Dark Oxygen Discovered in Deep Ocean Environments
by Ayelen Flores Ruiz, age 14
Researchers exploring the Pacific Ocean have discovered what they call “dark oxygen,” created in the absence of sunlight. This discovery, found in deep ocean environments where sunlight cannot reach, raises new questions about how oxygen can be produced without photosynthesis.
Photosynthesis occurs when plants use sunlight, water, and carbon dioxide to create sugars and oxygen. Scientists previously believed photosynthesis was the only way to produce oxygen. However, this discovery challenges that theory. Andrew Sweetman, a professor from the Scottish Association for Marine Science, led the team that found the "dark oxygen." He said, “I think we therefore need to revisit questions like: Where could aerobic life have begun?”
Although it's not yet clear how oxygen is created in deep, dark environments, researchers believe it might be connected to electrically charged minerals on the ocean floor known as polymetallic nodules. These nodules, which can vary in size up to that of a potato, may act like batteries, generating electrical charges that break down seawater and release oxygen. By linking multiple nodules together, researchers hypothesize they could produce higher voltages and increase oxygen levels. Tests conducted on the ocean floor have shown oxygen levels rising near these nodules. [Read More]