Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations - Archive ouverte HAL Access content directly
Journal Articles Surveys in Geophysics Year : 2010

Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations

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Matt A. King
  • Function : Author
Zuheir Altamimi
  • Function : Author
Johannes Boehm
  • Function : Author
Machiel Bos
  • Function : Author
Rolf Dach
  • Function : Author
Pedro Elosegui
  • Function : Author
Manuel Hernández-Pajares
  • Function : Author
David Lavallee
  • Function : Author
Paulo Jorge Mendes Cerveira
  • Function : Author
Nigel Penna
  • Function : Author
Riccardo E. M. Riva
  • Function : Author
Peter Steigenberger
  • Function : Author
Tonie van Dam
  • Function : Author
Luca Vittuari
  • Function : Author
Simon Williams
  • Function : Author

Abstract

The provision of accurate models of Glacial Isostatic Adjustment (GIA) is presently a priority need in climate studies, largely due to the potential of the Gravity Recovery and Climate Experiment (GRACE) data to be used to determine accurate and continent-wide assessments of ice mass change and hydrology. However, modelled GIA is uncertain due to insufficient constraints on our knowledge of past glacial changes and to large simplifications in the underlying Earth models. Consequently, we show differences between models that exceed several mm/year in terms of surface displacement for the two major ice sheets: Greenland and Antarctica. Geodetic measurements of surface displacement offer the potential for new constraints to be made on GIA models, especially when they are used to improve structural features of the Earth’s interior as to allow for a more realistic reconstruction of the glaciation history. We present the distribution of presently available campaign and continuous geodetic measurements in Greenland and Antarctica and summarise surface velocities published to date, showing substantial disagreement between techniques and GIA models alike. We review the current state-of-the-art in ground-based geodesy (GPS, VLBI, DORIS, SLR) in determining accurate and precise surface velocities. In particular, we focus on known areas of need in GPS observation level models and the terrestrial reference frame in order to advance geodetic observation precision/accuracy toward 0.1 mm/year and therefore further constrain models of GIA and subsequent present-day ice mass change estimates.
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Dates and versions

insu-03605285 , version 1 (11-03-2022)

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Attribution - CC BY 4.0

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Matt A. King, Zuheir Altamimi, Johannes Boehm, Machiel Bos, Rolf Dach, et al.. Improved Constraints on Models of Glacial Isostatic Adjustment: A Review of the Contribution of Ground-Based Geodetic Observations. Surveys in Geophysics, 2010, 31 (5), pp.465-507. ⟨10.1007/s10712-010-9100-4⟩. ⟨insu-03605285⟩
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