The Southern Ocean around Antarctica absorbs a significant share of the carbon dioxide emitted by human activity. For a while, it seemed to be slowing down. But studies say it has returned to normal, though the mechanics aren’t well understood.

After an unexpected lull, Earth’s Southern Ocean – a vast marine moat surrounding Antarctica – is pulling carbon dioxide out of the atmosphere at an increased clip.
The trend should ease concerns that the Southern Ocean may be losing its capacity to scrub CO2, a climate-altering greenhouse gas, from the atmosphere.
It also highlights how much remains to be learned about the factors governing CO2 uptake in Southern Ocean, researchers say.
By some estimates, the Southern Ocean accounts for 43 percent of the total ocean uptake of CO2 emissions humans pump into the atmosphere. But the controls on that uptake and their interplay are poorly understood. Solving those puzzles would put estimates of the ocean’s response to continued global warming on a more sound footing, researchers say. Continue reading Nature’s global warming ‘sink’ isn’t clogged anymore, studies say