Climate-driven vertical acceleration of Icelandic crust measured by continuous GPS geodesy

Kathleen Compton, Richard A. Bennett, Sigrún Hreinsdõttir

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Earth's present-day response to enhanced glacial melting resulting from climate change can be measured using Global Positioning System (GPS) technology. We present data from 62 continuously operating GPS instruments in Iceland. Statistically significant upward velocity and accelerations are recorded at 27 GPS stations, predominantly located in the Central Highlands region of Iceland, where present-day thinning of the Iceland ice caps results in velocities of more than 30mm/yr and uplift accelerations of 1-2mm/yr2. We use our acceleration estimates to back calculate to a time of zero velocity, which coincides with the initiation of ice loss in Iceland from ice mass balance calculations and Arctic warming trends. We show, through a simple inversion, a direct relationship between ice mass balance measurements and vertical position and show that accelerated unloading is required to reproduce uplift observations for a simple elastic layer over viscoelastic half-space model.

Original languageEnglish (US)
Pages (from-to)743-750
Number of pages8
JournalGeophysical Research Letters
Volume42
Issue number3
DOIs
StatePublished - Feb 16 2015

Keywords

  • GPS geodesy
  • Iceland
  • climate change
  • glacial isostatic adjustment
  • uplift

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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