Blar i Bergen Open Research Archive på forfatter "Nisancioglu, Kerim Hestnes"

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    • 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 ...

    • 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. ...

    • 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 ...

    • Internal Ocean Dynamics Control the Long-Term Evolution of Weddell Sea Polynya Activity 

      Rheinlænder, Jonathan Winfield; Smedsrud, Lars Henrik; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2021)
      Open-ocean polynyas effectively couple the ocean and atmosphere through large ice-free areas within the sea-ice cover, release vast quantities of oceanic heat, and impact deep ocean ventilation. Changes in polynya activity, ...

    • 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 ...

    • Mid-Pliocene Atlantic Meridional Overturning Circulation simulated in PlioMIP2 

      Zhang, Zhongshi; Li, Xiangyu; Guo, Chuncheng; Otterå, Odd Helge; Nisancioglu, Kerim Hestnes; Tan, Ning; Contoux, Camille; Ramstein, Gilles; Feng, Ran; Otto-Bliesner, Bette L.; Brady, Esther C.; Chandan, Deepak; Richard Peltier, Peltier; Baatsen, Michiel L. J.; Von Der Heydt, Anna S.; Weiffenbach, Julia E.; Stepanek, Christian; Lohmann, Gerrit; Zhang, Qiong; Li, Qiang; Chandler, Mark A.; Sohl, Linda E.; Haywood, Alan M.; Hunter, Stephen J.; Tindall, Julia C.; Williams, Charles; Lunt, Daniel J.; Chan, Wing-Le; Abe-Ouchi, Ayako (Journal article; Peer reviewed, 2021)
      In the Pliocene Model Intercomparison Project Phase 2 (PlioMIP2), coupled climate models have been used to simulate an interglacial climate during the mid-Piacenzian warm period (mPWP; 3.264 to 3.025 Ma). Here, we compare ...

    • Mid-Pliocene West African Monsoon rainfall as simulated in the PlioMIP2 ensemble 

      Berntell, Ellen; Zhang, Qiong; Li, Qiang; Haywood, Alan M.; Tindall, Julia C.; Hunter, Stephen J.; Zhang, Zhongshi; Xiangyu, Li; Guo, Chuncheng; Nisancioglu, Kerim Hestnes; Stepanek, Christian; Lohmann, Gerrit; Sohl, Linda E.; Chandler, Mark A.; Tan, Ning; Contoux, Camille; Ramstein, Gilles; Baatsen, Michiel L. J.; von der Heydt, Anna S.; Chandan, Deepak; Peltier, W. Richard; Abe-Ouchi, Ayako; Chan, Wing-Le; Kamae, Youichi; Williams, Charles J. R.; Lunt, Daniel J.; Feng, Ran; Otto-Bliesner, Bette L.; Brady, Esther C. (Journal article; Peer reviewed, 2021)
      The mid-Pliocene warm period (mPWP; ∼3.2 million years ago) is seen as the most recent time period characterized by a warm climate state, with similar to modern geography and ∼400 ppmv atmospheric CO2 concentration, and ...

    • A multi-model CMIP6-PMIP4 study of Arctic sea ice at 127 ka: sea ice data compilation and model differences 

      Kageyama, Masa; Sime, Louise C.; Sicard, Marie; Guarino, Maria-Vittoria; De Vernal, A; Stein, Ruediger; Schroeder, david; Malmierca-Vallet, Irene; Abe-Ouchi, Ayako; Bitz, Cecilia M.; Braconnot, Pascale; Brady, Esther C.; Cao, Jian; Chamberlain, Matthew; Feltham, Danny; Guo, Chuncheng; Legrande, Allegra N.; Lohmann, Gerrit; Meissner, Katrin; Menviel, Laurie; Nisancioglu, Kerim Hestnes; Otto-Bliesner, Bette L.; O'ishi, Ryouta; Ramos Buarque, Silvan; Salas y Mélia, David; Sherriff-Tadano, Sam; Stroeve, Julienne C.; Shi, Xiaoxu; Sun, Bo; Thomas, Robert; Volodin, Evgeny; Yeung, Nicholas K.H.; Zhang, Qiong; Zhang, Zhongshi; Zheng, Weipeng; Ziehn, Tilo (Journal article; Peer reviewed, 2021)
      The Last Interglacial period (LIG) is a period with increased summer insolation at high northern latitudes, which results in strong changes in the terrestrial and marine cryosphere. Understanding the mechanisms for this ...

    • 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 ...

    • Present day Jakobshavn Isbræ close to the Holocene minimum extent 

      Kajanto, Karita Anneli; Seroussi, Hélène; de Fleurian, Basile; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2020)
      Marine terminating glaciers evolve on millenial timescales in response to changes in oceanic and atmospheric conditions. However, the relative role of oceanic and atmospheric drivers remains uncertain. The evolution of ...

    • Quantifying Dynamical Proxy Potential Through Shared Adjustment Physics in the North Atlantic 

      Loose, Nora; Heimbach, Patrick; Pillar, H.R.; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2020)
      Oceanic quantities of interest (QoIs), for example, ocean heat content or transports, are often inaccessible to direct observation, due to the high cost of instrument deployment and logistical challenges. Therefore, ...

    • Rapid retreat of a Scandinavian marine outlet glacier in response to warming at the last glacial termination 

      Åkesson, Henning; Gyllencreutz, Richard; Mangerud, Jan; Svendsen, John-Inge; Nick, Faezeh M.; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2020)
      Marine outlet glaciers on Greenland are retreating, yet it is unclear if the recent fast retreat will persist, and how atmosphere and ocean warming will impact future retreat. We show how a marine outlet glacier in ...

    • Reduced El Niño variability in the mid-Pliocene according to the PlioMIP2 ensemble 

      Oldeman, Arthur M.; Baatsen, Michiel L. J.; Von Der Heydt, Anna S.; Dijkstra, Henk A.; Tindall, Julia C.; Abe-Ouchi, Ayako; Booth, Alice R.; Brady, Esther C.; Chan, Wing-Le; Chandan, Deepak; Chandler, Mark A.; Contoux, Camille; Feng, Ran; Guo, Chuncheng; Haywood, Alan M.; Hunter, Stephen J.; Kamae, Youichi; Li, Qiang; Li, Xiangyu; Lohmann, Gerrit; Lunt, Daniel J.; Nisancioglu, Kerim Hestnes; Otto-Bliesner, Bette L.; Peltier, W. Richard; Pontes, Gabriel M.; Ramstein, Gilles; Sohl, Linda E.; Stepanek, Christian; Tan, Ning; Zhang, Qiong; Zhang, Zhongshi; Wainer, Ilana; Williams, Charles J. R. (Journal article; Peer reviewed, 2021)
      The mid-Pliocene warm period (3.264–3.025 Ma) is the most recent geological period during which atmospheric CO2 levels were similar to recent historical values (∼400 ppm). Several proxy reconstructions for the mid-Pliocene ...

    • 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 ...