Print Email Facebook Twitter Constraint of glacial isostatic adjustment in the North Sea with geological relative sea level and GNSS vertical land motion data Title Constraint of glacial isostatic adjustment in the North Sea with geological relative sea level and GNSS vertical land motion data Author Simon, K.M. (TU Delft Physical and Space Geodesy; NIOZ Royal Netherlands Institute for Sea Research) Riva, R.E.M. (TU Delft Physical and Space Geodesy) Vermeersen, L.L.A. (TU Delft Physical and Space Geodesy; TU Delft Astrodynamics & Space Missions; NIOZ Royal Netherlands Institute for Sea Research) Date 2021 Abstract 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. Subject Europeloading of the Earthsatellite geodesysea level change To reference this document use: http://resolver.tudelft.nl/uuid:69e3251b-e71c-4937-a8e0-c87c61a2823b DOI https://doi.org/10.1093/gji/ggab261 ISSN 0956-540X Source Geophysical Journal International, 227 (2), 1168-1180 Part of collection Institutional Repository Document type journal article Rights © 2021 K.M. Simon, R.E.M. Riva, L.L.A. Vermeersen Files PDF ggab261.pdf 3.24 MB Close viewer /islandora/object/uuid:69e3251b-e71c-4937-a8e0-c87c61a2823b/datastream/OBJ/view