OSNAP and Earth’s Heat Pump: The Ocean Conveyor Belt

By Allison Shirreffs

The ocean covers more than 70% of the Earth and operates in a state of equilibrium with the atmosphere to regulate climate and CO2 levels. As a result, dynamics that affect the uptake of CO2 across the ocean surface affect global atmospheric temperatures.

Lozier, who ( in addition to her duties as dean and AGU president ) studies ocean circulation and the impact of ocean physics on marine ecosystems, is currently leading the NSF-funded project OSNAP, the Overturning in the Subpolar North Atlantic Program. OSNAP is an international observing network with a necklace of ocean instruments — strung from Canada to Greenland to Scotland — measuring what’s commonly known as “the ocean conveyor belt,” explains Lozier. “The overturning circulation is a huge current system that drives regional and global climate.

“What happens if the overturning circulation slows down because the waters of the surface warm — or if they get fresher because there’s more glacial melt?” Lozier asks. “If the ocean doesn’t take up as much CO2, that’s a good news, bad news story.” Good news because less CO2 in the water means fewer adverse effects, such as ocean acidification, but bad news because more CO2 stays in the atmosphere.

Read full article: https://news.gatech.edu/features/2021/08/leading-quest-ocean-solutions