An assessment of forward and inverse GIA solutions for Antarctica

Alba Martin Espanol*, Matt King, Andrew Zammit Mangion, Stuart Andrews, Philip Moore, Jonathan Bamber

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

28 Citations (Scopus)
279 Downloads (Pure)

Abstract

In this work we assess the most recent estimates of glacial isostatic adjustment (GIA) for Antarctica, including those from both forward and inverse methods. The assessment is based on a comparison of the estimated uplift rates with a set of elastic-corrected GPS vertical velocities. These have been observed from an extensive GPS network and computed using data over the period 2009–2014. We find systematic underestimations of the observed uplift rates in both inverse and forward methods over specific regions of Antarctica characterized by low mantle viscosities and thin lithosphere, such as the northern Antarctic Peninsula and the Amundsen Sea Embayment, where its recent ice discharge history is likely to be playing a role in current GIA. Uplift estimates for regions where many GIA models have traditionally placed their uplift maxima, such as the margins of Filchner-Ronne and Ross ice shelves, are found to be overestimated. GIA estimates show large variability over the interior of East Antarctica which results in increased uncertainties on the ice-sheet mass balance derived from gravimetry methods.
Original languageEnglish
Pages (from-to)6947-6965
Number of pages19
JournalJournal of Geophysical Research: Solid Earth
Volume121
Issue number9
Early online date29 Sep 2016
DOIs
Publication statusPublished - Sep 2016

Keywords

  • Glacial-isostatic adjustment
  • Antarctica

Fingerprint

Dive into the research topics of 'An assessment of forward and inverse GIA solutions for Antarctica'. Together they form a unique fingerprint.

Cite this