Constraint of glacial isostatic adjustment in the North Sea with geological relative sea level and GNSS vertical land motion data
- 7 July 2021
- journal article
- research article
- Published by Oxford University Press (OUP) in Geophysical Journal International
- Vol. 227 (2), 1168-1180
- https://doi.org/10.1093/gji/ggab261
Abstract
SUMMARY: In this study, we focus on improved constraint of the glacial isostatic adjustment (GIA) signal at present-day, and its role as a contributor to present-day sea level budgets. The main study area extends from the coastal regions of northwestern Europe to northern Europe. Both Holocene relative sea level (RSL) data as well as vertical land motion (VLM) data are incorporated as constraints in a semi-empirical GIA model. 71 geological rates of GIA-driven RSL change are inferred from Holocene proxy data and 108 rates of vertical land motion from GNSS provide an additional measure of regional GIA deformation. Within the study area, the geological RSL data complement the spatial gaps of the VLM data and vice versa. Both data sets are inverted in a semi-empirical GIA model to yield updated estimates of regional present-day GIA deformations. A regional validation using tide gauges is presented for the North Sea, where the GIA signal may be complicated by lateral variations in Earth structure and existing predictions of regional and global GIA models show discrepancies. The model validation in the North Sea region suggests that geological data are needed to fit independent estimates of GIA-related RSL change inferred from tide gauge rates, indicating that geological rates from Holocene data do provide an important additional constraint for data-driven approaches to GIA estimation.Funding Information
- Netherlands Organisation for Scientific Research (864.12.012, ALWGO.2017.005)
This publication has 87 references indexed in Scilit:
- The Scandinavian Ice Sheet: from MIS 4 to the end of the Last Glacial MaximumBoreas, 2010
- The high-resolution Holocene sea-level curve for Northwest Germany: global signals, local effects or data-artefacts?International Journal of Earth Sciences, 2009
- TOPO-EUROPE: The geoscience of coupled deep Earth-surface processesGlobal and Planetary Change, 2007
- REVEL: A model for Recent plate velocities from space geodesyJournal of Geophysical Research, 2002
- A review of relative sea level rise caused by mining-induced subsidence in the coastal zone: some implications for increased coastal recessionClimate Research, 2001
- Geological causes of recent (∼100 yr) vertical land movement in the NetherlandsTectonophysics, 1998
- Late Pleistocene and Holocene sea-level change along the Australian coastPalaeogeography, Palaeoclimatology, Palaeoecology, 1990
- Subduction and tectonics on the continental margin off northern SpainMarine Geology, 1979
- Glacial-Isostatic Adjustment-I. The Forward ProblemGeophysical Journal of the Royal Astronomical Society, 1976
- Past Sea Levels, Eustasy and Deformation of the EarthQuaternary Research, 1972