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  • 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...
    Resource Type:
    Dissertation
    Full Text:
    , and Firn Processes Abstract approved: Edward J. Brook The South Pole ice core (SPC14), drilled in

  • Stable Isotope Constraints on Carbon Dioxide and Nitrous Oxide Variations at the Onset of the Last Glacial Period: New Ice Cores from Taylor Glacier, Antarctica

    Creator:
    Menking, James A.
    Abstract:
    New ice cores retrieved from the Taylor Glacier (Antarctica) blue ice area contain ice and air spanning the Marine Isotope Stage (MIS) 5/4 transition, a period of global cooling and ice sheet expansion. Chronologies were determined for the ice and air bubbles in the new ice cores by visually matching...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Edward J. Brook New ice cores retrieved from the Taylor Glacier (Antarctica) blue ice

  • 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:
    approved: Edward J. Brook Methane is a product of biogeochemical processes which respond to changes in

  • Augmenting and interpreting ice core greenhouse gas records

    Creator:
    Rosen, Julia L.
    Abstract:
    The three studies that comprise this dissertation seek to answer significant questions in paleoclimatology through unconventional applications of ice core greenhouse gas data. These studies involve different gases and span the interval of time between the Last Glacial Maximum and the Industrial Revolution, but are united by their nontraditional use...
    Resource Type:
    Dissertation

  • 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...
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    Dissertation
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    Deglaciation Abstract approved: ____________________________________________________ Edward J

  • The late holocene atmospheric methane budget reconstructed from ice cores

    Creator:
    Mitchell, Logan E.
    Abstract:
    Ice cores are considered the gold standard for recording past climate and biogeochemical changes. However, gas records derived from ice core analysis have until now been largely limited to centennial and longer timescales because sufficient temporal resolution and analytical precision have been lacking, except during rare times when atmospheric concentrations...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Edward J. Brook Ice cores are considered the gold standard for recording past climate and

  • Cytokinin production by species of the fungus Taphrina

    Creator:
    Johnston, James Clelland
    Abstract:
    Chemically defined liquid media were devised which supported excellent growth of Taphrina cerasi and T. deformans. When grown in fermentation culture vessels, T. cerasi and T. deformans released cytokinins into the liquid media. The presence of these cell division factors was demonstrated with the soybean tissue assay which is specific...
    Resource Type:
    Dissertation
    Full Text:
    sincere appreciation to my major professor, Dr. Edward J. Trione, for his guidance and encouragement

  • Morphology, ultrastructure and mating of sporidia of a wheat-bunt fungus, Tilletia caries (DC.) Tul.

    Creator:
    Kollmorgen, James Frederick
    Abstract:
    The teliospore of Tilletia caries germinates to produce a promycelium with a whorl of primary sporidia at its tip. The time between emergence of the promycelium and the development of primary sporidia averaged 2.3 h. Fusion between compatible sporidia occurred within an additional 3.8 h. Primary sporidia appeared to be...
    Resource Type:
    Dissertation
    Full Text:
    ACKNOWLEDGEMENTS I wish to thank Dr. Edward J. Trione for his enthusiasm, stimu- lation and encouragement during