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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

Journal Article


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Abstract


  • The Authors. 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.

Authors


  •   Martín-Español, Alba (external author)
  •   Zammit-Mangion, Andrew
  •   Clarke, Peter J. (external author)
  •   Flament, Thomas (external author)
  •   Helm, Veit (external author)
  •   King, Matt A. (external author)
  •   Luthcke, Scott B. (external author)
  •   Petrie, Elizabeth (external author)
  •   Rémy, Frederique (external author)
  •   Schön, Nana (external author)
  •   Wouters, Bert (external author)
  •   Bamber, Jonathan (external author)

Publication Date


  • 2016

Citation


  • Martín-Español, A., Zammit-Mangion, A., Clarke, P. J., Flament, T., Helm, V., King, M. A., Luthcke, S. B., Petrie, E., Rémy, F., Schön, N., Wouters, B. & Bamber, J. L. (2016). 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), 182-200.

Scopus Eid


  • 2-s2.0-84957991561

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6428&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5400

Has Global Citation Frequency


Number Of Pages


  • 18

Start Page


  • 182

End Page


  • 200

Volume


  • 121

Issue


  • 2

Place Of Publication


  • United States

Abstract


  • The Authors. 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.

Authors


  •   Martín-Español, Alba (external author)
  •   Zammit-Mangion, Andrew
  •   Clarke, Peter J. (external author)
  •   Flament, Thomas (external author)
  •   Helm, Veit (external author)
  •   King, Matt A. (external author)
  •   Luthcke, Scott B. (external author)
  •   Petrie, Elizabeth (external author)
  •   Rémy, Frederique (external author)
  •   Schön, Nana (external author)
  •   Wouters, Bert (external author)
  •   Bamber, Jonathan (external author)

Publication Date


  • 2016

Citation


  • Martín-Español, A., Zammit-Mangion, A., Clarke, P. J., Flament, T., Helm, V., King, M. A., Luthcke, S. B., Petrie, E., Rémy, F., Schön, N., Wouters, B. & Bamber, J. L. (2016). 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), 182-200.

Scopus Eid


  • 2-s2.0-84957991561

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=6428&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/5400

Has Global Citation Frequency


Number Of Pages


  • 18

Start Page


  • 182

End Page


  • 200

Volume


  • 121

Issue


  • 2

Place Of Publication


  • United States