Warm Nordic Seas delayed glacial inception in Scandinavia

Born, Andreas; Kageyama, Masa; Nisancioglu, Kerim H.

doi:10.5194/cp-6-817-2010

Cited by 23 publications

(20 citation statements)

References 36 publications

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“…For example, Kubatzki et al (2006), using a fully coupled climateice-sheet EMIC, showed that during the last glacial inception (≈ 113 kyr BP in their study) the growth of the Laurentide ice sheet could have been delayed by modulating the state of ocean and vegetation. In the same line, Born et al (2010) suggest that, during the last glacial inception (≈ 115 kyr BP), the growth of the Eurasian ice sheet was delayed by a persistent high oceanic heat transport towards the Northern Hemisphere high-latitude regions.…”

Section: F Colleoni Et Al: Investigating Mis 5 and Mis 7 Glacial Insupporting

confidence: 50%

“…In the recent work of Herrington and Poulsen (2012) about the last glacial inception (≈ 115 kyr BP) over North America, no explicit ice shelves are simulated, but their ISM allows for floating ice over areas where ocean depth does not exceed 750 m. The limitation of this method resides in the fact that it may partly limit the growth of ice over oceanic regions deeper than 750 meters and as a consequence may induce incorrect ice distribution and volume. It is worth noting that in our ISM, ice shelves are explicitly simulated but a melting rate of 2.45 m yr −1 is prescribed below the shelves for ocean depths larger than 450 m. Born et al (2010) focused on the entire Northern Hemisphere but no ice shelf dynamics was considered. They argued that given the low ice volume observed during the last inception, the treatment of the marine part was of minor importance.…”

Section: F Colleoni Et Al: Investigating Mis 5 and Mis 7 Glacial Inmentioning

confidence: 99%

“…Numerous studies have tackled the glacial inception issue using different modeling methods: atmospheric general circulation models (AGCM, e.g., Rind et al, 1989;Dong and Valdes, 1995;Vettoretti and Peltier, 2003); coupled atmosphere-ocean GCMs (AOGCM, e.g., Khodri et al, 2001;Yoshimori et al, 2002); earth system models of intermediate complexity (EMIC, e.g., Meissner et al, 2003); asynchronous coupling between three-dimensional ice-sheet model (ISM) and AGCM (e.g., Peyaud et al, 2007;Herrington and Poulsen, 2012) or AOGCM (e.g., Born et al, 2010); three-dimensional ISM coupled to EMIC (e.g., Calov and Marsiat, 1998;Bonelli et al, 2009;Ganopolski et al, 2010;Ganopolski and Calov, 2012); coupled threedimensional ISM to AOGCM (e.g., Gregory et al, 2012). The majority of paleoclimate modeling studies have focused on the last glacial inception (≈ 115 kyr BP) and have…”

Section: Introductionmentioning

confidence: 99%

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Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions

et al. 2014

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Abstract. The present manuscript compares Marine Isotope Stage 5 (MIS 5, 125-115 kyr BP) and MIS 7 (236-229 kyr BP) with the aim to investigate the origin of the difference in ice-sheet growth over the Northern Hemisphere high latitudes between these last two inceptions. Our approach combines a low resolution coupled atmosphereocean-sea-ice general circulation model and a 3-D thermomechanical ice-sheet model to simulate the state of the ice sheets associated with the inception climate states of MIS 5 and MIS 7. Our results show that external forcing (orbitals and GHG) and sea-ice albedo feedbacks are the main factors responsible for the difference in the land-ice initial state between MIS 5 and MIS 7 and that our cold climate model bias impacts more during a cold inception, such as MIS 7, than during a warm inception, such as MIS 5. In addition, if proper ice-elevation and albedo feedbacks are not taken into consideration, the evolution towards glacial inception is hardly simulated, especially for MIS 7. Finally, results highlight that while simulated ice volumes for MIS 5 glacial inception almost fit with paleo-reconstructions, the lack of precipitation over high latitudes, identified as a bias of our climate model, does not allow for a proper simulation of MIS 7 glacial inception.

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Section: F Colleoni Et Al: Investigating Mis 5 and Mis 7 Glacial Insupporting

confidence: 50%

Section: F Colleoni Et Al: Investigating Mis 5 and Mis 7 Glacial Inmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions

et al. 2014

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“…1) around 4.5 Ma. The establishment of the cold EGC, as a potential response to changes in the ocean circulation through the Bering Strait, has been considered important for large-scale glaciation of Greenland because the EGC thermally isolates Greenland from the warm waters transported northward in the Norwegian Atlantic Current (NwAC) (Bohrmann et al, 1990;Sarnthein et al, 2009;De Schepper et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Highly variable Pliocene sea surface conditions in the Norwegian Sea

et al. 2017

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“…A polar azimuthal projection is used as a grid base. The lateral grid is identical to the one of SICOPOLIS (Greve, 1997;Born et al, 2010).…”

Section: Model Domainmentioning

confidence: 99%

An ice sheet model of reduced complexity for paleoclimate studies

2016

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Abstract. IceBern2D is a vertically integrated ice sheet model to investigate the ice distribution on long timescales under different climatic conditions. It is forced by simulated fields of surface temperature and precipitation of the Last Glacial Maximum and present-day climate from a comprehensive climate model. This constant forcing is adjusted to changes in ice elevation. Due to its reduced complexity and computational efficiency, the model is well suited for extensive sensitivity studies and ensemble simulations on extensive temporal and spatial scales. It shows good quantitative agreement with standardized benchmarks on an artificial domain (EISMINT). Present-day and Last Glacial Maximum ice distributions in the Northern Hemisphere are also simulated with good agreement. Glacial ice volume in Eurasia is underestimated due to the lack of ice shelves in our model.The efficiency of the model is utilized by running an ensemble of 400 simulations with perturbed model parameters and two different estimates of the climate at the Last Glacial Maximum. The sensitivity to the imposed climate boundary conditions and the positive degree-day factor β, i.e., the surface mass balance, outweighs the influence of parameters that disturb the flow of ice. This justifies the use of simplified dynamics as a means to achieve computational efficiency for simulations that cover several glacial cycles. Hysteresis simulations over 5 million years illustrate the stability of the simulated ice sheets to variations in surface air temperature.

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Warm Nordic Seas delayed glacial inception in Scandinavia

Cited by 23 publications

References 36 publications

Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions

Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions

Highly variable Pliocene sea surface conditions in the Norwegian Sea

An ice sheet model of reduced complexity for paleoclimate studies

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