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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cp-2018-129
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2018-129
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 09 Oct 2018

Research article | 09 Oct 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Impact of millennial-scale oceanic variability on the Greenland ice sheet evolution throughout the Last Glacial Period

Ilaria Tabone1,2, Alexander Robinson1,2,a, Jorge Alvarez-Solas1,2, and Marisa Montoya1,2 Ilaria Tabone et al.
  • 1Universidad Complutense de Madrid, 28040 Madrid, Spain
  • 2Instituto de Geociencias, Consejo Superior de Investigaciones Cientificas-Universidad Complutense de Madrid, 28040 Madrid, Spain
  • anow at: Faculty of Geology and Geoenvironment, University of Athens, 15784 Athens, Greece

Abstract. Temperature reconstructions from Greenland ice sheet (GrIS) ice cores indicate the occurrence of more than twenty abrupt warmings during the Last Glacial Period (LGP) known as Dansgaard-Oeschger (D-O) events. Although their ultimate cause is still debated, evidence from both proxy data and modelling studies robustly links these to reorganisations of the Atlantic Meridional Overturning Circulation (AMOC). During the LGP, the GrIS expanded as far as the continental shelf break and was thus more directly exposed to oceanic changes than in the present. Therefore oceanic temperature fluctuations on millennial timescales could have had a non-negligible impact on the GrIS. Here we assess the effect of millennial-scale oceanic variability on the GrIS evolution from the last interglacial to the present day. To do so, we use a three-dimensional hybrid ice-sheet-shelf model forced by oceanic fluctuations derived from paleo records. We show that the GrIS evolution during the LGP could have been strongly influenced by oceanic changes on millennial timescales, leading to ocean-induced ice volume contributions more than 1.5m SLE. Several regions across the GrIS could thus have been responsible for ice mass discharge during D-O events, opening the possibility of a non-negligible role of the GrIS in oceanic reorganisations throughout the LGP.

Ilaria Tabone et al.
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Ilaria Tabone et al.
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Short summary
We study the impact of millennial-scale variability in the ocean on the Greenland Ice Sheet (GrIS) evolution during the Last Glacial Period (LGP) through a 3D hybrid ice-sheet-shelf model. We show that the GrIS may have strongly reacted to abrupt oceanic variations during the LGP, contributing to more than 1.5 m SLE in sea-level rise as a result of intense ice discharge. Our results open the chance for a non-negligible role of the GrIS in millennial-scale oceanic reorganisations during the LGP.
We study the impact of millennial-scale variability in the ocean on the Greenland Ice Sheet...
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