Gentoo penguins near Port Charcot, Antarctica

Mysterious Microbes Turning Polar Ice Pink, Speeding Up Melt

Thriving communities of red algae are doing something nefarious to the world's ice sheets: melting them more quickly.

Gentoo penguins make their way to and from their nests at Port Charcot, Antarctica.
Photograph by Acacia Johnson

A surprisingly happy and healthy ecosystem of algae is not only turning parts of the Greenland ice sheet pinkish-red, it’s contributing more than a little to the melting of one of the biggest frozen bodies of water in the world.

The discolored snow isn’t just an Arctic phenomenon. “It’s actually a global occurrence,” says Alexandre Anesio, a biogeochemist from the University of Bristol.

“In order for them to form visible blooms and increase the melting of the snow and ice, they just need the right conditions, which at a minimum involve basic nutrients and melting,” says Anesio. “As the climate gets warmer, the availability of liquid water from snow and ice becomes higher, favoring the growth of snow and ice algae.”

“I

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