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Thiéblemont, Rémi, Le Cozannet, Gonéri, Nicholls, Robert J. 
ORCID: https://orcid.org/0000-0002-9715-1109, Rohmer, Jérémy, Wöppelmann, Guy, Raucoules, Daniel, de Michele, Marcello, Toimil, Alexandra and Lincke, Daniel
(2024)
Assessing current coastal subsidence at continental scale: Insights from Europe using the European Ground Motion Service.
Earth's Future, 12 (8).
ISSN 2328-4277
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Abstract
Beside climate-change-induced sea-level rise (SLR), land subsidence can strongly amplify coastal risk in flood-prone areas. Mapping and quantifying contemporary vertical land motion (VLM) at continental scales has long been a challenge due to the absence of gridded observational products covering these large domains. Here, we fill this gap by using the new European Ground Motion Service (EGMS) to assess the current state of coastal VLM in Europe. First, we compare the InSAR-based EGMS Ortho (Level 3) with nearby global navigation satellite systems (GNSS) vertical velocity estimates and show that the geodetic reference frame used to calibrate EGMS strongly influences coastal vertical land velocity estimates at the millimeter per year level and this needs to be considered with caution. After adjusting the EGMS vertical velocity estimates to a more updated and accurate International Terrestrial Reference Frame (ITRF2014), we performed an assessment of VLM in European low elevation coastal flood plains (CFPs). We find that nearly half of the European CFP area is, on average, subsiding at a rate faster than 1 mm/yr. More importantly, we find that urban areas and populations located in the CFP experience a near −1 mm/yr VLM on average (excluding the uplifting Fennoscandia region). For harbors, the average VLM is even larger and increases to −1.5 mm/yr on average. This demonstrates the widespread importance of continental-scale assessments based on InSAR and GNSS to better identify areas at higher risk from relative SLR due to coastal subsidence.
| Item Type: | Article |
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| Additional Information: | Data Availability Statement: EGMS Ortho products first release (2015–2021) is obtained from European Environment Agency (2023). The ULR-repro3 GNSS products are available from Gravelle et al. (2022). The GNSS NGL14 solution (Blewitt et al., 2018) used in this study is distributed by SONEL at the landing page (https://www.sonel.org/-Vertical-land-movements-.html?lang=en#id498). EUREF EPN D2150 densification GNSS solution was obtained from EUREF (https://epnd.sgo-penc.hu/downloads/). The results from the GIA model were downloaded from Frederikse, Caron, and Landerer (2019). CORINE Land Cover raster is obtained from CLC raster is obtained from European Environment Agency (2020). European population gridded data set from 2021 is obtained from Eurostat (2023). The Copernicus Global Digital Elevation Model at 30-m resolution used to define European coastal flood plains from European Space Agency, Sinergise (2021). Vertical land motion estimates in European coastal flood plains are provided in Thiéblemont (2024). Funding information: Horizon 2020 Framework Programme. Grant Number: 101003598; HORIZON EUROPE European Research Council. Grant Number: 101075609 |
| Uncontrolled Keywords: | egms,flooding,sea level rise,subsidence,vertical land motion,environmental science(all),earth and planetary sciences (miscellaneous),sdg 13 - climate action ,/dk/atira/pure/subjectarea/asjc/2300 |
| UEA Research Groups: | University of East Anglia Schools > Faculty of Science > Tyndall Centre for Climate Change Research Faculty of Science > Research Centres > Tyndall Centre for Climate Change Research |
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| Depositing User: | LivePure Connector |
| Date Deposited: | 29 Aug 2024 11:30 |
| Last Modified: | 01 Oct 2024 01:57 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/96390 |
| DOI: | 10.1029/2024EF004523 |
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