Between 2005 and 2007, Arctic sea ice changed its structure and thinned. Reported by TASS with reference to an article published in Nature.
The circumpolar regions are the first to suffer from global warming, which poses a serious threat to the polar permafrost and ice cover. The Arctic and Antarctic ice field is constantly shrinking, and therefore they are constantly monitored by satellites of NASA and other space agencies.
Hiroshi Sumata and colleagues discovered that the rapid contraction of a glacier can significantly affect its structure. This was found in the example of the Fram Strait, which separates Svalbard from Greenland.
At the bottom of this strait are many deep water buoys that constantly monitor the thickness, structure, speed of movement and other characteristics of the ice floating or on them. Sumata and her colleagues obtained data collected by dozens of such observing instruments between 1990 and 2019 while observing the state of ice in the Fram Strait. The scientists’ analysis of this information showed that the multi-year ice structure in the Arctic changed significantly in 2007. Before that, deformed ice with a thickness of 3-4 m prevailed in the Arctic Ocean, and after that, ice with a thickness of about 1-1.5 m began to dominate. Similarly, the average lifespan of ice changed dramatically – from 4.3 to 2.7 years.
The cause of the observed phenomenon was the anomalous “temperature” in the Arctic in the summer of 2005 and 2007. This forced melting ice off the coasts of Siberia and Alaska, opening the way for warm water to the Arctic Ocean. As a result, perennial ice becomes thinner and their lifespan shortens.
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