Abu Dhabi, UAEWednesday 2 December 2020

Environment

Climate change may be turning the Antarctic green

Scientists are mapping algae blooms on the frozen expanses to see why the continent's green tinge can be seen from space

Antarctica conjures images of an unbroken white wilderness, but blooms of algae are giving parts of the frozen continent an increasingly green tinge.

Warming temperatures due to climate change are helping the formation and spread of "green snow" and it is becoming so prolific in places that it is even visible from space, according to new research published on Wednesday.

While the presence of algae in Antarctica was noted by long-ago expeditions, such as the one undertaken by British explorer Ernest Shackleton, its full extent was unknown.

A handout picture taken in 2018 and released on May 19, 2020 by the University of Cambridge and Matthew Davey shows researcher Andrew Gray geo-tagging snow algae blooming on Anchorage Island, near Davis Station, Antarctica. Parts of the Antarctic Peninsula will change colour as "green snow" caused by blooming algae is expected to spread as global temperatures increase, new research showed on May 19, 2020. - RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / MATTHEW DAVEY / UNIVERSITY OF CAMBRIDGE " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS / AFP / University of Cambridge / University of Cambridge / Matthew Davey / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / MATTHEW DAVEY / UNIVERSITY OF CAMBRIDGE " - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS
Researcher Andrew Gray geo-tagging snow algae blooming on Anchorage Island, near Davis Station, Antarctica. AFP/ Matthew Davey, University of Cambridge

Now, using data collected over two years by the European Space Agency's Sentinel 2 satellite, together with on the ground observations, a research team from the University of Cambridge and the British Antarctic Survey have created the first map of the algae blooms on the Antarctic Peninsula coast.

"We now have a baseline of where the algal blooms are and we can see whether the blooms will start increasing as the models suggest in the future," Matt Davey of the University of Cambridge's Department of Plant Sciences told Reuters.

Mosses and lichens are considered the dominant photosynthetic organisms in Antarctica - but the new mapping found 1,679 separate algal blooms that are a key component in the continent's ability to capture carbon dioxide from the atmosphere.

"The algal blooms in Antarctica are equivalent to about the amount of carbon that's being omitted by 875,000 average UK petrol car journeys," Davey said. "That seems a lot but in terms of the global carbon budget, it's insignificant.

"It does take up carbon from the atmosphere but it won't make any serious dent in the amount of carbon dioxide being put in the atmosphere at the moment."

Green is not the only splash of colour in Antarctica. Researchers are now planning similar studies on red and orange algae, although that is proving harder to map from space.

Updated: May 20, 2020 05:46 PM

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