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GPS-observed elastic deformation due to surface mass balance variability in the Southern Antarctic Peninsula

Koulali, A, Whitehouse, PL, Clarke, PJ, van den Broeke, MR, Nield, GA, King, MA ORCID: 0000-0001-5611-9498, Bentley, MJ, Wouters, B and Wilson, T 2022 , 'GPS-observed elastic deformation due to surface mass balance variability in the Southern Antarctic Peninsula' , Geophysical Research Letters , doi:

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In Antarctica, GPS vertical time series exhibit non-linear signals over a wide range of temporal scales. To explain these non-linearities, a number of hypotheses have been proposed, among them the short-term rapid solid Earth response to contemporaneous ice mass change. Here we use GPS vertical time series to reveal the solid Earth response to variations in surface mass balance (SMB) in the Southern Antarctic Peninsula (SAP). At four locations in the SAP we show that interannual variations of SMB anomalies cause measurable elastic deformation. We use regional climate model SMB products to calculate the induced displacement assuming a perfectly elastic Earth. Our results show a reduction of the misfit when fitting a linear trend to GPS time series corrected for the elastic response to SMB variations. Our results imply that, for a better understanding of the glacial isostatic adjustment (GIA) signal in Antarctica, SMB variability must be considered.

Item Type: Article
Authors/Creators:Koulali, A and Whitehouse, PL and Clarke, PJ and van den Broeke, MR and Nield, GA and King, MA and Bentley, MJ and Wouters, B and Wilson, T
Journal or Publication Title: Geophysical Research Letters
Publisher: Amer Geophysical Union
ISSN: 0094-8276
DOI / ID Number:
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© 2022. The Authors.This is an open access article under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License, ( which permits use, distribution and reproduction in any medium, provided the original work is properly cited

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