By YUMI NAKAYAMA/ Staff Writer
September 8, 2020 at 09:00 JST
Scientists survey the edge of the Shirase Glacier to examine how ice melts and flows into the ocean in January. This photo was taken from a helicopter. (Yumi Nakayama)
SYOWA STATION, Antarctica--Researchers say an underwater hot spot, where warm seawater runs under one of the fastest moving glaciers in Antarctica, is causing the ice to melt faster.
The new research could help determine how quickly sea levels will change around the world, which is affected by how fast glaciers melt.
A team of scientists from Japan's Hokkaido University, National Institute of Polar Research (NIPR) and Japan Agency for Marine-Earth Science and Technology (JAMSTEC), as well as the British Antarctic Survey, studied the Shirase Glacier near Japan's Syowa Station base.
Others have recently identified accelerated ice sheet melting in the western part of Antarctica. But glaciers on the eastern side, including the Shirase Glacier, have not been well studied and many details, including melt rates, are unknown.
"Figuring out ice sheet melting mechanisms on Antarctica will prove useful in estimating the future sea level changes on Earth," said Takeshi Tamura, an associate professor of environmental science at the NIPR.
Tamura took part in the first full-scale research project in the area around the Totten Glacier in East Antarctica, where an ice-sheet melting mechanism similar to the Shirase Glacier appears to be at work, beginning last year through this year as a member of the 61st Japanese Antarctic expedition.
Between January and February 2017, the 58th expedition sailed close enough to the Shirase Glacier to become the first Japanese expeditionary party to measure the water temperature, salinity, dissolved oxygen level and other factors at 31 points in waters in front of the glacier.
The results showed warmer seawater off the coast is flowing under the stretched end of the glacier, speeding up how fast the ice is melting from the bottom up.
The team's findings were published in the online edition of the British scientific journal Nature Communications on Aug. 24.
Antarctica’s ice is estimated to account for 90 percent of all the frozen water that exists on Earth.
If all the ice melts there, the sea level would rise 60 meters across the planet, research suggests.
If glacier edges melt, ice on Antarctica will flow into the ocean more easily, resulting in much higher sea levels.
Asahi Shimbun Staff Writer Yumi Nakayama is accompanying the expedition as a member of the wintering party. The veteran polar reporter accompanied the 45th and 51st Japanese Antarctic expedition and has been to the Arctic seven times.
The Asahi Shimbun aims “to achieve gender equality and empower all women and girls” through its Gender Equality Declaration.
Let’s explore the Japanese capital from the viewpoint of wheelchair users and people with disabilities with Barry Joshua Grisdale.
This special page portrays the dramatic arrest of Carlos Ghosn and the twists and turns that followed.
This special page reviews what the former Nissan Motor Co. chairman left during his 19 years in Japan.
Baseball star Ichiro Suzuki had much to say on March 21, 2019, the day he hung up his spikes.
This special page details how journalists uncovered shady transactions through Bermuda and other tax havens.