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Filtering by: Creator Ehrlicher, Sarah E. Remove constraint Creator: Ehrlicher, Sarah E. Academic Affiliation College of Earth, Ocean, and Atmospheric Sciences Remove constraint Academic Affiliation: College of Earth, Ocean, and Atmospheric Sciences Resource Type Dissertation Remove constraint Resource Type: Dissertation

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  • From Micro to Macro: Insights into Biogeochemical Mechanisms that Shape Marine Systems

    Creator:
    Seabrook, Sarah
    Abstract:
    Biogeochemical mechanisms employed by key organisms, or symbiotic associations of organisms, transform the function and structure of their environment through processes recognized as ecosystem engineering. This dissertation seeks to investigate organism-ecosystem interactions that serve globally significant ecological functions in marine systems and impact how systems respond to environmental change. Using...
    Resource Type:
    Dissertation
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    DISSERTATION OF Sarah Seabrook for the degree of Doctor of Philosophy in Ocean, Earth, and Atmospheric

  • Deep-sea sediment paleomagnetism : a case study from the North Atlantic

    Creator:
    Strano, Sarah Elianna
    Abstract:
    Sedimentary records from the North Atlantic, instrumental in the development of modern paleo-geomagnetic concepts, show a highly variable field even during times of constant polarity. Yet, our understanding of how the magnetization is acquired in the sediments is poorly understood. Primary magnetizations preserved in deep-sea sediments are known to be...
    Resource Type:
    Dissertation
    Full Text:
    THE DISSERTATION OF Sarah Elianna Strano for the degree of Doctor of Philosophy in Earth, Ocean and

  • Modeling Forest Response to Changing Climate Conditions in Western North America

    Creator:
    Hawkins, Linnia R.
    Abstract:
    Forests play an integral role in the global carbon cycle, regulating the atmospheric CO₂ concentration by sequestering nearly one third of anthropogenic carbon emissions and storing carbon for centuries. Forest ecosystems are integrated into the culture, ecology, and economy of western North America, supporting wildlife habitat, local economies, recreation, and...
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    Dissertation
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    drafted the paper. Dr. Doug McNeall provided guidance and code for the analysis and Dr. Sarah Sparrow

  • The Effects of the Flow Regime on Stream Channel Form and Processes

    Creator:
    Hempel, Laura A.
    Abstract:
    Numerous studies have explored how alluvial channel size and morphology are adjusted to different sediment and flow conditions, yet we still know very little about how and to what degree the flow regime controls channel form and processes. We use the term ‘channel form’ to refer to the size and...
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    Dissertation
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    : ______________________________________________________ Gordon E. Grant Numerous studies have explored how alluvial channel size and morphology

  • Investigating Influences of Natural and Anthropogenic Lead Sources on Environmental Archives at Multiple Spatial and Temporal Scales: Evidence from Oysters and Ice Cores

    Creator:
    Wensman, Sophia M.
    Abstract:
    Environmental archives provide records of natural and anthropogenic variation in the environment at different temporal and spatial scales. Lead (Pb) concentrations and isotopic ratios are useful tracers of anthropogenic emissions from industrial activities including mining, smelting, and leaded gasoline use, however, methods of measuring Pb are largely limited in low...
    Resource Type:
    Dissertation
    Full Text:
    Alyssa E. Shiel Environmental archives provide records of natural and anthropogenic variation in

  • A stratigraphic approach to characterize the deposition and storage of organic matter in reservoir sediments

    Creator:
    Stratton Garvin, Laurel E.
    Abstract:
    The relationship between carbon burial and sedimentation in reservoirs is unknown, exposing gaps in our fundamental understanding of the transport, processing, and deposition of sediment and organic matter in fluvial and lacustrine systems and contributing to uncertainty in our understanding of the net impact of dams to the global carbon...
    Resource Type:
    Dissertation
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    AN ABSTRACT OF THE DISSERTATION OF Laurel E. Stratton

  • Large Ensembles of Regional Climate Simulations over the western United States

    Creator:
    Li, Sihan
    Abstract:
    Large ensembles of regional climate simulations were generated from the weather@home distributed volunteer computing project over the western US domain. Weather@home uses the U.K. Met Office Hadley Centre’s regional climate model HadRM3P (~0.22°) nested within the atmospheric global model HadAM3P (1.875 longitude° by 1.25 latitude°). Simulations from HadRM3P were evaluated...
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    Dissertation
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    up the experiment and Sarah Sparrow assisted in generating the model simulations used in Chapter3

  • Mapping Wildlife-Relevant Snow Properties in Arctic-Boreal North America; Novel Modelling, Remote-Sensing, and Ground Observation Approaches

    Creator:
    Cosgrove, Christopher Liam
    Abstract:
    Arctic-boreal regions are exhibiting the symptoms of profound ecological shifts as they experience pronounced warming. Wildlife in high-latitudes are one such harbinger of change, and their populations are undergoing range-shifts, declines, and extinctions in response to their rapidly altering habitats. As the circumpolar and boreal north is snow-covered for up...
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    Dissertation
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    -cabins to me - lifestyles and homes I envy hugely. Thanks too, to Sarah Sackett at the ABoVE logistics

  • Insights into Centennial-Scale Salt Marsh Morphodynamics from the Oregon Coast

    Creator:
    Peck, Erin K.
    Abstract:
    Quantification and comparison of morphological changes over the last ~300 y in Oregon salt marshes provide valuable insights into the tectonic, hydroclimatic, and anthropogenic processes shaping this important intertidal zone. Understanding of the rates and drivers of salt marsh change contextualizes intertidal habitats within the sediment routing system (i.e., source...
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    Dissertation
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    had with Sarah Kolesar, Shelby Walker, and Stephanie Ichien. I have additionally received funding

  • Understanding Signals of the South Pole Ice Core: Chronology, Climate, and Firn Processes

    Creator:
    Epifanio, Jenna A.
    Abstract:
    The South Pole ice core (SPC14), drilled in the field seasons of 2014/2015 and 2015/2016, is an intermediate length, 1,751-m ice core which preserves a 54,000-year record of past climate and atmospheric composition. The SPC14 ice core adds to the spatial grid of ice cores in Antarctica extending into the...
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    Dissertation
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    also compare the observed variability to that found in a 400-year GISS Model E Earth System Model run