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  • High-frequency measurements of total CO₂ : Method development and first oceanographic observations

    Creator:
    Bandstra, Leah M.
    Abstract:
    As concern grows about the long-term effects of increasing atmospheric CO₂ concentrations, it becomes increasingly important to understand the cycling of carbon on Earth, particularly in the dynamic marine reservoir. Gas exchange and relatively rapid ocean mixing times mean that the oceans play a significant role in determining the atmospheric...
    Resource Type:
    Masters Thesis
    Full Text:
    ............................................................................. 43 A4. Carbon content of salts used to prepare artificial seawater ............. 44 B 1. Data for

  • Insights from stable isotope dynamics into the sensitivity of larval Pacific oysters to ocean acidification

    Creator:
    Brunner, Elizabeth Lev
    Abstract:
    Larvae of the Pacific Oyster, Crassostrea gigas, at Whiskey Creek Shellfish Hatchery (WCH) in Netarts Bay, Oregon, are negatively impacted by high-CO₂ water and exposure during the initial shell formation period appears to be particularly damaging. To investigate the mechanism of this early susceptibility, several cohorts of larvae at WCH...
    Resource Type:
    Masters Thesis
    Full Text:
    carbon faster than organic nitrogen. Shell carbon isotopes of all cohorts show a decreasing dependence

  • Seagrasses as Potential Chemical Refugia for Acidification-Sensitive Bivalves

    Creator:
    Smith, Stephanie Rae
    Abstract:
    As the effect of ocean acidification (OA) on marine calcifiers is better understood, a range of potential mitigative strategies have been proposed, many of which are plagued by concerns of scale and feasibility. One oft-cited option is to increase the biomass of photosynthetic organisms to remove CO₂ from the water...
    Resource Type:
    Masters Thesis
    Full Text:
    Acidification, 2012, Hendriks et al. 2014). Seagrasses are known to draw down water column carbon dioxide

  • Method report for total organic carbon measurements GEOSECS

    Creator:
    Gordon, Louis Irwin, 1928-, Barstow, L., Lilley, M., Seifert, E. A., and Park, P. K.
    Abstract:
    The analytical method employed for the Total Organic Carbon (TOC) project in the Geochemical Ocean Sections Study (GEOSECS) is described in detail. The method generally follows that of Menzel and Vaccaro as modified by several subsequent workers including the GEOSECS group at Oregon State University which carried out the TOC...
    Resource Type:
    Technical Report
    Full Text:
    purging the inorganic carbon dioxide. Completion of the oxidation, measurement, and data reduc- tion was

  • Remineralization of marine particulate organic matter

    Creator:
    Burkhardt, Brian Gary
    Abstract:
    Marine microorganisms play a significant role in the cycling of nutrients in the open ocean through production, consumption, and degradation of organic matter (OM). Carbon (C), nitrogen (N), and phosphorus (P) are essential ingredients in every known recipe for life. However, the cycling of each of these elements proceeds at...
    Resource Type:
    Masters Thesis
    Full Text:
    ). Carbon (C), nitrogen (N), and phosphorus (P) are essential ingredients in every known recipe for life

  • Metabolism of one carbon (C1) and methylated compounds in SAR11 bacteria

    Creator:
    Sun, Jing
    Abstract:
    SAR11 Alphaproteobacteria are the most abundant aerobic chemoheterotrophs in ocean surface waters. Previous studies have indicated SAR11 cells play an important role in marine carbon cycling and consume up to half of some common dissolved organic compounds, such as amino acids. During sequencing of the first SAR11 genome, genes for...
    Resource Type:
    Dissertation
    Full Text:
    seawater. However, they represent a potentially important, underexplored component of the carbon cycle

  • Distinguishing biological and physical controls on soil respiration

    Creator:
    Phillips, Claire L.
    Abstract:
    Soil respiration, or the combined CO₂ emissions from roots and soil microorganisms, constitutes one of the largest losses of carbon (C) from terrestrial ecosystems. The major drivers of soil respiration, which include soil moisture, temperature, and substrate quality, have been known for some time. Nevertheless, correlations between these drivers and...
    Resource Type:
    Dissertation
    Full Text:
    Carbon Dioxide Efflux and Concentration. Soil Sci Soc Am J, 67, 402-413. Risk D, Kellman L, Beltrami H

  • Pacific Northwest rangeland carbon sequestration

    Creator:
    Wiggins, Seth T.
    Abstract:
    This paper models the supply curve of carbon sequestration on Pacific Northwest rangelands. Rangeland managers have the ability to sequester carbon in agricultural soils by implementing alternative management practices on their farms. Their low adoption rate in practice suggests a high opportunity cost associated with their implementation. To increase their...
    Resource Type:
    Masters Thesis
    Full Text:
    . Alternative land management practices that sequester carbon dioxide in agricultural soils would modify

  • Spatiotemporal dynamics and drivers of stream pCO₂ in a headwater mountain catchment in the Cascade Mountains, Oregon

    Creator:
    Dosch, Nicholas T.
    Abstract:
    We examined the spatial and temporal variability of stream carbon dioxide (CO₂) and the drivers of these variations in a headwater catchment. To examine temporal variation and drivers, we measured stream and hyporheic pCO₂ at high temporal resolution over 11 months in a 95.9-ha forested headwater catchment in the Western...
    Resource Type:
    Masters Thesis
    Full Text:
    stream pCO2 and stream discharge, mean velocity and the carbon dioxide gas transfer velocity. Stream

  • Essays on land-use change, carbon sequestration and emissions in China

    Creator:
    Li, Man
    Abstract:
    China has experienced rapid economic growth in the last twenty years, accompanied by large-scale land conversion, severe environmental degradation, and rising carbon dioxide (CO₂) emissions. Designing policies for sustainable development requires a comprehensive understanding of the relationship between economic growth, land-use change, carbon sequestration and emissions in China. This dissertation...
    Resource Type:
    Dissertation
    Full Text:
    degradation, and rising carbon dioxide (CO2) emissions. Designing policies for sustainable development