Methane variability associated with natural and anthropogenic sources in an Australian context

M. A. Hatch*, M. J. Kennedy, M. W. Hamilton, R. A. Vincent

*Corresponding author for this work

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Coal seam gas (CSG) has the potential to be a low-carbon transition fuel, but CSG fields may be a source of fugitive emissions of methane (CH4). We use mobile cavity ring-down spectroscopy (CRDS) measurements to attribute CH4 concentrations to sources in southeastern Australia including CSG fields. Our study shows higher CH4 concentration values associated with both natural and anthropogenic sources other than CSG. These include urban landfills (>320 ppm) and urban infrastructure (>17 ppm), agricultural activities (>20 ppm) and open-pit coal mines (>30 ppm). We confirm reports of increased concentration of CH4 downwind of some parts of CSG fields (<5 ppm), but elevated concentrations are not endemic and could not be separated from contributions of natural geological seeps (>16 ppm) that form part of the background levels. While CRDS allows direct determination of CH4 sources, repeat measurements show the strong influence of atmospheric conditions on concentration and highlight the need for methods that quantify flux.

    Original languageEnglish
    Pages (from-to)683-690
    Number of pages8
    JournalAustralian Journal of Earth Sciences
    Volume65
    Issue number5
    DOIs
    Publication statusPublished - 2018

    Keywords

    • methane concentration
    • coal seam gas
    • spatial variability
    • temporal variability
    • fugitive emissions

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