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The Glacier That 'Bleeds' Has Intrigued Scientists Since 1911

From Confidencial · () Spanish

Translated from Spanish, summarized and contextualized by DistantNews.

At a glance

In-depth Sources not specified Context piece
  • A glacier in Antarctica's McMurdo Dry Valleys has been intermittently releasing a red, iron-rich saltwater for over a century.
  • First observed in 1911 by geologist Thomas Griffith Taylor, the phenomenon, known as Blood Falls, was initially misattributed to algae.
  • Recent research reveals the red color stems from oxidized iron in ancient seawater trapped for up to 2 million years, flowing through a network of subglacial channels.

For more than a century, a peculiar phenomenon in Antarctica has captivated scientists: a glacier that appears to "bleed" a striking crimson hue. This natural spectacle, located in the McMurdo Dry Valleys, has puzzled researchers since its discovery by Australian geologist Thomas Griffith Taylor in 1911 during the Terra Nova Expedition.

The source of the vivid red flow, emanating from the Taylor Glacier, was initially a mystery. Taylor himself speculated it might be caused by reddish algae, a seemingly plausible explanation for the unsettling color. The site was subsequently named Blood Falls, a name that vividly captures the dramatic visual.

If the Earth were a living being, perhaps it would bleed. And, judging by what happens in a remote corner of Antarctica, it might even seem that it already does.

— ConfidencialDescribing the initial impression of the Blood Falls phenomenon.

However, scientific investigation has revealed a more complex and ancient origin. The red discharge is not blood or algae, but an extremely iron-rich brine. This hypersaline water has been sealed beneath the ice for an estimated 1.5 to 2 million years. Trapped in a geological prison, the seawater became increasingly concentrated.

It is not blood nor algae.

— ConfidencialClarifying the nature of the red discharge.

When this ancient brine finally reaches the surface and encounters oxygen, the iron within it oxidizes, much like rust forming on exposed metal. This oxidation process imparts the deep red, unsettling color to the melting ice. The water's high salinity prevents it from freezing, even at temperatures around minus 20 degrees Celsius, allowing it to flow.

Further research in 2017, using radar, uncovered a hidden network of pressurized channels extending at least 300 meters beneath the glacier's surface. This intricate system acts like a circulatory pathway, enabling the ancient brine to escape. The physics of the situation also explains how liquid water persists: as some brine freezes, it releases heat, keeping other parts of the channel system liquid.

The glacier was, in reality, traversed by a kind of invisible circulatory system.

— ConfidencialExplaining the discovery of subglacial channels.
DistantNews Editorial

Originally published by Confidencial in Spanish. Translated, summarized, and contextualized by our editorial team with added local perspective. Read our editorial standards.

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