Melted Alaska sea ice alarms coast residents, scientists
Jul 1, 2019
Northern Alaska coastal communities and climate scientists say sea ice disappeared far earlier than normal this spring and it's affecting wildlife
ANCHORAGE, Alaska — Sea ice along northern Alaska disappeared far earlier than normal this spring, alarming coastal residents who rely on wildlife and fish.
Ice melted as a result of exceptionally warm ocean temperatures, the Anchorage Daily News reported .
The early melting has been "crazy," said Janet Mitchell of Kivalina. Hunters from her family in early June traveled more than 50 miles (80 kilometers) by boat to find bearded seals on sea ice. Bearded seals in the past could be hunted just outside the village but sea ice had receded far to the north.
"We didn't know if we'd have our winter food," she said. "That was scary."
The hunters ran out of gas after harvesting eight seals and a walrus. They were able to call other residents to deliver fuel, Mitchell said.
Rick Thoman, a climatologist with the Alaska Center for Climate Assessment & Policy at the University of Alaska Fairbanks, posted on social media last week that the northern Bering and southern Chukchi seas are "baking."
Sea surface temperatures last week were as high as 9 degrees (5 Celsius) above the 1981-2010 average, reaching into the lower 60s, he said, with effects on the climate system, food web, communities and commerce. Kotzebue and Norton sounds were warmest but the heat extended far out into the ocean.
The warmth is weeks ahead of schedule and part of a "positive feedback loop" compounded by climate change. Rising ocean temperatures have led to less sea ice, which leads to warmer ocean temperatures, he said.
The last five years have produced the warmest sea-surface temperatures on record in the region, contributing to record low sea-ice levels.
"The waters are warmer than last year at this time, and that was an extremely warm year," Thoman said.
Lisa Sheffield Guy of the Arctic Research Consortium of the United States oversees an online platform that allows Alaska Native walrus hunters to share tips on sea ice, weather and hunting. The need for reporting ended May 31 because coastal sea ice had melted.
"When we started in 2010, we would go until the last week of June," she said.
Guy is a seabird biologist who studied birds on St. Lawrence Island south of the Bering Strait. She's worried that warmer temperatures will make it harder for seabirds to find the tiny seafood they eat, she said. The heat might push their prey deeper or away from the area.
Warmer ocean temperatures come as hunters report large numbers of dead seals off Alaska's western and northern coasts, Thoman said. An unusually large number of dead gray whales have also been found off Alaska's southern coasts, where sea surface temperatures are also unusually high, Thoman said. It's not known whether the warm water has contributed, Thoman said.
"Certainly it's all happening at the same time," he said.
In March, the high temperatures were blamed for a large ice shelf breaking from the coast near Nome in March, dragging tethered crab pots. Nick Treinen lost two crab pots and others lost more.
"It was unprecedented for March," he said.
The ice also swept away gold mining equipment, forcing a helicopter rescue for three miners who unsuccessfully tried to save it.
The National Oceanic and Atmospheric Administration will conduct an unusually extensive fish survey in the Bering Strait this summer, Thoman said. It could provide clues for possible impacts to Bering Sea fisheries, he said.
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