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An investigation of the possibility of non-Laurentide ice stream contributions to Heinrich event 3

Published online by Cambridge University Press:  24 November 2020

Jesse Velay-Vitow Open the ORCID record for Jesse Velay-Vitow [Opens in a new window] ,
W. Richard Peltier  and
Gordan R. Stuhne
Jesse Velay-Vitow*
Affiliation:
Department of Physics, University of Toronto, 60 St. George St, Toronto, Ontario, M5S 1A7
W. Richard Peltier
Affiliation:
Department of Physics, University of Toronto, 60 St. George St, Toronto, Ontario, M5S 1A7
Gordan R. Stuhne
Affiliation:
Department of Physics, University of Toronto, 60 St. George St, Toronto, Ontario, M5S 1A7
*
*Corresponding author e-mail address: Jvitow@physics.utoronto.ca (J. Velay-Vitow).
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Abstract

The ocean floor sedimentological signature of Heinrich event 3 (H3) is markedly different from that of other Heinrich events that are known to have originated in Hudson Strait. It has therefore been suggested that the H3 contribution to iceberg flux may have been delivered by ice streams located in the eastern sector of the North Atlantic, from the Fennoscandian or British Isles ice sheets. To investigate this possibility and whether the instability involved may have been tidally induced, as seems to have been the case for H1, we consider several eastern Atlantic sector possibilities: a hypothetical Barents Sea ice stream, the Norwegian ice stream, and the Irish Sea ice stream. We find that the extremely high amplitude of the M2 tidal constituent in the western North Atlantic that appears to have forced H1 did not exist in the northeastern Atlantic. This suggests that, with one possible exception, if destabilized ice streams in this region did contribute to H3, tidal forcing was most probably not the cause. The single exception to this general conclusion may be the Irish Sea ice stream, and we comment on the probability of a contribution to H3 from this source.

Keywords

Heinrich eventsHeinrich event 3Marine Isotope Stage 3Sea level historyIce-Earth-Ocean Interaction
Type
Thematic Set: Heinrich Events
Information
Quaternary Research , Volume 101 , May 2021 , pp. 13 - 25
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Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2020

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