One year with unusual erosion proves a trend.
2009 winter coastal erosion linked to climate change
By SUZANNE BOHAN
Oakland Tribune
Posted: 07/18/2011 01:43:09 AM PDT
Updated: 07/18/2011 01:43:10 AM PDT
The storms that battered the West Coast during the winter of 2009-10 eroded record chunks of shoreline, and more will likely disappear as the changing climate brings more such powerful storm seasons, scientists warn in a new study.
Pacific waves were 20 percent stronger on average than any year since 1997 and higher-than-usual sea levels drove them further inland, tearing away on average one-third m ore land in California.
The state’s beaches were “eroded to often unprecedented levels,” said Patrick Barnard, a coastal geologist with the U.S. Geological Survey who led the research.
“It’s the kind of winter we may experience more frequently” as global temperatures rise, he said.
He acknowledged that the study encompassed five to 13 years of data, depending upon the beach. The researchers studied sections of the coastline, using GPS, buoys and airborne laser mapping between Seattle and San Diego.
But given what he called a startling lack of coastline studies, Barnard said the data they gathered “is the best we have. There’s nothing like it, and it covers a really broad area.”
Barnard was the lead author of the study, published by the American Geophysical Union on July 9 in Geophysical Research Letters. Researchers with five other institutions participated.
With little more than a decade of data, “we couldn’t unequivocally” say this portends the future, he said.
“But there’s no indication that there’s a light at the end of the tunnel anytime soon, given the current trends that we’re observing.”
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