For the first time, researchers were able to obtain data from the subsoil of Thwaites Glacier, which is also known as Doomsday GlacierAnd found that the hot water supply below is Bigger than previously thoughtThis has increased people’s concerns about the speed of melting and the acceleration of ice flow.
These findings were published in the journal Scientific progress,possible Thanks to Submarine RanThey were unmanned, marching in front of Thwaites Glacier.
Professor Karen Heywood from the University of East Anglia in the UK explained: “This is Ran’s first entry into the polar regions. Its exploration of the waters under the ice shelf has been much more successful than expected.” “We plan to pass. new task Next year,” he announced.
Other indicators that have been measured by the submersible include: Force, temperature, salinity and oxygen content The ocean current flowing under the glacier.
Anna Wahlin, a professor of oceanography at the University of Gothenburg in Sweden, said that global sea levels are affected by the amount of land ice, and the biggest uncertainty in forecasts is the future evolution of the West Antarctic ice sheet. New research.
The West Antarctic Ice Sheet is responsible 10% of the current sea level rise rate And it is also the country most likely to increase this rate, because the fastest changing in the world is the Thwaites Glacier.
Because of its location and shape, Thwaites is Especially sensitive to warm and salty ocean currents Go forward under him. This process will cause the melting of the bottom of the glacier to accelerate and move to the inside of the so-called stranded zone. The so-called stranded zone is an area where frozen water changes from resting on the seabed to floating in the ocean.
Due to its inconvenient location, far away from the research station, in areas usually blocked by thick sea ice and many icebergs, The scarcity of field measurements in the area. This means that there is a large gap in process knowledge in the region.
This result provides the first measurement under the Thwaites Glacier, which has been used Map ocean currents Below the floating part. The researchers found that there is a deep connection with the east, where the current of Songdo Bay passes through the east, where it was previously thought to be a confluence blocked by an underwater ridge.
The research team also measured Heat transfer One of the three channels that lead hot water from the north to the Thwaites Glacier is still unknown.
“Using the sonar on the ship and nesting it with the super high resolution ocean map, we can find Different paths of water in and out The ice shelf cavity influenced by the geometry of the seabed” explained Dr. Alastair Graham of the University of South Florida.
Although the amount of ice melted by hot water is not much compared with other global fresh water sources, heat transfer has a significant impact. Good local effect This may indicate that the glacier is unstable over time.
Researchers also observed large amounts of meltwater flowing north and away from the front of the glacier.
Changes in salinity, temperature and oxygen content indicate that the area under the glacier is Hitherto unknown activity area Different waters converge and mix together, which is very important for understanding the melting process of the ice bottom.
Warin said that this is “good news,” and this is the first time they have collected the necessary data to characterize the dynamics of the Tweet Glacier. “These data will help us better estimate deicing in the future. With new technology, we will be able to improve the model and Reduce great uncertainty He celebrated: “It now exists around global sea level changes.”