Fastest sea-level rise in 2 millennia linked to increasing global temperatures

Posted By News On June 20, 2011 - 9:00pm
Fastest sea-level rise in 2 millennia linked to increasing global temperatures

The rate of sea level rise along the U.S. Atlantic coast is greater now than at any time in the past 2,000 years--and has shown a consistent link between changes in global mean surface temperature and sea level.

The findings are published this week in the journal Proceedings of the National Academy of Sciences (PNAS).

The research, funded by the National Science Foundation (NSF), was conducted by Andrew Kemp, Yale University; Benjamin Horton, University of Pennsylvania; Jeffrey Donnelly, Woods Hole Oceanographic Institution; Michael Mann, Pennsylvania State University; Martin Vermeer, Aalto University School of Engineering, Finland; and Stefan Rahmstorf, Potsdam Institute for Climate Impact Research, Germany.

"Having a detailed picture of rates of sea level change over the past two millennia provides an important context for understanding current and potential future changes," says Paul Cutler, program director in NSF's Division of Earth Sciences.

"It's especially valuable for anticipating the evolution of coastal systems," he says, "in which more than half the world's population now lives."

Rising seas lap at the house in "Nights in Rodanthe," filmed during the field work.

(Photo Credit: Andrew Kemp, Yale University)

Adds Kemp, "Scenarios of future rise are dependent on understanding the response of sea level to climate changes. Accurate estimates of past sea-level variability provide a context for such projections."

Kemp and colleagues developed the first continuous sea-level reconstruction for the past 2,000 years, and compared variations in global temperature to changes in sea level over that time period.

The team found that sea level was relatively stable from 200 BC to 1,000 AD.

Then in the 11th century, sea level rose by about half a millimeter each year for 400 years, linked with a warm climate period known as the Medieval Climate Anomaly.

Then there was a second period of stable sea level during a cooler period called the Little Ice Age. It persisted until the late 19th century.

Since the late 19th century, sea level has risen by more than 2 millimeters per year on average, the steepest rate for more than 2,100 years.

"Sea-level rise is a potentially disastrous outcome of climate change," says Horton, "as rising temperatures melt land-based ice, and warm ocean waters."

This is an expanse of salt marsh near Trump Point, N.C.; how long will its grasses remain above water?

(Photo Credit: Andrew Kemp, Yale University)

To reconstruct sea level, the scientists used microfossils called foraminifera preserved in sediment cores extracted from coastal salt marshes in North Carolina. The age of the cores was estimated using radiocarbon dating and other techniques.

To test the validity of their approach, the team compared its reconstructions with tide-gauge measurements from North Carolina for the past 80 years, and global tide-gauge records for the past 300 years.

A second reconstruction from Massachusetts confirmed their findings.

The records were corrected for contributions to sea-level rise made by vertical land movements.

The reconstructed changes in sea level over the past millennium are consistent with past global temperatures, the researchers say, and can be determined using a model relating the rate of sea level rise to global temperature.

"Data from the past helped calibrate our model, and will improve sea level rise projections under scenarios of future temperature increases," says Rahmstorf.

Andrew Kemp (in red) and colleague Simon Engelhart (in yellow) collect sediment cores.

(Photo Credit: Steve Culver, East Carolina University)

good to see some actual scientific research has broken the surface of the global warming tax propaganda. historically, the earth warms and cools with or without mans intervention. in the 60s it was all about global cooling. courtesy al gore and co. (green) and the nato carbon tax scam, and the dichloroflourocarbons that magically waft their way from the ground to the ozone layer (tho they are heavier than air). if youve been out of doors there is no doubt its getting hotter. more water in the air as it evaporates from the northern and southern ice(it doesnt just melt and run off in the sea) without doubt will create huge shifts in weather balance due to the heat absorbing nature of water. perhaps with empirical evidence as opposed to the cretinous political propaganda you might get someone to pay attention, and dump the tax, theres noone left able to afford the scam of the age

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