The geocentric sea-level rise in the Hellenic area: The synergy of tide-gauges measurements and collocated GNSS stations
21/09/2016 | 17:00 | Session 5: Height systems and vertical datum unification
Author(s): Stylianos Bitharis, Dimitrios Ampatzidis, Christos Pikridas, Aristeidis Fotiou and Harald Schuh
Stylianos Bitharis, Dimitrios Ampatzidis, Christos Pikridas, Aristeidis Fotiou and Harald Schuh
In the present study, we show for the first time the geocentric sea level rise of totally 12 sites located at the Hellenic area. The geocentric sea level rise is estimated by taking into account the Tide Gauges measurements and the collocated GNSS stations of the Hellenic Permanent GNSS Network (HPNet). Tide gauges measure the height of the water relative to a monitored geodetic benchmark on land, on the other hand GNSS measure the vertical land motion. Various error sources related to tide gauges (e.g. equipment changes, random noise) affected the estimation of the sea level rise. In order to reduce outlier effects, we apply robust regression analysis in the mean sea level time series. The GNSS time series obtained from seven years continuously data analysis, with extended models includes periodic signals. The sea level-trends obtained from the tide gauges and corrected with the GNSS vertical velocity from collocated sites, which expressed in the recent International Terrestrial Reference Frame 2014 (ITRF).