Global warming implicated in half or more of oceans’ rise during 1900s
NPS Climate Change Response/Flickr
Sea levels rose faster last century than during any time since Rome was founded around 2,800 years ago. Reconstructing past rises and falls in global sea level, researchers estimate that more than half of the 13.8 centimeters of sea level rise recorded in the 1900s resulted from global warming effects, such as glacial melt. The new work will appear in the Proceedings of the National Academy of Sciences.
The researchers, led by climate scientist Robert Kopp of Rutgers University in Piscataway, N.J., analyzed measurements of ancient sea levels collected from 24 locations around the world, from New Zealand to New Jersey. The researchers calibrated the data using modern ocean tide measurements. They found that sea levels rose by about 0.1 millimeters per year from the first through the eighth centuries and fell around 0.2 millimeters per year during the 11th through 14th centuries. Sea levels rose