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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

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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) from past and ongoing glacial changes can amplify or mitigate ongoing relative sea level change. We present a high resolution VLM-model for the wider Arctic, that includes both present-day ice loading (PDIL) and glacial isostatic adjustment (GIA). The study shows that the non-linear elastic uplift from PDIL is significant (0.5-1 mm/y ) in most of the wider Arctic and exceeds GIA at 15 of 54 Arctic GNSSsites, including sites in non-glaciated areas of the North Sea region and the east coast of North America. Thereby the sea level change from PDIL (1.85 mm/y) is significantly mitigated from VLM caused by PDIL. The combined VLM-model was consistent with measured VLM at 85% of the GNSS-sites (R=0.77) and outperformed a GIA-only model (R=0.64). Deviations from GNSS-measured VLM can be attributed to local circumstances causing VLM.
16 Oct 2020Published in Geophysical Research Letters volume 47 issue 19. 10.1029/2020GL088144