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Time-varying uplift in Svalbard — an effect of glacial changes

Kierulf, Halfdan Pascal and Kohler, Jack and Boy, Jean-Paul and Geyman, Emily C. and Mémin, Anthony and Omang, Ove C. D. and Steffen, Holger and Steffen, Rebekka (2022) Time-varying uplift in Svalbard — an effect of glacial changes. Geophysical Journal International, 231 (3). pp. 1518-1534. ISSN 0956-540X. doi:10.1093/gji/ggac264.

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We analyse Global Navigation Satellite System (GNSS) data from Svalbard to understand how uplift rates are controlled by the elastic and viscoelastic response of the solid Earth to changes in glacier mass on annual, interannual, decadal, centennial and millennial timescales. To reveal local patterns of deformation, we filter the GNSS time-series with an enhanced common-mode filtering technique where the non-tidal loading signal is incorporated. This technique reduces the estimated uncertainties for 5-yr time-series from 0.8 to 0.3 mm yr–1. Analysis of the GNSS data with different software–GAMIT, GipsyX, and GINS–produce consistent results that all indicate large temporal variations in uplift. For example, at the Ny-Ålesund GNSS station, uplift varies between 6 and 12 mm yr–1 for different 5-yr periods, and also shows a significant increase in the last 15 yr. We show that this increase is due to climate change-related ice mass loss in Svalbard. We constrain recent glacier retreat on Svalbard using a series of digital elevation models, and then correct the GNSS-derived uplift records for the elastic signal from these ice mass changes. The residual uplift signal is relatively constant, confirming the hypothesis that current ice mass changes exert a strong influence on GNSS observations. The relatively constant record of residual uplift can be used to constrain other geophysical signals such as the viscoelastic response of the solid Earth to ice loading during the Little Ice Age and the Last Glacial Period. We review uplift results from previous viscoelastic modelling studies and show that the residual signal cannot yet be fully explained. Our new uplift results thus motivate the need for new viscoelastic modelling of the glacial isostatic adjustment process in Svalbard.

Item Type:Article
Related URLs:
URLURL TypeDescription
Boy, Jean-Paul0000-0003-0259-209X
Geyman, Emily C.0000-0003-4349-9350
Mémin, Anthony0000-0003-2931-9034
Omang, Ove C. D.0000-0002-0291-7950
Additional Information:We thank the editor Prof Bert Vermeersen, Shfaqat Abbas Khan and one anonymous reviewer for their constructive comments that helped to improve the manuscript. We would like to thank Giorgio Spada for making freely available his TABOO software.
Issue or Number:3
Record Number:CaltechAUTHORS:20220823-625016100
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:116383
Deposited By: Melissa Ray
Deposited On:25 Aug 2022 14:33
Last Modified:25 Aug 2022 14:33

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