Single spectrum analysis for monthly sea level data from Varna tide gauge station

Climate changes and global warming are assumed for main reasons of constant sea level rise. Survey methods such as altimetric measurements are essential for determining global processes related to sea level change, but the regional and local changes are also important. In this paper regional sea level changes at tide gauge station Varna at Black sea coast is analyzed. Single spectrum analysis is carried out for monthly sea level data for period 1929–2019. The sea level trend, long term tidal constituents, amplitudes and phases are estimated. The results clearly indicates positive mean sea level trend with value of 1.2 ±0.1mm/yr.