Scientists have found microplastics — plastic pieces smaller than a grain of rice — in freshly fallen Antarctic snow for the first time, which they said has the potential to influence the climate by accelerating melting of ice.
The findings, published recently in The Cryosphere journal, brought to light a serious threat to the Antarctic region.
Previous studies have found that microplastics have negative impacts on the health of the environment, limiting growth, reproduction, and general biological functions in organisms, as well as negative implications for humans.
In late 2019, Alex Aves, a PhD student at the University of Canterbury in New Zealand collected snow samples from the Ross Ice Shelf in Antarctica.
“When Alex travelled to Antarctica in 2019, we were optimistic that she wouldn’t find any microplastics in such a pristine and remote location,” said Laura Revell, Associate Professor at the University of Canterbury.
Once back in the lab, the researchers found that there were plastic particles in every sample from the remote sites on the Ross Ice Shelf too, and that the findings would be of global significance.
“It is incredibly sad but finding microplastics in fresh Antarctic snow highlights the extent of plastic pollution into even the most remote regions of the world,” Ms. Aves said.
“We collected snow samples from 19 sites across the Ross Island region of Antarctica and found microplastics in all of these,” she added.
The researchers found an average of 29 microplastic particles per litre of melted snow, which is higher than marine concentrations reported previously from the surrounding Ross Sea and in Antarctic sea ice.
Atmospheric modelling suggested microplastics may have travelled thousands of kilometres through the air, however it is likely that the presence of humans in Antarctica has established a microplastic ‘footprint’, the researchers said.