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Spatial and temporal Antarctic Ice Sheet mass trends, glacio-isostatic adjustment, and surface processes from a joint inversion of satellite altimeter, gravity, and GPS data
Citation
Martin-Espanol, A and Zammit-Mangion, A and Clarke, PJ and Flament, T and Helm, V and King, MA and Luthcke, SB and Petrie, E and Remy, F and Schon, N and Wouters, B and Bamber, JL, Spatial and temporal Antarctic Ice Sheet mass trends, glacio-isostatic adjustment, and surface processes from a joint inversion of satellite altimeter, gravity, and GPS data, Journal of Geophysical Research: Earth Surface, 121, (2) pp. 182-200. ISSN 2169-9003 (2016) [Refereed Article]
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Copyright Statement
© 2015 The Authors. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/
Abstract
We present spatiotemporal mass balance trends for the Antarctic Ice Sheet from a statistical inversion of satellite altimetry, gravimetry, and elastic-corrected GPS data for the period 2003–2013. Our method simultaneously determines annual trends in ice dynamics, surface mass balance anomalies, and a time-invariant solution for glacio-isostatic adjustment while remaining largely independent of forward models. We establish that over the period 2003–2013, Antarctica has been losing mass at a rate of −84 ± 22 Gt yr−1, with a sustained negative mean trend of dynamic imbalance of −111 ± 13 Gt yr−1. West Antarctica is the largest contributor with −112 ± 10 Gt yr−1, mainly triggered by high thinning rates of glaciers draining into the Amundsen Sea Embayment. The Antarctic Peninsula has experienced a dramatic increase in mass loss in the last decade, with a mean rate of −28 ± 7 Gt yr−1 and significantly higher values for the most recent years following the destabilization of the Southern Antarctic Peninsula around 2010. The total mass loss is partly compensated by a significant mass gain of 56 ± 18 Gt yr−1 in East Antarctica due to a positive trend of surface mass balance anomalies.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | glacial isostatic adjustment, GPS, Antarctica, ice |
| Research Division: | Engineering |
| Research Group: | Geomatic Engineering |
| Research Field: | Geodesy |
| Objective Division: | Expanding Knowledge |
| Objective Group: | Expanding Knowledge |
| Objective Field: | Expanding Knowledge in the Earth Sciences |
| Author: | King, MA (Professor Matt King) |
| ID Code: | 106994 |
| Year Published: | 2016 |
| Funding Support: | Australian Research Council (FT110100207) |
| Web of Science® Times Cited: | 19 |
| Deposited By: | Geography and Spatial Science |
| Deposited On: | 2016-02-29 |
| Last Modified: | 2017-10-24 |
| Downloads: | 77 View Download Statistics |
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