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Climate of the Past An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/cp-2020-19
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2020-19
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 24 Feb 2020

Submitted as: research article | 24 Feb 2020

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This preprint is currently under review for the journal CP.

High-frequency climate oscillations in the Holocene from a coastal-dome ice core in east central Greenland

Abigail G. Hughes1, Tyler R. Jones1, Bo M. Vinther2, Vasileios Gkinis2, C. Max Stevens3, Valerie Morris1, Bruce H. Vaughn1, Christian Holme2, Bradley R. Markle4, and James W. C. White1 Abigail G. Hughes et al.
  • 1Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, Colorado, USA
  • 2Physics of Ice, Climate and Earth, The Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
  • 3Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA
  • 4California Institute of Technology, Pasadena, California, USA

Abstract. An ice core drilled on the Renland Ice Cap in east-central Greenland contains a continuous climate record dating through the last glacial period. The Renland record is valuable because the coastal environment is more likely to reflect regional sea surface conditions, compared to inland Greenland ice cores that capture synoptic variability. Here we present the δ18O water isotope record for the Holocene, in which decadal-scale climate information is retained for the last 8 ka, and the annual water isotope signal is preserved throughout the last 2.6 ka. To investigate regional climate information preserved in the water isotope record, we apply spectral analysis techniques to a 300-year moving window to determine the mean strength of varying frequency bands through time. The strength of interannual frequency bands decays rapidly, but we find that the mean 15–20 year δ18O variability exhibits a millennial-scale cycle in line with the well-known Bond Cycle. Comparison to other North Atlantic proxy records suggests that the 15–20 year variability may reflect fluctuating sea ice conditions throughout the Holocene, driven by changes in the strength of the Atlantic Meridional Overturning Circulation. Additional analysis of the seasonal signal over the last 2.6 ka reveals that the winter δ18O signal has experienced a decreasing trend, while the summer signal has predominantly remained stable. The winter trend likely corresponds to an increase in Arctic sea ice cover, driven by a decrease in total annual insolation. In the context of anthropogenic climate change, the winter trend may have important implications for feedback processes as sea ice retreats in the Arctic.

Abigail G. Hughes et al.

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Abigail G. Hughes et al.

Abigail G. Hughes et al.

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Short summary
An ice core drilled on the Renland Ice Cap in east-central Greenland contains a continuous climate record dating through the last glacial period. Here we present the water isotope record for the Holocene, in which high-resolution climate information is retained for the last 8 ka. We find that the Renland water isotope record reflects regional sea surface conditions, with water isotope variability corresponding to fluctuations in ocean circulation patterns and sea ice cover.
An ice core drilled on the Renland Ice Cap in east-central Greenland contains a continuous...
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