08/25/2026
Researchers have pinpointed the source of oxygen that sustains deep-sea life in the North Atlantic Ocean: the churning waters in the Labrador Sea.
The study, published in Nature Geoscience on Aug. 17, gives heightened significance to the Labrador Sea, sandwiched between Greenland and Newfoundland. There, waters from the Atlantic Meridional Overturning Circulation (AMOC), the ocean’s major current system, turn in a gyre, and oxygen-rich surface waters mix with deeper waters. Previous research had found that the Labrador Sea has little impact on the strength of AMOC, but the study finds it plays a critical role in oxygen transport.
“We found that the Labrador Sea exports enough oxygen to meet the biological need across a vast part of the deep North Atlantic Ocean, so it’s very likely crucial to sustain these deep sea ecosystems,” said first author Una Miller, assistant professor of earth and atmospheric sciences in the College of Agriculture and Life Sciences at Cornell University.
“Our finding shows that if we’re going to understand the future, especially in the face of these deoxygenation trends, you can’t just look at the strength of AMOC, you also have to understand processes in the Labrador Sea.”
“No one’s successfully sustained multiple years of oxygen measurements on moorings like these before, so that was one breakthrough, along with a machine learning method to fill in gaps so we could map these oxygen values,” said senior author Jaime Palter of the URI Graduate School of Oceanography. “Now we know the rate of oxygenation, we know the processes, and we can link it with other work to show that the current needs to take this last step in the Labrador Sea in order for ecosystems to function.”
Read more: https://news.cornell.edu/stories/2026/08/life-deep-atlantic-depends-labrador-sea