UMD Theses and Dissertations

Permanent URI for this collectionhttp://hdl.handle.net/1903/3

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a given thesis/dissertation in DRUM.

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Author: search.filters.author.Hobbs, Edward AndrewSubject: search.filters.subject.flux

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    INVESTIGATING CONTROLS ON NITROUS OXIDE DISTRIBUTIONS AND AIR-SEA FLUX IN SHALLOW TIDAL WATERS USING AN EFFICIENT, NONTOXIC SAMPLING METHOD
    (2020) Hobbs, Edward Andrew; Testa, Jeremy M; Marine-Estuarine-Environmental Sciences; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Nitrous oxide (N2O) is a potent greenhouse gas that is naturally produced as a byproduct of nitrogen cycling. Eutrophication elevates nitrogen availability and enhances low-oxygen conditions, thus altering nitrogen cycling and associated N2O availability, but a knowledge gap persists regarding controls on N2O across estuarine environments. I studied three adjacent and nutrient-rich tidal tributaries of the Patapsco River (MD), one of which has engineered aeration (Rock Creek), to quantify how aeration and alterations to oxygen availability and nitrogen cycling will impact N2O production. In all creeks, N2O concentrations were above atmospheric levels and served as a source of N2O to the atmosphere. Oxygen and nitrate availability were most associated with variations in N2O concentrations, and N2O concentrations and air-water fluxes were highest in Rock Creek, especially during summer under non-aerated, but moderately oxygenated conditions. These new data help broaden our understanding of N2O cycling, availability, and distribution within estuarine ecosystems.