• Atmosphere-driven ice sheet mass loss paced by topography: Insights from modelling the south-western Scandinavian Ice Sheet 

      Åkesson, Henning; Morlighem, Mathieu; Nisancioglu, Kerim Hestnes; Svendsen, John-Inge; Mangerud, Jan (Peer reviewed; Journal article, 2018-09)
      Marine-terminating glaciers and ice streams are important controls of ice sheet mass balance. However, understanding of their long-term response to external forcing is limited by relatively short observational records of ...
    • Can we use ice sheet reconstructions to constrain meltwater for deglacial simulations? 

      Bethke, Ingo; Li, Camille; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2012)
      Freshwater pulses from melting ice sheets are thought to be important for driving deglacial climate variability. This study investigates challenges in simulating and understanding deglacial climate evolution within this ...
    • Changes in atmospheric variability in a glacial climate and the impacts on proxy data: a model intercomparison 

      Pausata, Francesco S. R.; Li, Camille; Wettstein, Justin; Nisancioglu, Kerim Hestnes; Battisti, David Stephen (Peer reviewed; Journal article, 2009-09-11)
      Using four different climate models, we investigate sea level pressure variability in the extratropical North Atlantic in the preindustrial climate (1750 AD) and at the Last Glacial Maximum (LGM, 21 kyrs before present) ...
    • Consistent fluctuations in intermediate water temperature off the coast of Greenland and Norway during Dansgaard-Oeschger events 

      Sessford, Evangeline; Jensen, Mari Fjalstad; Tisserand, Amandine Aline; Muschitiello, Francesco; Dokken, Trond Martin; Nisancioglu, Kerim Hestnes; Jansen, Eystein (Peer reviewed; Journal article, 2019-11-01)
      Rapid warmings epitomize the Dansgaard-Oeschger events that are recorded in Greenland ice cores and imprinted in ocean sediment cores. While the abrupt climate changes appear connected to perturbations in sea ice and ocean ...
    • Dansgaard-Oeschger cycles: Interactions between ocean and sea ice intrinsic to the Nordic seas 

      Dokken, Trond Martin; Nisancioglu, Kerim Hestnes; Li, Camille; Battisti, David Stephen; Kissel, Catherine (Peer reviewed; Journal article, 2013-09)
      Dansgaard-Oeschger (D-O) cycles are the most dramatic, frequent, and wide-reaching abrupt climate changes in the geologic record. On Greenland, D-O cycles are characterized by an abrupt warming of 10 ± 5°C from a cold ...
    • 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 ...
    • Eemian Greenland SMB strongly sensitive to model choice 

      Plach, Andreas; Nisancioglu, Kerim Hestnes; Le clec'h, Sebastien; Born, Andreas; Langebroek, Petra; Guo, Chuncheng; Imhof, Michael; Stocker, Thomas F. (Peer reviewed; Journal article, 2018-10-19)
      Understanding the behavior of the Greenland ice sheet in a warmer climate, and particularly its surface mass balance (SMB), is important for assessing Greenland’s potential contribution to future sea level rise. The Eemian ...
    • Equilibrium simulations of Marine Isotope Stage 3 climate 

      Guo, Chuncheng; Nisancioglu, Kerim Hestnes; Bentsen, Mats; Bethke, Ingo; Zhang, Zhongshi (Peer reviewed; Journal article, 2019-06-26)
      An equilibrium simulation of Marine Isotope Stage 3 (MIS3) climate with boundary conditions characteristic of Greenland Interstadial 8 (GI-8; 38 kyr BP) is carried out with the Norwegian Earth System Model (NorESM). A ...
    • Impact of Fjord Geometry on Grounding Line Stability 

      Åkesson, Henning; Nisancioglu, Kerim Hestnes; Nick, Faezeh M. (Peer reviewed; Journal article, 2018-06-05)
      Recent and past retreat of marine-terminating glaciers are broadly consistent with observed ocean warming, yet responses vary significantly within regions experiencing similar ocean conditions. We assess how fjord geometry ...
    • Increased ventilation of Antarctic deep water during the warm mid-Pliocene 

      Zhang, Zhongshi; Nisancioglu, Kerim Hestnes; Ninnemann, Ulysses Silas (Peer reviewed; Journal article, 2013-02-19)
      The mid-Pliocene warm period is a recent warm geological period that shares similarities with predictions of future climate. It is generally held the mid-Pliocene Atlantic Meridional Overturning Circulation must have been ...
    • The interaction between sea ice and salinity-dominated ocean circulation: implications for halocline stability and rapid changes of sea ice cover 

      Jensen, Mari Fjalstad; Nilsson, Johan; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2016-11)
      Changes in the sea ice cover of the Nordic Seas have been proposed to play a key role for the dramatic temperature excursions associated with the Dansgaard–Oeschger events during the last glacial. In this study, we develop ...
    • The key role of topography in altering North Atlantic atmospheric circulation during the last glacial period 

      Pausata, Francesco S. R.; Li, Camille; Wettstein, Justin; Kageyama, M.; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2011-10-18)
      The Last Glacial Maximum (LGM; 21 000 yr before present) was a period of low atmospheric greenhouse gas concentrations, when vast ice sheets covered large parts of North America and Europe. Paleoclimate reconstructions and ...
    • Large changes in sea ice triggered by small changes in Atlantic water temperature 

      Jensen, Mari Fjalstad; Nisancioglu, Kerim Hestnes; Spall, Michael A. (Peer reviewed; Journal article, 2018-06)
      The sensitivity of sea ice to the temperature of inflowing Atlantic water across the Greenland–Scotland Ridge is investigated using an eddy-resolving configuration of the Massachusetts Institute of Technology General ...
    • Lessons from a high-CO2 world: an ocean view from  ∼ 3 million years ago 

      McClymont, Erin L.; Ford, Heather; Ho, Sze Ling; Tindall, Julia C.; Haywood, Alan M.; Alonso-Garcia, Montserrat; Bailey, Ian; Berke, Melissa A.; Littler, Kate; Patterson, Molly O.; Petrick, Benjamin; Peterse, Francien; Ravelo, Ana Christina; Risebrobakken, Bjørg; De Schepper, Stijn; Swann, George E. A.; Kaustubh, Thirumalai; Tierney, Jessica E; Van der Weijst, Carolien; white, sarah; Abe-Ouchi, Ayako; Baatsen, Michiel L. J.; Brady, Esther C.; Chan, Wing-Le; Chandan, Deepak; Ran, Feng; Guo, Chenchen Guo; von der Heydt, Anna S.; Stephen, Hunter; Xiangyi, Li; Lohmann, Gerrit; Nisancioglu, Kerim Hestnes; Otto-Bliesner, Bette L.; Peltier, Richard W.; Stepanek, Christian; Zhang, Zhongshi (Journal article; Peer reviewed, 2020)
      A range of future climate scenarios are projected for high atmospheric CO2 concentrations, given uncertainties over future human actions as well as potential environmental and climatic feedbacks. The geological record ...
    • Melting of Northern Greenland during the last interglaciation 

      Born, Andreas; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2012-11-05)
      Using simulated climate data from the comprehensive coupled climate model IPSL CM4, we simulate the Greenland ice sheet (GrIS) during the Eemian interglaciation with the three-dimensional ice sheet model SICOPOLIS. The ...
    • The PMIP4 contribution to CMIP6 – Part 4: Scientific objectives and experimental design of the PMIP4-CMIP6 Last Glacial Maximum experiments and PMIP4 sensitivity experiments 

      Kageyama, Masa; Albani, Samuel; Braconnot, Pascale; Harrison, Sandy P.; Hopcroft, Peter O.; Ivanovic, Ruza F.; Lambert, F; Marti, Olivier; Peltier, W. Richard; Peterschmidt, Jean-Yves; Roche, Didier M.; Tarasov, Lev; Zhang, Xu; Brady, Esther C.; Haywood, Alan M.; LeGrande, A.; Lunt, Daniel J; Mahowald, Natalie M.; Mikolajewicz, Uwe; Nisancioglu, Kerim Hestnes; Otto-Bliesner, Bette L.; Renssen, Hans; Thomas, Robert A.; Zhang, Qiong; Abe-Ouchi, Ayako; Bartlein, Patrick J; Cao, Jian; Li, Qiang; Lohmann, Gerrit; Ohgaito, Rumi; Shi, Xiaoxu; Volodin, Evgeny; Yoshida, Kohei; Zhang, Xiao; Zheng, Weipeng (Peer reviewed; Journal article, 2017)
      The Last Glacial Maximum (LGM, 21 000 years ago) is one of the suite of paleoclimate simulations included in the current phase of the Coupled Model Intercomparison Project (CMIP6). It is an interval when insolation was ...
    • The role of subglacial hydrology in ice streams with elevated geothermal heat flux 

      Smith-Johnsen, Silje; de Fleurian, Basile; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2020-02-10)
      The spatial distribution of geothermal heat flux (GHF) under ice sheets is largely unknown. Nonetheless, it is an important boundary condition in ice-sheet models, and suggested to control part of the complex surface ...
    • Sensitivity of the Northeast Greenland Ice Stream to Geothermal Heat 

      Smith-Johnsen, Silje; Schlegel, Nicole; de Fleurian, Basile; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2019-12-20)
      Recent observations of ice flow surface velocities have helped improve our understanding of basal processes on Greenland and Antarctica, though these processes still constitute some of the largest uncertainties driving ice ...
    • Simulated retreat of Jakobshavn Isbræ since the Little Ice Age controlled by geometry 

      Steiger, Nadine; Nisancioglu, Kerim Hestnes; Åkesson, Henning; de Fleurian, Basile; Nick, Faezeh M. (Peer reviewed; Journal article, 2018-07-12)
      Rapid retreat of Greenland's marine-terminating glaciers coincides with regional warming trends, which have broadly been used to explain these rapid changes. However, outlet glaciers within similar climate regimes experience ...
    • Simulated retreat of Jakobshavn Isbræ since the Little Ice Age controlled by geometry 

      Steiger, Nadine; Nisancioglu, Kerim Hestnes; Åkesson, Henning; de Fleurian, Basile; Nick, Faezeh M. (Peer reviewed; Journal article, 2018-07-12)
      Rapid retreat of Greenland's marine-terminating glaciers coincides with regional warming trends, which have broadly been used to explain these rapid changes. However, outlet glaciers within similar climate regimes ...