Blar i forfatter "Hodson, Andrew"

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    • Groundwater springs formed during glacial retreat are a large source of methane in the high Arctic 

      Kleber, Gabreille E.; Hodson, Andrew; Magerl, Jasper Leonard; Mannerfelt, Erik Schytt; Bradbury, Harold J.; Zhu, Yizhu; Trimmer, Mark; Turchyn, Alexandra V. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-07-06)
      Permafrost and glaciers in the high Arctic form an impermeable ‘cryospheric cap’ that traps a large reservoir of subsurface methane, preventing it from reaching the atmosphere. Cryospheric vulnerability to climate warming is making releases of this methane possible. On Svalbard, where air temperatures are rising more than two times faster than the average for the Arctic, glaciers are retreating and ...

    • Seismic and electrical geophysical characterization of an incipient coastal open-system pingo: Lagoon Pingo, Svalbard 

      Hammock, Craig Paul; Kulessa, Bernd; Hiemstra, John F.; Hodson, Andrew; Hubbard, Alun (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-24)
      Whilst there has been a recent appreciation for the role of open-system pingos in providing a fluid-flow conduit through continuous permafrost that enables methane release, the formation and internal structure of these ubiquitous permafrost-diagnostic landforms remains unclear. Here, we combine active-source seismic measurements with electrical resistivity tomography (ERT) to investigate the structural ...

    • Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment 

      Kleber, Gabrielle Emma; Magerl, Leonard; Turchyn, Alexandra V.; Redeker, Kelly; Thiele, Stefan; Liira, Martin; Herodes, Koit; Øvreas, Lise; Hodson, Andrew (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-07)
      Glacial groundwater can mobilize deep-seated methane from beneath glaciers and permafrost in the Arctic, leading to atmospheric emissions of this greenhouse gas. We present a temporal, hydro-chemical dataset of methane-rich groundwater collected during two melt seasons from a high Arctic glacial forefield to explore the seasonal dynamics of methane emissions. We use methane and ion concentrations ...