Links between ocean temperature and iceberg discharge during Heinrich events

dc.contributor.authorÁlvarez Solas, Jorge
dc.contributor.authorCharbit, Sylvie
dc.contributor.authorRitz, Catherine
dc.contributor.authorPaillard, Didier
dc.contributor.authorRamstein, Gilles
dc.contributor.authorDumas, Christophe
dc.description© 2010 Macmillan Publishers Limited. All rights reserved. We thank M. Kageyama, D. Roche, K. Nisancioglu, T. Dokken, M. Montoya, F. Pattyn and B. Otto-Bliesner for helpful discussions. We are also very grateful to L. Tarasov for constructive comments, which helped us to improve the manuscript. This work was supported by the European programme NICE (Network for Ice sheet and Climate Evolution) and by the French National ANR project IDEGLACE.
dc.description.abstractPalaeoclimate records have revealed the presence of millennial-scale climate oscillations throughout the last glacial period(1). Six periods of extreme cooling in the Northern Hemisphere-known as Heinrich events-were marked by an enhanced discharge of icebergs into the North Atlantic Ocean(2,3), increasing the deposition of ice-rafted debris(2). Increased sliding at the base of ice sheets as a result of basal warming has been proposed to explain the iceberg pulses(4-6), but recent observations(7,8) suggest that iceberg discharge is related to a strong coupling between ice sheets, ice shelves and ocean conditions. Here we use a conceptual numerical model to simulate the effect of ocean temperature on ice-shelf width, as well as the impact of the resultant changes in ice-shelf geometry on ice-stream velocities. Our results demonstrate that ocean temperature oscillations affect the basal melting of the ice shelf and will generate periodic pulses of iceberg discharge in an ice sheet with a fringing shelf. We also find that the irregular occurrence of Heinrich events seen in the palaeoclimate records can be simulated by periodic ocean forcing combined with varying accumulation rates of the ice sheet. Our model simulations support a link between millennial-scale ocean temperature variability and Heinrich events during the last glacial period.
dc.description.departmentDepto. de Física de la Tierra y Astrofísica
dc.description.facultyFac. de Ciencias Físicas
dc.description.sponsorshipEuropean programme NICE (Network for Ice sheet and Climate Evolution)
dc.description.sponsorshipFrench National ANR project IDEGLACE
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dc.journal.titleNature Geoscience
dc.publisherNature Publishing Group
dc.rights.accessRightsrestricted access
dc.subject.keywordLaurentide Ice-Sheet
dc.subject.keywordLast Glacial Period
dc.subject.keywordRapid Changes
dc.subject.ucmAstronomía (Física)
dc.subject.ucmFísica atmosférica
dc.subject.unesco2501 Ciencias de la Atmósfera
dc.titleLinks between ocean temperature and iceberg discharge during Heinrich events
dc.typejournal article
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