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Maine and Nova Scotia Coastlines Show Evidence Of Rising Seas

Sea level rise in Nova Scotia (60 cm since 1750) and eastern Maine (50 cm since 1750) has been faster than in southwestern Maine (30 cm since 1750) because of gradual sinking of the coastline. This subsidence is caused by the lingering effects of the melting of the ice sheet that covered North America during the last ice age.
by Kara LeBeau for GSA
Boulder - Nov 7, 2001
Global warming impacts various conditions on our Earth, one result being changes in sea level. Scientists have recently discovered that the sea level along the coast of Maine has risen 30-50 cm since 1750 A.D. and along the coast of Nova Scotia as much as 60 cm. They were able to go back in time, so to speak, by studying the evidence of change by using high-resolution sea-level records based on foraminiferal and chronological analyses of salt marsh peat sequences.

"This is the first time that the rise has been adequately dated and it is also the first time it has been documented and verified in three locations, several hundred miles apart," explained Roland Gehrels, from the University of Plymouth in the UK. He and his colleagues studied records from Wells and Machiasport (northern Gulf of Maine) and Chezzetcook (Atlantic coast of Nova Scotia). Their findings jibed with those recorded in tide-gauge records.

"Tide-gauge records are instrumental records of sea-level change, measured directly with an instrument, usually from a harbor pier. Along the coast of Maine these records are available for the period since 1912," Gehrels said.

"My records are geological reconstructions from salt marsh sediments. They go further back in time than the instrumental observations. The most recent part of my reconstruction, the part that covers the 20th century and thus overlaps with the instrumental record, gives the same values as the tide-gauge record.

"This is important because it is a check on the validity of the reconstruction. If they didn't match it would tell you something is wrong with the reconstruction!"

Gehrels will present these findings on Monday, November 5, at the Geological Society of America's annual meeting, A Geo-Odyssey, in Boston, Massachusetts.

Sea level rise in Nova Scotia (60 cm since 1750) and eastern Maine (50 cm since 1750) has been faster than in southwestern Maine (30 cm since 1750) because of gradual sinking of the coastline. This subsidence is caused by the lingering effects of the melting of the ice sheet that covered North America during the last ice age.

The 30-60 cm increase in sea-level rise along the coasts of Maine and Nova Scotia is unprecedented in the past millennium. Is this due to natural events or human interference? Or a combination of the two?

"There seems to be a two-stepped rise. First, sea level rose at the end of the 18th century as a result of natural climatic warming. In the 19th century, sea level didn't rise much at all. But at the beginning of the 20th century, sea level took off again, in tandem with global and hemispheric temperature rise," Gehrels explained.

"But sea level is rising faster now than during times when there was only 'natural' warming. This is a strong indication that current sea-level rise is not just the result of 'natural' warming but is, at least in part, caused by human-induced climate change."

Related Links
Abstract for this presentation
University of Plymouth
Geological Society of America
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Earth is Becoming a Greener Greenhouse
Washington - Sept. 4, 2001
Over the past 21 years, parts of the northern hemisphere have become much greener than they used to be. Researchers using satellite data have confirmed that plant life above 40 degrees north latitude (New York, Madrid, Ankara, Beijing) has been growing more vigorously since 1981.



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