Coastal Subsidence in Europe Derived from the European Ground Motion Service. Consequences for Local Sea Level Rise

We present an analysis of coastal subsidence in Europe based on the recent European Ground Motion Service (EGMS) product. First, we compare EGMS products with vertical land velocities from the permanent Global Navigation Satellite System (GNSS) network. Overall, we find a reasonable agreement with a correlation coefficient of 0.94 between the vertical velocities estimates from GNSS stations and the collocated EGMS pixels. However, we obtain systematically more negative values (of up to 1 mm/yr) from EGMS estimates. These deviations could be related to the different reference frame used to calibrate EGMS (ETRF2000) and GNSS (IGS2014). Second, we combine coastal flood plain defined from the new Copernicus digital elevation model (25m resolution) and the EGMS estimates to identify subsiding coastal flood plains at the scale of Europe.