A mid-Holocene shift in Arctic sea-ice variability on the East Greenland Shelf

Bibliographic Data

ID12266490
AuthorsAnne Jennings (0000-0003-3176-2916, University of Colorado Boulder, corresponding author), Anne E Jennings (INSTAAR and Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309–0450, USA), Karen Luise Knudsen (0000-0002-4006-3618, Department of Earth Sciences, University of Aarhus, DK-8000, Århus, C, Denmark), Morten Hald (Department of Geology, University of Tromsø, N-9037 Tromsø, Norway), Carsten Vigen Hansen (Department of Earth Sciences, University of Aarhus, DK-8000, Århus, C, Denmark), John T Andrews (0000-0003-3169-5979, INSTAAR and Department of Geological Sciences, University of Colorado, Boulder, Colorado 80309–0450, USA)
Year2002
Volume12
Issue1
Pages49-58
Publication date2002-01-01
Peer ReviewedYes
Open AccessYes
TypeARTICLE
VenueThe Holocene (JOURNAL)
Journal identifiersISSN: 0959-6836 • E-ISSN: 1477-0911
PublisherSAGE Publishing (PUBLISHER • US)
DOI10.1191/0959683602hl519rp
OpenAlexW1976840776
LanguageEN
Citations received34
References cited58

Records of iceberg-rafting and palaeohydrography from two East Greenland shelf cores (JM96-1206/1-GC and JM96-1207/1-GC) are reported. Benthic foraminifera, stable isotopes and IRD fluxes indicate a shift toward colder, lower-salinity ‘polar’ conditions c. 5 cal. ka. A new proxy of iceberg-rafting on the East Greenland Shelf is the flux of calcium carbonate (TIC) thought to be derived from glacial erosion of Cretaceous calcareous mudstones. A change in the regularity and spacing of carbonate flux peaks at c. 4.7 cal. ka in JM96-1207 coincides with the onset of Neoglacial cooling in the Renland ice core δ18O record. We propose that the carbonate flux peaks between 4.7 and 0.4 cal. ka are related to sea-surface coolings associated with increased flux of polar water and sea ice in the East Greenland Current. These peaks are synchronous with sea-surface coolings interpreted from North Atlantic deep-sea cores, but additional peaks centred around 2.4 and 3.8 cal. ka in JM96-1207 suggest that the shelf site captures higher-frequency events. The data indicate that severe Arctic sea-ice events began in the Neoglacial interval, and that earlier-Holocene cool events in deep-sea records are associated with other processes, such as release of meltwater from residual glacier ice and glacial lakes

Arctic · Arctic ice pack · Benthic zone · Foraminifera · Glacial period · Holocene · Ice core · Iceberg · Meltwater · Sea ice · Stable isotope ratio · δ18O · Geological formations and processes · Geology and Paleoclimatology Research · Methane Hydrates and Related Phenomena · Geology · Oceanography · Paleontology