Blar i Department of Earth Science på forfatter "Nisancioglu, Kerim Hestnes"
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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, ... -
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 ... -
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 ... -
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 ... -
Simulating last interglacial climate with NorESM: role of insolation and greenhouse gases in the timing of peak warmth
Langebroek, Petra; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2014-07-10)The last interglacial (LIG, ~130–116 ka, ka = 1000 yr ago) is characterized by high-latitude warming and is therefore often considered as a possible analogue for future warming. However, in contrast to predicted ... -
Topological Constraints by the Greenland–Scotland Ridge on AMOC and Climate
Rheinlænder, Jonathan Winfield; Ferreira, David; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2020)Changes in the geometry of ocean basins have been influential in driving climate change throughout Earth’s history. Here, we focus on the emergence of the Greenland–Scotland Ridge (GSR) and its influence on the ocean state, ... -
Transient Increase in Arctic Deep-Water Formation and Ocean Circulation under Sea Ice Retreat
Bretones, Anais Magali; Nisancioglu, Kerim Hestnes; Jensen, Mari Fjalstad; Brakstad, Ailin; Yang, Shuting (Journal article; Peer reviewed, 2021)While a rapid sea ice retreat in the Arctic has become ubiquitous, the potential weakening of the Atlantic meridional overturning circulation (AMOC) in response to global warming is still under debate. As deep mixing occurs ... -
Unraveling the mechanisms and implications of a stronger mid-Pliocene Atlantic Meridional Overturning Circulation (AMOC) in PlioMIP2
Weiffenbach, Julia E.; Baatsen, Michiel L. J.; Dijkstra, Henk A.; Von Der Heydt, Anna S.; Abe-Ouchi, Ayako; Brady, Esther C.; Chan, Wing-Le; Chandan, Deepak; Chandler, Mark A.; Contoux, Camille; Feng, Ran; Guo, Chuncheng; Han, Zixuan; Haywood, Alan M.; Li, Qiang; Li, Xiangyu; Lohmann, Gerrit; Lunt, Daniel J.; Nisancioglu, Kerim Hestnes; Otto-Bliesner, Bette L.; Peltier, W. Richard; Ramstein, Gilles; Sohl, Linda E.; Stepanek, Christian; Tan, Ning; Tindall, Julia C.; Williams, Charles J. R.; Zhang, Qiong; Zhang, Zhongshi (Journal article; Peer reviewed, 2023)The mid-Pliocene warm period (3.264–3.025 Ma) is the most recent geological period in which the atmospheric CO2 concentration was approximately equal to the concentration we measure today (ca. 400 ppm). Sea surface temperature ...