Blar i forfatter "Hattermann, Tore"

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    • Biogeographic gradients of picoplankton diversity indicate increasing dominance of prokaryotes in warmer Arctic fjords 

      Hörstmann, Cora; Hattermann, Tore; Thomé, Pauline C.; Buttigieg, Pier Luigi; Morel, Isidora; Waite, Anya M.; John, Uwe (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-02)
      limate change is opening the Arctic Ocean to increasing human impact and ecosystem changes. Arctic fjords, the region’s most productive ecosystems, are sustained by a diverse microbial community at the base of the food web. Here we show that Arctic fjords become more prokaryotic in the picoplankton (0.2–3 µm) with increasing water temperatures. Across 21 fjords, we found that Arctic fjords had ...

    • CMIP5 model selection for ISMIP6 ice sheet model forcing: Greenland and Antarctica 

      Barthel, Alice; Agosta, Cécile; Little, Christopher M.; Hattermann, Tore; Jourdain, Nicolas; Goelzer, Heiko; Nowicki, Sophie; Seroussi, Helene; Straneo, Fiammetta; Bracegirdle, Thomas J. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-03-06)
      The ice sheet model intercomparison project for CMIP6 (ISMIP6) effort brings together the ice sheet and climate modeling communities to gain understanding of the ice sheet contribution to sea level rise. ISMIP6 conducts stand-alone ice sheet experiments that use space- and time-varying forcing derived from atmosphere–ocean coupled global climate models (AOGCMs) to reflect plausible trajectories for ...

    • Evaluation of an emergent feature of sub-shelf melt oscillations from an idealized coupled ice sheet-ocean model using FISOC (v1.1) - ROMSIceShelf (v1.0) - Elmer/Ice (v9.0) 

      Zhao, Chen; Gladstone, Rupert; Galton-Fenzi, Benjamin Keith; Gwyther, David; Hattermann, Tore (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-15)
      Changes in ocean-driven basal melting have a key influence on the stability of ice shelves, the mass loss from the ice sheet, ocean circulation, and global sea level rise. Coupled ice sheet–ocean models play a critical role in understanding future ice sheet evolution and examining the processes governing ice sheet responses to basal melting. However, as a new approach, coupled ice sheet–ocean systems ...

    • Experimental protocol for sea level projections from ISMIP6 stand-alone ice sheet models 

      Nowicki, Sophie; Goelzer, Heiko; Seroussi, Hélène; Payne, Anthony J.; Lipscomb, William H.; Abe-Ouchi, Ayako; Agosta, Cécile; Alexander, Patrick; Asay-Davis, Xylar S; Barthel, Alice; Bracegirdle, Thomas J.; Cullather, Richard; Felikson, Denis; Fettweis, Xavier; Gregory, Jonathan M.; Hattermann, Tore; Jourdain, Nicolas C.; Munneke, Peter Kuipers; Larour, Eric; Little, Christopher M.; Morlighem, Mathieu; Nias, Isabel; Shepherd, Andrew; Simon, Erika; Slater, Donald; Smith, Robin; Straneo, Fiammetta; Trusel, Luke D.; van den Broeke, Michiel R.; Van de Wal, Roderik (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-23)
      Projection of the contribution of ice sheets to sea level change as part of the Coupled Model Intercomparison Project Phase 6 (CMIP6) takes the form of simulations from coupled ice sheet–climate models and stand-alone ice sheet models, overseen by the Ice Sheet Model Intercomparison Project for CMIP6 (ISMIP6). This paper describes the experimental setup for process-based sea level change projections ...

    • The Framework for Ice Sheet-Ocean Coupling (FISOC) V1.1 

      Gladstone, Rupert; Galton-Fenzi, Benjamin K.; Gwyther, David; Zhou, Qin; Hattermann, Tore; Zhao, Chen; Jong, Lenneke; Xia, Yuwei; Guo, Xiaoran; Petrakopoulos, Konstantinos; Zwinger, Thomas; Shapero, Daniel; Moore, John C. (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-11)
      A number of important questions concern processes at the margins of ice sheets where multiple components of the Earth system, most crucially ice sheets and oceans, interact. Such processes include thermodynamic interaction at the ice–ocean interface, the impact of meltwater on ice shelf cavity circulation, the impact of basal melting of ice shelves on grounded ice dynamics and ocean controls on ...

    • Ice Shelf - Ocean Interaction in the Eastern Weddell Sea, Antarctica 

      Hattermann, Tore (Doctoral thesis; Doktorgradsavhandling, 2012-12-10)
      This thesis investigates the interaction of the Antarctic ice shelves along the coast of Dronning Maud Land with the ocean circulation in the Eastern Weddell Sea. A set of direct oceanic observations below the Fimbul Ice Shelf, which were acquired during three Antarctic field seasons in the austral summers 2009/10, 2010/11 and 2011/12, is a central element of the presented work. This new oceanographic ...

    • Impact of the Nares Strait sea ice arches on the long-term stability of the Petermann Glacier ice shelf 

      Prakash, Abhay; Zhou, Qin; Hattermann, Tore; Kirchner, Nina (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-12)
      One of the last remaining floating tongues of the Greenland ice sheet (GrIS), the Petermann Glacier ice shelf (PGIS), is seasonally shielded from warm Atlantic water (AW) by the formation of sea ice arches in the Nares Strait. However, continued decline of the Arctic sea ice extent and thickness suggests that arch formation is likely to become anomalous, necessitating an investigation into ...

    • Necessary Conditions for Warm Inflow Toward the Filchner Ice Shelf, Weddell Sea 

      Daae, Kjersti; Hattermann, Tore; Darelius, Elin Maria K.; Mueller, Rachael D.; Naughten, Kaitlin A; Timmermann, Ralph; Hellmer, Hartmut H. (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-09)
      Understanding changes in Antarctic ice shelf basal melting is a major challenge for predicting future sea level. Currently, warm Circumpolar Deep Water surrounding Antarctica has limited access to the Weddell Sea continental shelf; consequently, melt rates at Filchner‐Ronne Ice Shelf are low. However, large‐scale model projections suggest that changes to the Antarctic Slope Front and the coastal ...

    • A nested high-resolution unstructured grid 3-D ocean-sea ice-ice shelf setup for numerical investigations of the Petermann ice shelf and fjord 

      Prakash, Abhay; Zhou, Qin; Hattermann, Tore; Bao, Weiyang; Graversen, Rune Grand; Kirchner, Nina (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-18)
      Three-dimensional numerical simulation of circulation in fjords hosting marine-terminating ice shelves is challenging because of the complexity of processes involved in such environments. This often requires a comprehensive model setup. The following elements are needed: bathymetry (usually unknown beneath the glacier tongue), ice shelf draft (impacting water column thickness), oceanographic state ...

    • Productive detours – Atlantic water inflow and acoustic backscatter in the major troughs along the Svalbard shelf 

      Menze, Sebastian; Ingvaldsen, Randi Brunvær; Nikolopoulos, Anna; Hattermann, Tore; Albretsen, Jon; Gjøsæter, Harald (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-30)
      Atlantic Water (AW) flowing along the western and northern Svalbard shelf-break extends the Atlantic domain into the Arctic and is the region’s major source of heat, nutrients and advected plankton. We investigated the inflow and recirculation of AW into four major troughs that cut into the Svalbard shelf, the Isfjorden, Kongsfjorden, Hinlopen and Kvitøya Troughs, and related the circulation patterns ...

    • Properties and dynamics of mesoscale eddies in Fram Strait from a comparison between two high-resolution ocean-sea ice models 

      Wekerle, Claudia; Hattermann, Tore; Wang, Qiang; Crews, Laura; von Appen, Wilken-Jon; Danilov, Sergey (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-23)
      Fram Strait, the deepest gateway to the Arctic Ocean, is strongly influenced by eddy dynamics. Here we analyse the output from two eddy-resolving models (ROMS – Regional Ocean Modeling System; FESOM – Finite-Element Sea-ice Ocean Model) with around 1 km mesh resolution in Fram Strait, with a focus on their representation of eddy properties and dynamics. A comparison with mooring observations shows ...

    • A review of the scientific knowledge of the seascape off Dronning Maud Land, Antarctica 

      Lowther, Andrew; von Quillfeldt, Cecilie; Assmy, Philipp; de Steur, Laura; Descamps, Sebastien; Divine, Dmitry V; Elvevold, Synnøve; Forwick, Matthias; Fransson, Agneta; Fraser, Alexander; Gerland, Sebastian; Granskog, Mats A.; Hallanger, Ingeborg G.; Hattermann, Tore; Itkin, Mikhail; Hop, Haakon; Husum, Katrine; Kovacs, Kit M.; Lydersen, Christian; Matsuoka, Kenichi; Miettinen, Arto; Moholdt, Geir; Moreau, Sebastien; Myhre, Per Inge; Orme, Lisa; Pavlova, Olga; Tandberg, Anne Helene S. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-29)
      Despite the exclusion of the Southern Ocean from assessments of progress towards achieving the Convention on Biological Diversity (CBD) Strategic Plan, the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR) has taken on the mantle of progressing eforts to achieve it. Within the CBD, Aichi Target 11 represents an agreed commitment to protect 10% of the global coastal and ...

    • Trans-polar drift-pathways of riverine European microplastic 

      Huserbråten, Mats Brockstedt Olsen; Hattermann, Tore; Broms, Cecilie; Albretsen, Jon (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-17)
      High concentrations of microplastic particles are reported across the Arctic Ocean–yet no meaningful point sources, suspension timelines, or accumulation areas have been identified. Here we use Lagrangian particle advection simulations to model the transport of buoyant microplastic from northern European rivers to the high Arctic, and compare model results to the flux of sampled synthetic particles ...