Global sea level change in the past century
Study results derived from global tide gauge data indicate that the global waters were simultaneously subject to the modulation of lunar nodal tide showing a period of 18.6 years and rose at a rate of about 2 mm per year in the past century. In contrast to other regions, those sitting along the east Atlantic Ocean coastal lines show strong semi-diurnal pattern and seemly do not suffer from extraordinary sea level rise problems. Without considering possibilities from local climatic and geological uplift or subsidence problems, the most severe sea level rise phenomenon of 13.24 mm per year happened at Manila, Philippines, a considerable contrast with the most extreme sea level falling rate of 10.11 mm/year at Churchill in Canada. From this study, we are not only able to identify the sea level rise rate for every gauge station from the global data but also be able to predict the timing of the next peak sea level of the 18.6-year tide, which is predicted in June 2025.