Green snow created by blooming algae in the Antarctic Peninsula is likely to spread as temperatures increase as a result of climate change, researchers have said, after creating the first large-scale map of the organisms and their movements.
Satellite data gathered between 2017 and 2019, combined with on-the-ground measurements over two summers in Antarctica, allowed scientists to map the microscopic algae as they bloomed across the snow of the Antarctic Peninsula.
Warming temperatures could create more “habitable” environments for the algae, which need wet snow to grow in, researchers told CNN.
Green snow alga is microscopic when measured individually, but when the organisms grow simultaneously, they turn the snow bright green, and can even be spotted from space, researchers said in a study published in the Nature Communications journal on Wednesday.
Researchers from the University of Cambridge and the British Antarctic Survey used European Space Agency satellite data with measurements from Antarctica’s Ryder Bay, Adelaide Island, the Fildes Peninsula and King George Island.
Patches of green snow algae can be found along the Antarctic coastline, usually in “warmer” areas, where average temperatures are a little above zero degrees Celsius during the Southern Hemisphere’s summer months of November to February.
The Antarctic Peninsula is the part of the region that has experienced the most rapid warming in the latter part of the last century, researchers say.
Unusually high temperatures were recorded in February, while a nine-day heatwave scorched the continent’s northern tip earlier this year.
Scientists identified 1,679 separate blooms of green algae on the snow surface, covering an area of 1.9 km2 — which equates to a carbon sink of around 479 tons per year. A carbon sink is a reservoir that absorbs more carbon than it releases.
Researchers believe the organisms will expand as global temperatures increase.