World Ocean Rises Record Over 3,000 Years

World Ocean Level and Average Planet Temperature

Environmentalists from Rutgers University (New Jersey, USA) collected a large database of World Ocean levels from various sources, and, using statistical analysis, found that the current rise in water level is unprecedented in the history of observations. Both the water level and its growth rate exceed the figures from previous observations.

A significant increase in the level, which began in the 19th century and developed in the 20th, with a statistical probability of more than 95%, is faster than in the previous 27 centuries. In total in the 20th century, the level rose by 14 cm, although extrapolation of historical information suggests that the level should have changed no more than 7 cm.

The usual fluctuations throughout history were of the order of ± 8 cm. From 0 to 700, growth was observed, and in the period from 1000 to 1400, there was a decrease in the level together with global cooling. These data are consistent with the average temperature data collected by other researchers.

For the study, data from sources around the world were first compiled, and as a result, a base appeared reflecting global trends, and not just local data. The data reflect a measurement of the levels of the oceans at 24 points on the globe.

Direct scientific measurements of sea level began to be carried out only in the 18th century. To determine earlier indicators, scientists use indirect data, such as the number of microorganisms in corals at certain depths. A generalization of such data makes it possible to smooth out errors and reveal the big picture.

Extrapolation of the current picture allowed scientists to assume that without a significant restriction of greenhouse gas emissions, by 2100 we will be able to see an increase in the level of the World Ocean by 50-130 cm. If we seriously engage in limiting emissions, the increase may be limited to 25-60 cm.