFCs described in this dissertation are based on a chamber design that enables the use...
    Resource Type:
    Dissertation
    Full Text:
    and Hong Liu provided helpful reviews of my manuscripts while Jim McManus and Jack Istok provided

  • Simulating past, present, and future changes in ENSO : a model evaluation and data-model comparison

    Creator:
    Alder, Jay R.
    Abstract:
    This thesis presents the results of a formal evaluation of a new AOGCM, GENMOM, demonstrating its ability to simulate present-day climate and ENSO dynamics. The model is applied to simulate climate for the Last Glacial Maximum, deglacial, and Holocene time periods. The model output is evaluated against the best available...
    Resource Type:
    Dissertation
    Full Text:
    Brook for joining my committee on such short notice and Jim McManus for serving as my GCR. Though

  • Unraveling the Diagenetic Cycling and Sequestration of Rare Earth Elements (REEs) in Marine Sediments to Understand REE Accumulation in Ancient Shales

    Creator:
    Yang, Jon
    Abstract:
    The rare earth elements (REEs) have been established as powerful tracers for a range of physiochemical processes occurring in the natural environment. They also hold significant economic importance as many technological advancements are reliant upon the REEs for their unique magnetic, luminescent, and electrochemical characteristics. In sedimentary settings, understanding the...
    Resource Type:
    Dissertation
    Full Text:
    Yang, Marta E. Torres, James McManus, Ji-Hoon Kim, and Jaime Toro 11

  • Great white mystery : learning from aquarium exhibits

    Creator:
    Wharton, James M.
    Abstract:
    In the summer of 2001 the Oregon Coast Aquarium opened a new exhibit on sharks entitled, "Great White Mystery: What Happened to Surfer Bob?" For the purposes of this study, a survey was designed to determine whether visitors to the new exhibit learned factual information or left with changed attitudes...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF James M. Wharton for the degree of

  • Interactions of a fully modulated inclined jet with a crossflow

    Creator:
    Dano, Bertrand P. E.
    Abstract:
    Jets in crossflow are used in a wide range of engineering applications and have been studied for more than 60 years. The transversal penetration and structure of a jet placed in a crossflow is known to be strongly three-dimensional. It is believed that, by using a pulsed jet inclined in...
    Resource Type:
    Dissertation
    Full Text:
    : Interactions of a Fully Modulated Inclined Jet with a Crgssflow. Abstract approved: James A. Liburdy Jets in