Browsing HVL Open by Author "Hodson, Andrew"

Now showing items 1-20 of 20

    • Aerodynamic roughness length of crevassed tidewater glaciers from UAV mapping 

      Dachauer, Armin; Hann, Richard; Hodson, Andrew (Peer reviewed; Journal article, 2021)
      The aerodynamic roughness length (z_0) is an important parameter in the bulk approach for calculating turbulent fluxes and their contribution to ice melt. However, z_0 estimates for heavily crevassed tidewater glaciers are ...

    • Biogeochemical processes in the active layer and permafrost of a High Arctic fjord valley 

      Jones, Eleanor; Hodson, Andrew; Thornton, Steven F.; Redeker, Kelly Robert; Rogers, Jade; Wynn, Peter M.; Dixon, Timothy J.; Bottrell, Simon H.; O’Neill, H. Brendan (Journal article; Peer reviewed, 2020)
      Warming of ground is causing microbial decomposition of previously frozen sedimentary organic carbon in Arctic permafrost. However, the heterogeneity of the permafrost landscape and its hydrological processes result in ...

    • Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard 

      Jones, Eleanor L.; Hodson, Andrew; Redeker, Kelly Robert; Christiansen, Hanne H.; Thornton, Steve F.; Rogers, Jade (Peer reviewed; Journal article, 2023)
      Arctic wetlands are a globally significant store of soil organic carbon. They are often characterized by ice-wedge polygons, which are diagnostic of lowland permafrost, and which greatly influence wetland hydrology and ...

    • Drainage system and thermal structure of a High Arctic polythermal glacier: Waldemarbreen, western Svalbard 

      Karušs, Janis; Lamsters, Kristaps; Sobota, Ireneusz; Ješkins, Jurijs; Džerinš, Peteris; Hodson, Andrew (Peer reviewed; Journal article, 2021)
      Understanding glacier drainage system behaviour and its response to increased meltwater production faces several challenges in the High Arctic because many glaciers are transitioning from polythermal to almost entirely ...

    • Effects of glacier retreat upon glacier-groundwater coupling and biogeochemistry in Central Svalbard 

      Hodson, Andrew; Kleber, Gabrielle Emma; Johnson, Jack; Lonardi, Michael; Petroselli, Chiara; Dixon, Tim; Bottrell, Simon (Peer reviewed; Journal article, 2023)
      The hydrology and biogeochemistry of perennial groundwater springs emerging in the forefields of retreating Svalbard glaciers are considered through a single-site, multi-year study at Foxfonna, and a multi-site spatial ...

    • Functional associations and resilience in microbial communities 

      Ávila-Jimenéz, Maria Luisa; Burns, Gavin; He, Zhili; Zhou, Jizhong; Hodson, Andrew; Avila-Jimenez, Jose-Luis; Pearce, David A. (Peer reviewed; Journal article, 2020)
      Microbial communities have inherently high levels of metabolic flexibility and functional redundancy, yet the structure of microbial communities can change rapidly with environmental perturbation. To understand whether ...

    • Geochemical signatures of pingo ice and its origin in Grøndalen, West Spitsbergen 

      Demidov, Nikita; Wetterich, Sebastian; Verkulich, Sergey; Ekaykin, Alexey; Meyer, Hanno; Anisimov, Mikhail; Schirrmeister, Lutz; Demidov, Vasily; Hodson, Andrew (Peer reviewed; Journal article, 2019)
      Pingos are common features in permafrost regions that form by subsurface massive-ice aggradation and create hill-like landforms. Pingos on Spitsbergen have been previously studied to explore their structure, formation ...

    • Icescape-scale metabolomics reveals cyanobacterial and topographic control of the core metabolism of the cryoconite ecosystem of an Arctic ice cap 

      Gokul, Jarishma K.; Mur, Luis A. J.; Hodson, Andrew; Irvine-Fynn, Tristram D. L.; Debbonaire, Aliyah R.; Takeuchi, Nozomu; Edwards, Arwyn (Peer reviewed; Journal article, 2023)
      Glaciers host ecosystems comprised of biodiverse and active microbiota. Among glacial ecosystems, less is known about the ecology of ice caps since most studies focus on valley glaciers or ice sheet margins. Previously we ...

    • Levels and distribution profiles of Per- and Polyfluoroalkyl Substances (PFAS) in a high Arctic Svalbard ice core 

      Hartz, William F; Björnsdotter, Maria; Yeung, Leo WY.; Hodson, Andrew; Thomas, Elizabeth R; Humby, Jack D.; Day, Chris; Jogsten, Ingrid Ericson; Kallenborn, Roland (Peer reviewed; Journal article, 2023)
      Per- and polyfluoroalkyl substances (PFAS) are a group of persistent organic contaminants of which some are toxic and bioaccumulative. Several PFAS can be formed from the atmospheric degradation of precursors such as ...

    • Microbial iron reduction and greenhouse gas production in response to organic matter amendment and temperature increase of periglacial sediments, Bolterdalen, Svalbard 

      Kolchev, Ivaylo; Marshall, Ian P.G.; Jones, Eleanor; Yde, Jacob C.; Nørnberg, Per; Mateos-Rivera, Alejandro; Hodson, Andrew; Bak, Ebbe N.; Finster, Kai (Peer reviewed; Journal article, 2022)
      Arctic permafrost soils store substantial reserves of organic matter (OM) from which microbial transformation contributes significantly to greenhouse gas emissions of CH4 and CO2. However, many younger sediments exposed ...

    • Modelling of the gas hydrate potential in Svalbard's fjords 

      Betlem, Peter; Roy, Srikumar; Birchall, Thomas; Hodson, Andrew; Noormets, Riko; Römer, Miriam; Skogseth, Ragnheid; Senger, Kim (Peer reviewed; Journal article, 2021)
      Large amounts of methane are trapped as natural gas hydrate (NGH) in the sediments of the Arctic. Unlike NGH provinces offshore west of Svalbard (Vestnesa Ridge), NGH potential in Svalbard’s fjords and near-shore environment ...

    • Numerical modelling of permafrost spring discharge and open-system pingo formation induced by basal permafrost aggradation 

      Hornum, Mikkel Toft; Hodson, Andrew; Jessen, Søren; Bense, Victor; Senger, Kim (Journal article; Peer reviewed, 2020)
      In the high Arctic valley of Adventdalen, Svalbard, sub-permafrost groundwater feeds several pingo springs distributed along the valley axis. The driving mechanism for groundwater discharge and associated pingo formation ...

    • Permafrost trapped natural gas in Svalbard, Norway 

      Birchall, Thomas; Jochmann, Malte Michel; Betlem, Peter; Senger, Kim; Hodson, Andrew; Olaussen, Snorre (Peer reviewed; Journal article, 2023)
      Permafrost is widespread in the High Arctic, including the Norwegian archipelago of Svalbard. The uppermost permafrost intervals have been well studied, but the processes at its base and the impacts of the underlying geology ...

    • Pressure and inertia sensing drifters for glacial hydrology flow path measurements 

      Alexander, Andreas; Kruusmaa, Maarja; Tuhtan, Jeffrey; Hodson, Andrew; Schuler, Thomas; Kääb, Andreas (Peer reviewed; Journal article, 2020)
      Glacial hydrology plays an important role in the control of glacier dynamics, of sediment transport, and of fjord and proglacial ecosystems. Surface meltwater drains through glaciers via supraglacial, englacial and subglacial ...

    • Reconciling Svalbard Glacier Mass Balance 

      Schuler, Thomas Vikhamar; Kohler, Jack; Elagina, Nelly; Hagen, Jon Ove Methlie; Hodson, Andrew; Jania, Jacek A.; Kääb, Andreas Max; Luks, Bartłomiej; Małecki, Jakub; Moholdt, Geir; Pohjola, Veijo A.; Sobota, Ireneusz; Van Pelt, Ward J. J. (Peer reviewed; Journal article, 2020)
      Since the first estimates of Svalbard-wide glacier mass balance were made in the early 2000s, there has been great progress in remote sensing and modeling of mass balance, existing field records have been extended, field ...

    • Seasonal Snowpack Microbial Ecology and Biogeochemistry on a High Arctic Ice Cap Reveals Negligible Autotrophic Activity During Spring and Summer Melt 

      Dayal, Archana; Hodson, Andrew; Šabacká, M.; Smalley, A.L. (Peer reviewed; Journal article, 2023)
      Snowpack ecosystem studies are primarily derived from research on snow-on-soil ecosystems. Greater research attention needs to be directed to the study of glacial snow covers as most snow cover lies on glaciers and ice ...

    • 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 (Peer reviewed; Journal article, 2021)
      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 ...

    • Spatially consistent microbial biomass and future cellular carbon release from melting Northern Hemisphere glacier surfaces 

      Stevens, Ian T.; Irvine-Fynn, Tristram D. L.; Edwards, Arwyn; Mitchell, Andrew C.; Cook, Joseph M.; Porter, Philip R.; Holt, Tom O.; Huss, Matthias; Fettweis, Xavier; Moorman, Brian J.; Sattler, Birgit; Hodson, Andrew (Peer reviewed; Journal article, 2022)
      Melting glacier ice surfaces host active microbial communities that enhance glacial melt, contribute to biogeochemical cycling, and nourish downstream ecosystems; but these communities remain poorly characterised. Over the ...

    • Sub-permafrost methane seepage from open-system pingos in Svalbard 

      Hodson, Andrew; Nowak, Aga; Hornum, Mikkel Toft; Senger, Kim; Redeker, Kelly Robert; Christiansen, Hanne H; Jessen, Søren; Betlem, Peter; Thornton, Steve F.; Turchyn, Alexandra V.; Olaussen, Snorre; Marca, Alina (Journal article; Peer reviewed, 2020)
      Methane release from beneath lowland permafrost represents an important uncertainty in the Arctic greenhouse gas budget. Our current knowledge is arguably best developed in settings where permafrost is being inundated by ...

    • Time-lapse photogrammetry reveals hydrological controls of fine-scale High-Arctic glacier surface roughness evolution 

      Irvine-Fynn, Tristram D. L.; Holt, Tom O.; James, Timothy D.; Smith, Mark W.; Rutter, Nick; Porter, Philip R.; Hodson, Andrew (Peer reviewed; Journal article, 2022)
      In a warming Arctic, as glacier snowlines rise, short- to medium-term increases in seasonal bare-ice extent are forecast for the next few decades. These changes will enhance the importance of turbulent energy fluxes for ...