A dangerous iceberg drift close to the Antarctic penguin population in 2020 and 2021 has released billions of tons of freshwater into the ocean during disintegration.
A new study, based on satellite data, tracks the aftermath of the once mighty iceberg A-68a, once considered the The world’s largest iceberg over three years ago broken into a dozen pieces. (NASA’s Earth Observatory was once dubbed the various little bridges.”alphabet soup. “)
For a while, there was concern the ice sheet could threaten a penguin-infested island called South Georgia, located about 940 miles (1,500 km) northeast of the Antarctic peninsula. Happily, that never happened, but new research shows that icebergs inundate fresh water in the region, potentially affecting local ecosystems and providing yet another example of the effects. effects of global warming on the oceans.
The study referenced data collected by missions including Sentinel-1 (operated by the European Space Agency, or ESA), Sentinel-3 (ESA), CryoSat-2 (ESA) and ICESat- 2 (NASA), as well as the Spectrophotometer Medium Resolution Image, or MODIS, which flies aboard two of NASA’s satellites, Aqua and Terra.
Satellite data shows that during the three-month melting phase of the iceberg in late 2020 and early 2021, the old A-68a dumped into the ocean about 162 billion tons (152 billion tons) of freshwater – the equivalent of 61 million Olympic sizes. swimming pool, according to a Press Release from the UK, who participated in the University of Leeds study.
“Berg melted enough as it drifted to avoid damaging the seafloor around South Georgia by running aground,” the university said. “One side effect of the melting, however, is the release of a whopping 152 billion tons of freshwater near the island – a disturbance that could profoundly affect the island’s marine habitat.”
Fresh water and nutrients tend to flow from the melting ice sheets. The university notes that freshwater flooding alters ocean circulation and ocean ecosystems near the glacier.
“The next thing we wanted to find out was whether it had a positive or negative impact on the ecosystem around South Georgia,” said lead author and Leeds PhD. candidate Anne Braakmann-Folgmann said in the same statement.
She noted that the iceberg crosses a common ocean “highway” known as the Drake Passage, so the fate of A68-A could help understand how icebergs in that area affect the ocean at large. how.
ONE research based on research published in the March 1 issue of Environmental Remote Sensing.
https://www.space.com/shattered-iceberg-fresh-water-ocean Iceberg ‘alphabet soup’ pours a lot of fresh water into the ocean