Exploring permafrost coastal erosion in the Arctic

Exploring permafrost coastal erosion in the Arctic
Sandbags lining the coast, which is currently Barrow’s only defense against coastal erosion. Credit: Penn State

The remote town of Barrow, Alaska, home to more than 4,000 people, touts picturesque views of the Arctic Ocean as well as an unparalleled connection to the Alaskan wild, but underneath its stunning beauty lies a major global crisis—permafrost coastal erosion—causing Barrow to gradually slip into the sea.

The Arctic is warming twice as fast as the rest of the planet, causing ice to melt and sea levels to rise, according to "Snow, Water, Ice and Permafrost in the Arctic (SWIPA)," an update to the Arctic Climate Impact Assessment. This rise is threatening the entire town of Barrow as well as the surrounding communities. In fact, it has gotten so bad that former North Slope Borough Mayor Edward Itta called Barrow "ground zero for climate-change science."

But all may not be lost, thanks to research funded by a four-year National Science Foundation grant and led by Ming Xiao, associate professor in civil engineering at Penn State.

"We know that permafrost is happening and the effects it's having on the towns and ," said Xiao. "And a solution is imminently needed."

In order to come up with viable solutions, Xiao and his collaborators are looking at the problem systematically. This project aims to bring scientists and researchers from many disciplines together to figure out exactly what the challenges are and identify possible solutions through a series of international workshops, convergent research collaborations and direct interaction with local media.

Exploring permafrost coastal erosion in the Arctic
Image of the Arctic coastline. Credit: PENN STATE

The first segment of the research occurred in Alaska recently. Xiao joined 25 other researchers whose expertise was in and natural science disciplines, including coastal geophysics, soil physics, climate modelling, atmospheric science, demography and ecology, as well as disciplines in civil and environmental engineering, for a two-day workshop in Fairbanks. The experts gave presentations and held in-depth brainstorming sessions in order to gain a better understanding of the issues at hand. Then, eight experts, including Xiao, went to Barrow to visit the coastal areas that are in danger.

In total, there are 31 Alaskan villages that face an imminent threat from permafrost coastal and will require eventual relocation.

"In some places the erosion was as much as 80 meters a year," said Xiao, citing recent studies. "That means 80 meters of land permanently lost to the sea. Since many villages are located by the coast, there are homes in the towns that are being threatened, and some houses are literally collapsing into sea."

The cost, including infrastructure, to move and relocate the people is estimated in the billions, Xiao said, and will cause fundamental disruption to the Iñupiat people's lifestyle, which has sustained for more than a thousand years. These communities' livelihood depends on fishing, regularly harvesting walrus, seal, whale and fish for food.

Exploring permafrost coastal erosion in the Arctic
Homes along the Arctic Ocean in Barrow, Alaska. Credit: Andrei/ Wikimedia Commons

Currently, the town's only defenses against coastal erosion are sandbags and gravel.

"Millions of dollars have been spent in Barrow alone to reduce the coastal erosion," said Xiao. "The sea ice can easily destroy all the erosion control. … This is a losing battle."

Though the investigation is still in the early stages, Xiao hopes that eventually the results will provide possible solutions for the town and surrounding areas.

"Permafrost coastal erosion has been studied for decades, but they've been studied in a siloed way," said Xiao. "Some study the ocean sea rise, some study the permafrost, some study the birds, some study the social issues, but this is a systematic problem. People need to come together to talk about it."


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Citation: Exploring permafrost coastal erosion in the Arctic (2019, February 5) retrieved 22 April 2019 from https://phys.org/news/2019-02-exploring-permafrost-coastal-erosion-arctic.html
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