• Atlantic Multidecadal Oscillation modulates the impacts of Arctic sea ice decline 

      Li, Fei; Orsolini, Yvan; Wang, Huijun; Gao, Yongqi; He, Shengping (Peer reviewed; Journal article, 2018-03)
      The Arctic sea ice cover has been rapidly declining in the last two decades, concurrent with a shift in the Atlantic Multidecadal Oscillation (AMO) to its warm phase around 1996/1997. Here we use both observations and model ...
    • Cancellation of the precessional cycle in δ18O records during the Early Pleistocene 

      Morée, Anne; Sun, Tianyi; Bretones, Anaïs; Straume, Eivind Olavson; Nisancioglu, Kerim Hestnes; Gebbie, Geoffrey (Journal article; Peer reviewed, 2021)
      The dominant pacing of glacial‐interglacial cycles in deep‐ocean δ18O records changed substantially during the Mid‐Pleistocene Transition. The precessional cycle (∼23 ky) is absent during the Early Pleistocene, which we ...
    • Connecting ocean heat transport changes from the mid-latitudes to the Arctic Ocean 

      Nummelin, Aleksi; Li, Camille; Hezel, Paul (Peer reviewed; Journal article, 2017-02)
      Under greenhouse warming, climate models simulate a weakening of the Atlantic Meridional Overturning Circulation and the associated ocean heat transport at midlatitudes but an increase in the ocean heat transport to the ...
    • Control of Barents Sea wintertime cyclone variability by large-scale atmospheric flow 

      Madonna, Erica; Hes, Gabriel; Li, Camille; Michel, Clio; Siew, Yu Feng (Journal article; Peer reviewed, 2020)
      Extratropical cyclones transport heat and moisture into the Arctic, which can promote surface warming and sea ice melt. We investigate wintertime cyclone variability in the Barents Sea region to understand what controls ...
    • Diabatic Heating as a Pathway for Cyclone Clustering Encompassing the Extreme Storm Dagmar 

      Weijenborg, Christian; Spengler, Thomas (Journal article, 2020)
      Contrary to the general notion that extratropical cyclones reduce baroclinicity, the baroclinicity is found to be enhanced in the wake of the extreme winter storm Dagmar. Thus, individual storms can increase baroclinicity, ...
    • Eurasian Cooling Linked to the Vertical Distribution of Arctic Warming 

      He, Shengping; Xu, Xinping; Furevik, Tore; Gao, Yongqi (Journal article; Peer reviewed, 2020)
      Observations show that deep Arctic winter warming, extending from surface to mid‐troposphere, has concurred with below‐average temperature over central Eurasia. Modeling studies focusing on the response to Arctic sea ice ...
    • Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017 

      Ryan, Svenja; Hellmer, Hartmut H.; Janout, Markus; Darelius, Elin Maria K.; Schröder, Michael; Vignes, Lucie (Journal article; Peer reviewed, 2020)
      The Filchner-Ronne Ice Shelf, fringing the southern Weddell Sea, is Antarctica's second largest ice shelf. At present, basal melt rates are low due to active dense water formation; however, model projections suggest a ...
    • Intensification of Near‐Surface Currents and Shear in the Eastern Arctic Ocean 

      Polyakov, Igor V.; Rippeth, Tom; Fer, Ilker; Baumann, Till Martin; Carmack, Eddy C.; Ivanov, Vladimir V.; Janout, Markus; Padman, Laurie; Pnyushkov, A.V.; Rember, Robert (Journal article; Peer reviewed, 2020)
      A 15‐year (2004–2018) record of mooring observations from the upper 50 m of the ocean in the eastern Eurasian Basin reveals increased current speeds and vertical shear, associated with an increasing coupling between wind, ...
    • Intermittent Reduction in Ocean Heat Transport Into the Getz Ice Shelf Cavity During Strong Wind Events 

      Steiger, Nadine; Darelius, Elin; Wåhlin, Anna; Assmann, Karen Margarete (Journal article; Peer reviewed, 2021)
      The flow of warm water toward the western Getz Ice Shelf along the Siple Trough, West Antarctica, is intermittently disrupted during short events of Winter Water deepening. Here we show, using mooring records, that these ...
    • Laboratory Experiments on Internal Solitary Waves in Ice-Covered Waters 

      Carr, Magda; Sutherland, P.; Haase, A.; Evers, K.-U.; Fer, Ilker; Jensen, Atle; Kalisch, Henrik; Berntsen, Jarle; Parau, E.; Thiem, Ø.; Davies, P.A. (Peer reviewed; Journal article, 2019)
      Internal solitary waves (ISWs) propagating in a stably stratified two‐layer fluid in which the upper boundary condition changes from open water to ice are studied for grease, level, and nilas ice. The ISW‐induced current ...
    • Marine-based multiproxy reconstruction of Atlantic multidecadal variability 

      Svendsen, Lea; Hetzinger, Steffen; Keenlyside, Noel; Gao, Yongqi (Peer reviewed; Journal article, 2014-02-28)
      Atlantic multidecadal variability (AMV) is known to impact climate globally, and knowledge about the persistence of AMV is important for understanding past and future climate variability, as well as modeling and assessing ...
    • Mean structure and seasonality of the Norwegian Atlantic Front Current along the Mohn Ridge from repeated glider transects 

      Bosse, Anthony; Fer, Ilker (Peer reviewed; Journal article, 2019)
      The poleward flow of Atlantic Water in the Nordic Seas forms the upper limb of the meridional overturning circulation driving an important heat transport. The Norwegian Atlantic Front Current along the Mohn Ridge between ...
    • Mechanisms underlying recent Arctic atlantification 

      Asbjørnsen, Helene; Årthun, Marius; Skagseth, Øystein; Eldevik, Tor (Journal article; Peer reviewed, 2020-06-20)
      Recent warming and reduced sea ice concentrations in the Atlantic sector of the Arctic Ocean are the main signatures of ongoing Arctic “Atlantification.” The mechanisms driving the warming trends are nevertheless still ...
    • 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; Peer reviewed, 2020)
      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 ...
    • On effect of wave breaking on short wind waves 

      Kudryavtsev, Vladimir; Johannessen, Johnny A. (Peer reviewed; Journal article, 2004-10)
      The paper presents an attempt to estimate short wave generation by wave breaking. A breaking wave crest disturbs the surface and generates sub-surface turbulence. The locally disturbed area further disperses and feeds short ...
    • Recent and future changes of the Arctic sea-ice cover 

      Smedsrud, Lars Henrik; Sorteberg, Asgeir; Kloster, Kjell (Peer reviewed; Journal article, 2008)
      The present and future state of the Arctic sea ice cover is explored using new observations and a coupled one dimensional air–sea–ice model. Updated satellite observations of Fram Strait ice-area export show an increase ...
    • Sea ice velocity in the Fram Strait monitored by moored instruments 

      Widell, K.; Østerhus, Svein; Gammelsrød, Tor (Peer reviewed; Journal article, 2003-10-04)
      The Fram Strait sea ice velocity was measured by means of a new method using moored Doppler Current Meters in the period 1996–2000. Almost 3 years of ice velocity observations near 79N 5W are analyzed. The average southward ...
    • Seasonal Outflow of Ice Shelf Water Across the Front of the Filchner Ice Shelf, Weddell Sea, Antarctica 

      Darelius, Elin Maria K.; Sallee, Jean-Bapiste (Peer reviewed; Journal article, 2018-04)
      The ice shelf water (ISW) found in the Filchner Trough, located in the southern Weddell Sea, Antarctica, is climatically important; it descends into the deep Weddell Sea contributing to bottom water formation, and it blocks ...
    • Supercooled Southern Ocean Waters 

      Haumann, F. Alexander; Moorman, Ruth; Riser, Stephen C.; Smedsrud, Lars H.; Maksym, Ted; Wong, Annie P. S.; Wilson, Earle A.; Drucker, Robert; Talley, Lynne D.; Johnson, Kenneth S.; Key, Robert M.; Sarmiento, Jorge L. (Journal article; Peer reviewed, 2020)
      In cold polar waters, temperatures sometimes drop below the freezing point, a process referred to as supercooling. However, observational challenges in polar regions limit our understanding of the spatial and temporal ...
    • Tidally Forced Lee Waves Drive Turbulent Mixing Along the Arctic Ocean Margins 

      Fer, Ilker; Koenig, Zoé Charlotte; Kozlov, Igor E.; Ostrowski, Marek; Rippeth, Tom; Padman, L.; Bosse, Anthony; Kolås, Eivind (Journal article; Peer reviewed, 2020)
      In the Arctic Ocean, limited measurements indicate that the strongest mixing below the atmospherically forced surface mixed layer occurs where tidal currents are strong. However, mechanisms of energy conversion from tides ...