Sea level could double by 2100, as previously estimated from climate change according to a new NASA study
According to the findings in the journal Proceedings of the National Academy of Sciences sea-level rise in the next 80 years may rise by as much as 65 centimenteres, enough to cause significant problems coastal cities, Space.com reported March 2
"This is almost certainly a conservative estimate," said Steve Nerem, a professor at the University of Colorado-Boulder who led NASA's sea-level change (1
The results are based on 25 years of NASA and European satellite data
"Our extrapolation assumes that sea levels will continue to change over the last 25 years in the future, given the huge changes we are seeing in the ice sheets today This is unlikely to happen, "Nerem said in a statement
Increasing concentrations of greenhouse gases in the Earth's atmosphere increase the temperature of air and water, raising sea levels in two ways.
First, warmer water expands, and this "thermal expansion" of the ocean has contributed about half of the seven centimeters. The global mean sea level rise observed in the last 25 years, said Nerem.
Second, the water from melting land ice flows into the ocean, which also increases the sea level around the world.
The rate of the sea In the 1990s, the increase has risen from about 2.5 millimeters per year to about 3.4 millimeters per year, according to the researchers.
These increases have been measured since 1992 by satellite altimeters, including TOPEX / Poseidon, Jason-1, Jason -2, and Jason-3 missions, jointly developed by NASA, the Center national d etudes spatiales, the European Organization for the use of meteorological satellites and the US Marine and Atmospheric Administration [1 9659005] The researchers say that the speed of acceleration can be influenced by geological events such as volcanic eruptions or by climate patterns such as El Nino and La Nina.
They used climate models and other datasets to explain the volcanic effects and to determine the El-Nino / La-Nina effects and finally uncover the underlying rate and acceleration of sea-level rise.