Scientists solve the mystery of rare GREEN icebergs seen only in Antarctica

Mail Online | 3/6/2019 | Chauncey Alcorn For
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Sailors and explorers have reported seeing strange green icebergs in parts of Antarctica since the early 1900s.

The bizarre phenomenon has baffled scientists for more than a century - but now researchers believe they've solved the mystery.

Study - Hue - Result - Iron - Oxides

A new study suggests the green hue is the result of iron oxides in rock dust from Antarctica’s mainland.

Researchers collected data during a 2016 voyage to the Amery Ice Shelf in East Antarctica.

Findings - Study - Icebergs - Revisited - Journal

They published the findings from their study 'Green Icebergs Revisited' in the Journal for Geophysical Research in January.

Scientists discovered large amounts of iron in the polar ice and theorized that 'foreign constituents' in seawater, particularly iron-oxide, can change its color.

Carbon - DOC - Color - Authors - Stephen

'Previously, dissolved organic carbon (DOC) had been proposed to be responsible for the green color,' authors Stephen Warren, Collin Roesler, Richard Brandt, and Mark Curran explained in their findings.

'Subsequent measurements of low DOC values in green icebergs, together with the recent finding of large concentrations of iron in marine ice from the Amery Ice Shelf, suggest that the color of green icebergs is caused more by iron‐oxide minerals than by DOC.'

Icebergs - Form - Ice - Antarctic - Ice

Icebergs that form from glacier ice that breaks off from the continent-sized Antarctic ice sheet can include frozen seawater collected at the glaciers' bases.

That frozen sea water, known as marine ice, can contain organic and inorganic particles that can add shades of...
(Excerpt) Read more at: Mail Online
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