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  • Understanding the anodic mechanism of a seafloor fuel cell

    Creator:
    Ryckelynck, Natacha
    Abstract:
    Anoxic sediment overlain by oxic seawater establishes a voltage gradient on the order of 0.7-0.8V across the sediment-water interface. This study follows Reimers et al. (2001) and Tender et al. (2002) who reported the development of a seafloor fuel cell to harvest electrical energy from this potential difference. Prototype fuel...
    Resource Type:
    Masters Thesis
    Full Text:
    ) and sediment from further above in the sediment column (dark)..... 10 4. Picture of the two chambers

  • Growth rates and species composition of juvenile rockfish (Sebastes spp.) in Oregon’s nearshore and estuarine habitats

    Creator:
    Gallagher, M. Brett
    Abstract:
    Identification of critical habitat for all life stages of commercially exploited fish populations is critical for effective management. Despite a clear need for basic biological information on juvenile rockfish life history, there have been very few efforts to describe distribution and habitat of this life stage, particularly along the Oregon...
    Resource Type:
    Masters Thesis
    Full Text:
    habitat is listed as common for juveniles of this species. Blue rockfish settlement was detected from

  • Ecosystem Photosynthesis and Forest-Atmosphere Interactions Inferred from Carbonyl Sulfide

    Creator:
    Rastogi, Bharat
    Abstract:
    An increase in anthropogenic activities since the industrial revolution, primarily due to burning of fossil fuels and changes in land cover, has resulted in a steady increase in the global mean atmospheric CO2 concentrations. While there is unequivocal scientific evidence on global warming and its multidimensional impacts on natural and...
    Resource Type:
    Dissertation
    Full Text:
    ) the ratio of transpiration scaled using sap flow data to evapotranspiration estimates from latent

  • West Nile virus : forecasting models for a resurging vector-borne disease in Arizona, U.S.A.

    Creator:
    Roldan, Josiah Javier
    Abstract:
    West Nile Virus (WNV), a vector-borne disease continues to be a serious threat to public health in the United States, particularly in the Southwest region. While all the states in the U.S. experienced a decreasing trend of WNV disease in 2010, the state of Arizona experienced a sharp increase from...
    Resource Type:
    Dissertation
    Full Text:
    historical data. The model-based inference identified counties in the southern region of Arizona as having

  • Use of benthic sediments as indicators of marina flushing

    Creator:
    Noble, Scott Morgan
    Abstract:
    This report presents the findings of a sediment analysis program formulated to determine the flushing potential of various shaped small boat marina basins. Chemical tests regarding volatile solids, Kjeldahl nitrogen, grease and oil, and sulfides were performed with the results compared to established sediment quality criteria. These results were used...
    Resource Type:
    Masters Thesis
    Full Text:
    to established sediment quality criteria. These results were used to estimate the relative state of

  • Paleoclimate, paleoventilation, and paleomagnetism as recorded in a 17kyr marine sediment record from the SE Alaska margin

    Creator:
    Davies, Maureen Helen
    Abstract:
    The deglacial behavior of the sub-Arctic North Pacific is poorly constrained, with many published records suffering from limited age control due to extensive post- depositional biogenic carbonate dissolution. Potential alternative dating methods could include the correlation of stable-isotopic and/or paleomagnetic secular variation records to an independently-dated regional template, however no...
    Resource Type:
    Dissertation
    Full Text:
    variability from a single location, as well as to place observations of Northeast Pacific paleoclimate and

  • Evaluating the public health risks of methylmercury exposure and benefits from omega-3 fatty acids and selenium from fish consumption

    Creator:
    Cusack, Leanne K.
    Abstract:
    Although fish are a nutritious food source, they also are the main source of methylmercury exposure in U.S. populations. This research examined the risks from methylmercury and benefits from omega-3 fatty acids and selenium from fish consumption. The first study provided the first region-specific quantitative risk/benefit analysis for nine commonly...
    Resource Type:
    Dissertation
    Full Text:
    Harper provided substantial contributions to the conception, design and interpretation of the data as

  • 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
    Full Text:
    data, reconciles the non-linear relationship between CO2 and δ13C of CO2 from the Last Glacial Maximum

  • Analyzing large paleoclimate datasets : implications for past and future climate change

    Creator:
    Shakun, Jeremy D.
    Abstract:
    This dissertation presents the results of statistical analyses of large climate datasets from two time intervals – the 20th century instrumental record and the proxy record of the last deglaciation – in order to understand the forcings and mechanisms of past climate variability. A longstanding question in climate dynamics concerns...
    Resource Type:
    Dissertation
    Full Text:
    as a student of his own and develop a research project with me. I also benefited considerably from

  • Quantitative Tools for Monitoring Strategy Evaluation and Assessment of Sea Turtle Populations

    Creator:
    Piacenza, Susan E. H.
    Abstract:
    Green sea turtles, Chelonia mydas, have endangered and threatened populations globally, but several populations show signs of population recovery. In Hawaii, nesting female green turtles have increased 5.7% year⁻¹ since 1973, but wide fluctuations in census counts of nesting females make recovery diagnosis difficult. For effective management planning, it is...
    Resource Type:
    Dissertation
    Full Text:
    assessments from nesting beach data alone is likely to result in incorrect or biased estimates of status