Fifteen million years ago, ocean circulation reversed oxygen patterns in the Atlantic and Pacific, a discovery that sheds light on today’s expanding low-oxygen zones and their impact on marine life.

KEY TAKEAWAY 15 million years ago, oxygen patterns in the Atlantic and Pacific were reversed.

KEY TAKEAWAY Ancient ocean circulation drove this flip, influenced by tectonic shifts.

KEY TAKEAWAY The findings could help predict future changes in marine oxygen levels.

KEY TAKEAWAY Low-oxygen zones threaten fisheries and marine ecosystems globally.

KEY FACT The Atlantic Ocean’s low-oxygen zones covered 40% more area than today’s Pacific oxygen-poor waters 15 million years ago.

Ancient Ocean Currents Flipped Atlantic and Pacific Oxygen Patterns 15 Million Years Ago

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