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Improved constraints on models of glacial isostatic adjustment: a review of the contribution of ground-based geodetic observations

King, M. A.; Altamimi, Z.; Boehm, J.; Bos, M.; Dach, R.; Elosegui, P.; Fund, F.; Hernandez-Pajares, M.; Lavallee, D.; Cerveira, P. J. M.; Penna, N.; Riva, R. E. M.; Steigenberger, P.; van Dam, T.; Vittuari, L.; Williams, S.; Willis, P.. 2010 Improved constraints on models of glacial isostatic adjustment: a review of the contribution of ground-based geodetic observations. Surveys in Geophysics, 31 (5). 465-507. 10.1007/s10712-010-9100-4

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Abstract/Summary

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

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1007/s10712-010-9100-4
Programmes: Oceans 2025 > Climate, ocean circulation and sea level
ISSN: 0169-3298
Additional Information. Not used in RCUK Gateway to Research.: King, Matt A. Altamimi, Zuheir Boehm, Johannes Bos, Machiel Dach, Rolf Elosegui, Pedro Fund, Francois Hernandez-Pajares, Manuel Lavallee, David Cerveira, Paulo Jorge Mendes Penna, Nigel Riva, Riccardo E. M. Steigenberger, Peter van Dam, Tonie Vittuari, Luca Williams, Simon Willis, Pascal Cost [es0701]; rcuk This work was partially funded by COST Action ES0701. This is IPGP contribution 2629. We thank Volker Klemann and Wouter van der Wal for providing the model data used to produce Figs. 1 and 2. Matt King was part funded by a RCUK Academic Fellowship. Springer Dordrecht
Additional Keywords: GLACIAL ISOSTATIC ADUSTMENT; ICE SHEET MASS BALANCE; GEODESY; ANTARCTICA; GREENLAND; GPS; VERY LONG BASELINE INTERFEROMETRY; DORIS; SEA LEVEL RISE; POSTGLACIAL SEA LEVEL; PHSE CENTRE VARIATIONS; COORDINATE TIME SERIES; ICE; SATELLITES; SOLID EARTH; LOADING DISPLACEMENT; LATE PLEISTOCENE; REFERENCE FRAMES
NORA Subject Terms: Earth Sciences
Date made live: 22 Mar 2011 10:56
URI: http://nora.nerc.ac.uk/id/eprint/13774

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