CATALYST PLANET - Trapped in Time: Antarctica’s Secret Blood Falls

With technology advancing at a record pace, few wonders remain that puzzle scientists. However, deep in the frigid tundra of Antarctica lies one marvel that has attracted photographers and skeptics alike.

Antarctica’s Blood Falls. arielwaldman. CC BY-NC 2.0.

In the Taylor Valley of Antarctica lies a mighty natural wonder called the Taylor Glacier. Although a spectacle in and of itself, the glacier is only an opening to an even more magnificent miracle. Sandwiched between Taylor Glacier and the underlying bedrock is a “lake” that leads to a “waterfall” known as Blood Falls. The spectacle earned its name due to the deep, murky red color of the water; the glacier releases a beautiful, bloody fountain where it has burst open. Photos of the site capture winding streams of water, which are painted with endless stripes of crimson and cream, flowing over the rocky landscape.

Geologist Thomas Griffith Taylor, for whom the Taylor Valley is named, first discovered the Blood Falls on a voyage in 1911; he was alarmed by the scarlet hue spilling from what is normally a monochrome, colorless landscape. For the remainder of the 20th century, explanations for the vermilion wonder came up short. It was not until 2015 that scientists finally concluded that the waterfall’s maroon color is due to the presence of iron oxides. Cracks in the glacier expose the iron to oxygen, causing it to turn red in the same way rusting bike spokes produce a brick-red hue. Previously, the long-standing theory for the coloring had been the presence of reddish algae, although the theory lacked sufficient evidence.

Taylor Glacier. Mike Martoccia. CC BY-SA 2.0.

However, Blood Falls still presented two seemingly insurmountable scientific dilemmas: how did the water get there in the first place, and why did the water not freeze under the weight of an enormous glacier? Luckily, researchers at the University of Alaska Fairbanks soon answered these questions: water channels brought it from an underground reservoir, and the heat released from the freezing of the glacier kept the lake in a liquid state.

In addition to the striking red color, researchers found the water to be very salty, but the source of this brine truly stumped scientists.

The team applied radio-echo sounding, the use of sound waves to measure the location of a distant object, to construct an extensive map of underground water channels. They concluded that the brine reached the falls through the channels after about 1.5 million years. The “lake” from which the brine is sourced was found to sit underneath the glacier, and has slowly absorbed iron from the bedrock. The brine seeps into the ice due to the high pressure of the glacier’s weight. Researchers concluded that the concealed lake never froze over due to the heat produced from the process of glacial freezing.

Finally, scientists stumbled upon a remarkable discovery: the lake houses microbial ecosystems that live off of sulfate in the water’s oxygen-depleted environment. The presence of the ecosystem gives scientists a vital clue to the processes of Earth’s early life forms, and provides a picture of what life could be like on oxygen-depleted planets.

To the untrained eye, Antarctica’s Blood Falls may appear to be just another facet of Mother Nature’s artistry, but any digging quickly reveals a complicated puzzle that scientists are still working to piece together.