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Influence of 3D Earth structure on Glacial Isostatic Adjustment in the Russian Arctic
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  • Tanghua Li,
  • Nicole Khan,
  • Alisa Baranskaya,
  • Timothy Shaw,
  • W Richard Peltier,
  • Gordan Stuhne,
  • Patrick Wu,
  • Benjamin P Horton
Tanghua Li
Nanyang Technological University

Corresponding Author:li.tanghua@ntu.edu.sg

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Nicole Khan
The University of Hong Kong
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Alisa Baranskaya
Lomonosov Moscow State University
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Timothy Shaw
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W Richard Peltier
Department of Physics, University of Toronto
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Gordan Stuhne
University of Toronto
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Patrick Wu
University of Calgary
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Benjamin P Horton
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We validate 1D glacial isostatic adjustment (GIA) models ICE-6G_C (VM5a) and ICE-7G_NA (VM7), and new 3D GIA models in the Russian Arctic against a quality-controlled deglacial relative sea-level (RSL) database. The 1D models correspond to the RSL data along the southern coast of Barents Sea and Franz-Josef-Land, but show notable misfits with the White Sea data. We find 3D models fit better than 1D models around the White Sea while retaining comparable fits in other regions of the Russian Arctic. Our results reveal (1) RSL in the western Russian Arctic is sensitive to laterally varying lithosphere and 3D viscosity structure in the upper mantle; and (2) RSL in the whole Russian Arctic is less sensitive to 3D viscosity structure in the lower mantle compared to the upper mantle. The 3D models reveal a compromise in the upper mantle between background viscosity and scaling factor to best fit the RSL data.
Mar 2022Published in Journal of Geophysical Research: Solid Earth volume 127 issue 3. 10.1029/2021JB023631