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      High-resolution record of late glacial and deglacial sea ice changes in Fram Strait corroborates ice–ocean interactions during abrupt climate shifts

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      General Information:

      Citation:
      Müller, J. and Stein, R. (2014): High-resolution record of late glacial and deglacial sea ice changes in Fram Strait corroborates ice–ocean interactions during abrupt climate shifts , Earth and Planetary Science Letters, 403 , pp. 446-455 . doi: 10.1016/j.epsl.2014.07.016
      Cite this page as:
      hdl:10013/epic.44001
      DOI:
      https://doi.org/10.1016/j.epsl.2014.07.016
      Official URL:
      https://doi.org/10.1016/j.epsl.2014.07.016
      Contact Email:
      Juliane.Mueller@awi.de
      Related Data:

      Abstract:

      The transition from last glacial to deglacial and subsequently to modern interglacial climate conditions was accompanied by abrupt shifts in the palaeoceanographic setting in the subpolar North Atlantic. Knowledge about the role that sea ice coverage played during these rapid climate reversals is limited since most marine sediment cores from the higher latitudes provide only a coarse temporal resolution and often poorly preserved microfossils. Here we present a highly resolved reconstruction of sea ice conditions that characterised the eastern Fram Strait – a key area for water mass exchange between the Arctic Ocean and the North Atlantic – for the past 30 ka BP. This reconstruction is based on the distribution of the sea ice biomarker IP25 and phytoplankton derived biomarkers in a sediment core from the continental slope of western Svalbard. During the late glacial (30 ka to 19 ka BP), recurrent advances and retreats of sea ice characterised the study area and point to a hitherto less considered oceanic (and/or atmospheric) variability. A long-lasting perennial sea ice coverage in eastern Fram Strait persisted only at the very end of the Last Glacial Maximum (i.e. from 19.2 to 17.6 ka BP) and was abruptly reduced at the onset of Heinrich Event 1 – coincident with or possibly even inducing the collapse of the Atlantic Meridional Overturning Circulation (AMOC). Further maximum sea ice conditions prevailed during the Younger Dryas cooling event and support the assumption of an AMOC reduction due to increased formation and export of Arctic sea ice through Fram Strait. A significant retreat of sea ice and sea surface warming are observed for the Early Holocene.

      Further Details:

      Item Type:
      Article
      Authors:
      Müller, Juliane ; Stein, Rüdiger
      Divisions:
      AWI Organizations > Geosciences > Marine Geology and Paleontology
      Primary Division:
      Organizations > AWI Organizations > Geosciences > Marine Geology and Paleontology
      Programs:
      Helmholtz Research Programs > PACES II (2014-2018) > TOPIC 3: The earth system from a polar perspective > WP 3.1: Circumpolar climate variability and global teleconnections at seasonal to orbital time scales
      Primary Topic:
      Helmholtz Programs > Helmholtz Research Programs > PACES II (2014-2018) > TOPIC 3: The earth system from a polar perspective > WP 3.1: Circumpolar climate variability and global teleconnections at seasonal to orbital time scales
      Eprint ID:
      36143
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