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Vertical Land Motion from present-day deglaciation in the wider Arctic
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  • Carsten Ludwigsen,
  • Shfaqat Abbas Khan,
  • Ole Baltazar Andersen,
  • Ben Marzeion
Carsten Ludwigsen
Technical Univeresity of Denmark, Technical Univeresity of Denmark

Corresponding Author:caanlu@space.dtu.dk

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Shfaqat Abbas Khan
DTU Space, DTU Space
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Ole Baltazar Andersen
DTU Space, National Space Institute, DTU Space, National Space Institute
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Ben Marzeion
University of Bremen, University of Bremen
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Vertical land motion (VLM) of Earth’s surface can aggravate or mitigate ongoing relative sea level change. The near-linear process of Glacial Isostatic Adjustment (GIA) is normally assumed to govern regional VLM. However, present-day deglaciation of primarily the Greenland Ice Sheet causes a significant non-linear elastic uplift of >1 mm yr −1 in most of the wider Arctic. The elastic VLM exceeds GIA at 14 of 42 Arctic GNSS-sites, including sites in non-glaciated areas in the North Sea region and along the east coast of North America. The combined elastic VLM + GIA model is consistent with measured VLM at three-fourth of the GNSS-sites (R=0.74), which outperforms a GIA-only model (R=0.60). Deviations from GNSS-measured VLM, are interpreted as estimates of local circumstances causing VLM. Future accelerated ice loss on Greenland, will increase the significance of elastic uplift for North America and Northern Europe and become important for coastal sea level projections.
16 Oct 2020Published in Geophysical Research Letters volume 47 issue 19. 10.1029/2020GL088144