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Surface accumulation in Northern Central Greenland during the last 300 years

  • Nanna B. Karlsson (a1) (a2), Sebastian Razik (a1) (a3), Maria Hörhold (a1), Anna Winter (a1), Daniel Steinhage (a1), Tobias Binder (a1) and Olaf Eisen (a1) (a3)...

Abstract

The internal stratigraphy of snow and ice as imaged by ground-penetrating radar may serve as a source of information on past accumulation. This study presents results from two ground-based radar surveys conducted in Greenland in 2007 and 2015, respectively. The first survey was conducted during the traverse from the ice-core station NGRIP (North Greenland Ice Core Project) to the ice-core station NEEM (North Greenland Eemian Ice Drilling). The second survey was carried out during the traverse from NEEM to the ice-core station EGRIP (East Greenland Ice Core Project) and then onwards to Summit Station. The total length of the radar profiles is 1427 km. From the radar data, we retrieve the large-scale spatial variation of the accumulation rates in the interior of the ice sheet. The accumulation rates range from 0.11 to 0.26 m a−1 ice equivalent with the lowest values found in the northeastern sector towards EGRIP. We find no evidence of temporal or spatial changes in accumulation rates when comparing the 150-year average accumulation rates with the 321-year average accumulation rates. Comparisons with regional climate models reveal that the models underestimate accumulation rates by up to 35% in northeastern Greenland. Our results serve as a robust baseline to detect present changes in either surface accumulation rates or patterns.

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Copyright

This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is included and the original work is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use.

Corresponding author

Author for correspondence: Nanna B. Karlsson, E-mail: nbk@geus.dk

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Keywords

Surface accumulation in Northern Central Greenland during the last 300 years

  • Nanna B. Karlsson (a1) (a2), Sebastian Razik (a1) (a3), Maria Hörhold (a1), Anna Winter (a1), Daniel Steinhage (a1), Tobias Binder (a1) and Olaf Eisen (a1) (a3)...

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