Toggle Main Menu Toggle Search

Open Access padlockePrints

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

Lookup NU author(s): Professor Matt King, Dr David Lavallee, Dr Nigel Penna


Full text for this publication is not currently held within this repository. Alternative links are provided below where available.


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.

Publication metadata

Author(s): King MA, Altamimi Z, Boehm J, Bos M, Dach R, Elosegui P, Fund F, Hernandez-Pajares M, Lavallee D, Cerveira PJM, Penna N, Riva REM, Steigenberger P, van Dam T, Vittuari L, Williams S, Willis P

Publication type: Review

Publication status: Published

Journal: Surveys in Geophysics

Year: 2010

Volume: 31

Issue: 5

Pages: 465-507

Print publication date: 01/09/2010

ISSN (print): 0169-3298

ISSN (electronic): 1573-0956


DOI: 10.1007/s10712-010-9100-4