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  • Application of transport-reaction modeling to constrain biogeochemical processes in marine sediments

    Creator:
    Hong, Wei-Li
    Abstract:
    Quantifying the mass transport through marine sediments, and the geochemical response to such flow with numerical models has become a common and powerful approach for geochemical data interpretation. In this dissertation, I developed and applied transport-reaction models to unravel complex and interdependent reactions involving carbon, sulfur and silica transformations in...
    Resource Type:
    Dissertation
    Full Text:
    rates estimated by the box model (Hong et al., 2013) and the current kinetic model

  • Assessing the role of reactive metal species in soil organic matter cycling using chemical imaging

    Creator:
    Keiluweit, Marco
    Abstract:
    Intimate associations with reactive metal species permanently protect soil organic matter (SOM) from microbial access and oxidation, contributing to the build-up of organic carbon (C) stocks in soils. It is increasingly recognized, however, that such associations can be reversible and that reactive metal species might even facilitate the oxidation of...
    Resource Type:
    Dissertation
    Full Text:
    Geochimica et Cosmochimica Acta Elsevier Inc. 1600 John F Kennedy Boulevard Suite 1800 Philadelphia PA

  • 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:
    climate change (Frank et al., 2010) and the role early anthropogenic land-use change (Ruddimann, 2003

  • 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:
    energy transfer than the sum of all multicellular organisms (Pomeroy et al., 2007). In the photic

  • 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:
    pore size of 0.45 microns, though 0.22 micron filters have also been used to quantify DOC (Gao et al