148851 - GPS-observed elastic deformation due to surface mass balance variability in the Southern Antarctic Peninsula.pdf (1.77 MB)
GPS-observed elastic deformation due to surface mass balance variability in the Southern Antarctic Peninsula
journal contribution
posted on 2023-05-21, 05:49 authored by Koulali, A, Whitehouse, PL, Clarke, PJ, van den Broeke, MR, Nield, GA, Matt KingMatt King, Bentley, MJ, Wouters, B, Wilson, TIn 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.
Funding
Australian Research Council
Australian National University
Curtin University
University of Canberra
University of Melbourne
University of New South Wales
University of South Australia
University of Western Australia
History
Publication title
Geophysical Research LettersArticle number
e2021GL097109Number
e2021GL097109ISSN
0094-8276Department/School
School of Geography, Planning and Spatial SciencesPublisher
Amer Geophysical UnionPlace of publication
2000 Florida Ave Nw, Washington, USA, Dc, 20009Rights statement
© 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, (https://creativecommons.org/licenses/by/4.0/) which permits use, distribution and reproduction in any medium, provided the original work is properly citedRepository Status
- Open