Thursday, 22 February, 2018

Sea levels to be 2 feet higher by end of this century

Melting NASA reports New Study shows Global Sea Level Rise has Accelerated over past 25 years
Velma Reese | 15 February, 2018, 18:09

But according to a new analysis of satellite data collected over the past 25 years and published this week in the Proceedings of the National Academy of Sciences, that rate is increasing by almost a tenth of a millimeter per year - meaning that by the turn of the next century, the ocean could be continuing to rise at more than three times its current rate.

However, the team suspected these estimates could double, saying: "The observed acceleration will more than double the amount of sea-level rise by 2100 compared with the current rate of sea-level rise continuing unchanged", the study read.

"And this is nearly certainly a conservative estimate", Nerem added. This could mean a yearly rate of sea level rise of 10 mm/year, or even more, by 2100.

"We are already seeing signs of ice sheet instability in Greenland and Antarctica, so if they experience rapid changes, then we would likely see more than 65 centimeters of sea level rise by 2100".

However, prevailing conditions such as global warming, greenhouse gases emission, and melting ice sheets can cause the sea level rise to increase at faster rate. The greatest uncertainty is just how quickly the massive West Antarctic ice sheet will melt.

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"For a long time, people had been saying that the satellite data is too short for us to use and make any projections".

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These so-called eyes on the Earth revealed that sea level rise is not steadily rising at 0.1 inch every year, but rather, that increase is increasing, itself-by 0.003 inches each year.

Ultimately, the research is important because it provides a data-driven assessment of how sea level has been changing, and this assessment largely agrees with projections using independent methods.

Climate change can lead to rising seas in two ways. - file picMIAMI, Feb 13 - Sea level rise is accelerating and could reach 26 inches (66 centimetres) by century's end, in line with United Nations estimates and enough to cause significant problems for coastal cities, a study said yesterday.

Sea levels are rising at an accelerated pace, according to a paper published Monday in the journal Proceedings of the National Academy of Sciences.

The warming of oceans and the melting of ice sheet and glaciers, particularly in Antarctica and Greenland, have contributed to the hastening sea level rise. Second, melting land ice flows into the ocean, also increasing sea level across the globe.

"It's a small signal and yet, over 100 years, small signals add up to a lot", Steve Nerem, a University of Colorado, Boulder aerospace engineering professor and fellow at the Cooperative Institute for Research in Environmental Sciences, said in an interview with Seeker. "It also demonstrates the importance of climate models in interpreting satellite records, such as in our work where they allow us to estimate the background effects of the 1991 eruption of Mount Pinatubo on global sea level", said Fasullo.

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