Holocene palaeoceanography of the Northeast Greenland shelf
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Published:2022-01-20
Issue:1
Volume:18
Page:103-127
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ISSN:1814-9332
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Container-title:Climate of the Past
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language:en
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Short-container-title:Clim. Past
Author:
Pados-Dibattista Teodora, Pearce ChristofORCID, Detlef HenriekaORCID, Bendtsen JørgenORCID, Seidenkrantz Marit-SolveigORCID
Abstract
Abstract. The Northeast Greenland shelf is highly sensitive to
climate and ocean variability because it is swept by the East Greenland
Current, which, through the western Fram Strait, forms the main pathway of
export of sea ice and cold water masses from the Arctic Ocean into the North
Atlantic Ocean. In order to reconstruct the variability of the East
Greenland Current and general palaeoceanographic conditions in the area
during the Holocene, we carried out benthic foraminiferal assemblage, stable
isotope, and sedimentological analyses of a marine sediment core retrieved
from the Northeast Greenland shelf (core DA17-NG-ST07-73G). The results
reveal significant variations in the water masses and thus in the strength
of the East Greenland Current over the last ca. 9.4 kyr. Between 9.4 and
8.2 ka the water column off Northeast Greenland was highly stratified,
with cold, sea-ice-loaded surface waters and a strong influx of warm Atlantic
Water in the subsurface. At ∼ 8.4 ka a short-lived peak in
terrestrial elements may be linked to an influx of iceberg-transported
sediments and thus to the so-called 8.2 ka event. Conditions similar to those of the Holocene Thermal Maximum prevailed from 8.2 to 6.2 ka, with a strong influence of
the Return Atlantic Current and a weakened transport of Polar Water in the
upper East Greenland Current. After 6.2 ka we recorded a return to a more
stratified water column with sea-ice-loaded surface waters and still
Atlantic-sourced subsurface waters. After 4.2 ka increased Polar Water at
the surface of the East Greenland Current and a reduction in the Return
Atlantic Water at subsurface levels signifies freshening and reduced
stratification of the water column and (near) perennial sea-ice cover. The
neoglaciation started at 3.2 ka at our location, characterized by a
strengthened East Greenland Current. Cold subsurface-water conditions with
possible sea-ice cover and minimum surface-water productivity persisted here
throughout the last ∼ 3 kyr.
Publisher
Copernicus GmbH
Subject
Paleontology,Stratigraphy,Global and Planetary Change
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