Blar i Faculty of Mathematics and Natural Sciences på tidsskrift "The Cryosphere"

Viser treff 1-20 av 33

    • Arctic freshwater fluxes: sources, tracer budgets and inconsistencies 

      Forryan, Alexander; Bacon, Sheldon; Tsubouchi, Takamasa; Torres-Valdes, Sinhue; Garabato, Alberto C. Naveira (Peer reviewed; Journal article, 2019)
      The net rate of freshwater input to the Arctic Ocean has been calculated in the past by two methods: directly, as the sum of precipitation, evaporation and runoff, an approach hindered by sparsity of measurements, and by ...

    • The Arctic sea ice extent change connected to Pacific decadal variability 

      Yang, Xiao-Ying; Wang, Guihua; Keenlyside, Noel (Journal article; Peer reviewed, 2020)
      After an unprecedented retreat, the total Arctic sea ice cover for the post-2007 period is characterized by low extent and a remarkable increase in annual cycle amplitude. We have identified the leading role of spring ...

    • Combined influence of oceanic and atmospheric circulations on Greenland sea ice concentration 

      Chatterjee, Sourav; Raj, Roshin Pappukutty; Bertino, Laurent; Mernild, Jacob Sebastian Haugaard; Subeesh, Meethale P.; Murukesh, Nuncio; Ravichandran, Muthalagu (Journal article; Peer reviewed, 2021)
      The amount and spatial extent of Greenland Sea (GS) ice are primarily controlled by the sea ice export across the Fram Strait (FS) and by local seasonal sea ice formation, melting, and sea ice dynamics. In this study, using ...

    • Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland 

      Gilbert, Graham Lewis; Cable, Stefanie; Thiel, Christine; Christiansen, Hanne H; Elberling, Bo (Peer reviewed; Journal article, 2017-05-30)
      The Zackenberg River delta is located in northeast Greenland (74°30′ N, 20°30′ E) at the outlet of the Zackenberg fjord valley. The fjord-valley fill consists of a series of terraced deltaic deposits (ca. 2 km2) formed ...

    • Detection of ice core particles via deep neural networks 

      Maffezzoli, Niccolò; Cook, Eliza; van der Bilt, Willem Godert Maria; Støren, Eivind; Festi, Daniela; Muthreich, Florian; Seddon, Alistair William Robin; Burgay, François; Baccolo, Giovanni; Mygind, Amalie; Petersen, Troels; Spolaor, Andrea; Vascon, Alessio; Pelillo, Marcello; Ferretti, Patrizia; dos Reis, Rafael S.; Simões, Jefferson; Ronen, Yuval; Delmonte, Barbara; Viccaro, Marco; Steffensen, Jørgen Peder; Dahl-Jensen, Dorthe; Nisancioglu, Kerim Hestnes; Brabante, Carlo (Journal article; Peer reviewed, 2023)
      Insoluble particles in ice cores record signatures of past climate parameters like vegetation dynamics, volcanic activity, and aridity. For some of them, the analytical detection relies on intensive bench microscopy ...

    • Eemian Greenland ice sheet simulated with a higher-order model shows strong sensitivity to surface mass balance forcing 

      Plach, Andreas; Nisancioglu, Kerim Hestnes; Langebroek, Petra; Born, Andreas; Le clec'h, Sebastien (Peer reviewed; Journal article, 2019-08-15)
      The Greenland ice sheet contributes increasingly to global sea level rise. Its history during past warm intervals is a valuable reference for future sea level projections. We present ice sheet simulations for the Eemian ...

    • Estimating a mean transport velocity in the marginal ice zone using ice-ocean prediction systems 

      Sutherland, Graig; Martins de Aguiar, Victor Cesar; Hole, Lars Robert; Rabault, Jean; Dabboor, Mohammed; Breivik, Øyvind (Journal article; Peer reviewed, 2022)
      Understanding the transport of objects and material in the marginal ice zone (MIZ) is critical for human operations in polar regions. This can be the transport of pollutants, such as spilled oil, or the transport of objects, ...

    • Exceptionally high heat flux needed to sustain the Northeast Greenland Ice Stream 

      Smith-Johnsen, Silje; de Fleurian, Basile; Schlegel, Nicole; Seroussi, Hélène; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2020)
      The Northeast Greenland Ice Stream (NEGIS) currently drains more than 10 % of the Greenland Ice Sheet area and has recently undergone significant dynamic changes. It is therefore critical to accurately represent this feature ...

    • Forced and internal components of observed Arctic sea-ice changes 

      Dörr, Jakob Simon; Bonan, David; Årthun, Marius; Svendsen, Lea; Wills, Robert C.J. (Journal article; Peer reviewed, 2023)
      The Arctic sea-ice cover is strongly influenced by internal variability on decadal timescales, affecting both short-term trends and the timing of the first ice-free summer. Several mechanisms of variability have been ...

    • Geometric controls of tidewater glacier dynamics 

      Frank, Thomas; Åkesson, Henning; Fleurian, Basile de; Morlighem, M.; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2022)
      Retreat of marine outlet glaciers often initiates depletion of inland ice through dynamic adjustments of the upstream glacier. The local topography of a fjord may promote or inhibit such retreat, and therefore fjord geometry ...

    • GrSMBMIP: intercomparison of the modelled 1980-2012 surface mass balance over the Greenland Ice Sheet 

      Fettweis, Xavier; Hofer, Stefan; Krebs-Kanzow, Uta; Amory, Charles; Aoki, Teruo; Berends, Constantijn J.; Born, Andreas; Box, Jason E.; Delhasse, Alison; Fujita, Koji; Gierz, Paul; Goelzer, Heiko; Hanna, Edward; Hashimoto, Akihiro; Huybrechts, Philippe; Kapsch, Marie-Luise; King, Michaela D.; Kittel, Christoph; Lang, Charlotte; Langen, Peter L.; Lenaerts, Jan T.M.; Liston, Glen E.; Lohmann, Gerrit; Mernild, Jacob Sebastian Haugaard; Mikolajewicz, Uwe; Modali, Kameswarrao; Mottram, Ruth H.; Niwano, Masashi; Noël, Brice; Ryan, Jonathan C.; Smith, Amy; Streffing, Jan; Tedesco, Marco; Van de Berg, Willem Jan; Van den Broeke, Michiel; Van de Wal, Rodecrick S.; Von Kampenhout, Leo; Wilton, David; Wouters, Bert; Ziemen, Florian; Zolles, Tobias (Journal article; Peer reviewed, 2020)
      Observations and models agree that the Greenland Ice Sheet (GrIS) surface mass balance (SMB) has decreased since the end of the 1990s due to an increase in meltwater runoff and that this trend will accelerate in the future. ...

    • Impact of icebergs on the seasonal submarine melt of Sermeq Kujalleq 

      Kajanto, Karita; Straneo, Fiammetta; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2023)
      The role of icebergs in narrow fjords hosting marine-terminating glaciers in Greenland is poorly understood, even though iceberg melt results in a substantial freshwater flux that can exceed the subglacial discharge. ...

    • Impact of runoff temporal distribution on ice dynamics 

      Fleurian, Basile de; Davy, Richard; Langebroek, Petra (Journal article; Peer reviewed, 2022)
      Record highs of meltwater production at the surface of the Greenland ice sheet have been recorded with a high recurrence over the last decades. Those melt seasons with longer durations, larger intensities, or with both ...

    • Local-scale deposition of surface snow on the Greenland ice sheet 

      Zuhr, Alexandra M.; Münch, Thomas; Steen-Larsen, Hans Christian; Hörhold, Maria; Laepple, Thomas (Journal article; Peer reviewed, 2021)
      Ice cores from polar ice sheets and glaciers are an important climate archive. Snow layers, consecutively deposited and buried, contain climatic information from the time of their formation. However, particularly ...

    • Modeling the Greenland englacial stratigraphy 

      Born, Andreas; Robinson, Alexander (Journal article; Peer reviewed, 2021)
      Radar reflections from the interior of the Greenland ice sheet contain a comprehensive archive of past accumulation rates, ice dynamics, and basal melting. Combining these data with dynamic ice sheet models may greatly aid ...

    • Non-linear retreat of Jakobshavn Isbræ since the Little Ice Age controlled by geometry 

      Steiger, Nadine; Nisancioglu, Kerim H.; Åkesson, Henning; Fleurian, Basile de; Nick, Faezeh M. (Journal article, 2017-09)
      Rapid acceleration and retreat of Greenland's marine-terminating glaciers during the last two decades have initiated questions on the trigger and processes governing observed changes. Destabilization of these glaciers ...

    • Open-source feature-tracking algorithm for sea ice drift retrieval from Sentinel-1 SAR imagery 

      Muckenhuber, Stefan; Korosov, Anton Andreevich; Sandven, Stein (Peer reviewed; Journal article, 2016-04-26)
      A computationally efficient, open-source feature-tracking algorithm, called ORB, is adopted and tuned for sea ice drift retrieval from Sentinel-1 SAR (Synthetic Aperture Radar) images. The most suitable setting and parameter ...

    • Open-source sea ice drift algorithm for Sentinel-1 SAR imagery using a combination of feature tracking and pattern matching 

      Muckenhuber, Stefan; Sandven, Stein (Peer reviewed; Journal article, 2017-08-07)
      An open-source sea ice drift algorithm for Sentinel-1 SAR imagery is introduced based on the combination of feature tracking and pattern matching. Feature tracking produces an initial drift estimate and limits the search ...

    • Operational algorithm for ice–water classification on dual-polarized RADARSAT-2 images 

      Zakhvatkina, Natalia; Korosov, Anton; Muckenhuber, Stefan; Sandven, Stein; Babiker, Mohamed (Peer reviewed; Journal article, 2017-01-11)
      Synthetic Aperture Radar (SAR) data from RADARSAT-2 (RS2) in dual-polarization mode provide additional information for discriminating sea ice and open water compared to single-polarization data. We have developed an automatic ...

    • Passive seismic recording of cryoseisms in Adventdalen, Svalbard 

      Romeyn, Rowan; Hanssen, Alfred; Ruud, Bent Ole; Stemland, Helene Meling; Johansen, Tor Arne (Journal article; Peer reviewed, 2021)
      A series of transient seismic events were discovered in passive seismic recordings from 2-D geophone arrays deployed at a frost polygon site in Adventdalen, Svalbard. These events contain a high proportion of surface wave ...