Study shows North Atlantic Ocean CO2 storage doubled over last decade

To determine the total uptake and storage of carbon dioxide in the North Atlantic over the last several decades, researchers analyzed data collected from the same locations, but 10 years apart, to identify changes caused by human-made CO₂. The data were collected during two National Science Foundation-funded international ship-based studies, CLIVAR (Climate Variability CO₂ Repeat Hydrography) and GO-SHIP (Global Ocean Ship-Based Hydrographic Investigations Program).

"This study shows the large impact all of us are having on the environment and that our use of fossil fuels isn't only causing the climate to change, but also affects the oceans by decreasing the pH," said Ryan Woosley, a researcher in the UM Rosenstiel School, Department of Ocean Sciences.

The oceans help to slow the growth of human produced CO₂ in the atmosphere by absorbing and storing about a quarter of the total carbon dioxide emissions. The North Atlantic is an area of high uptake and storage due to large-scale ocean circulations.

The uptake of CO₂ has many impacts on ocean-dwelling organisms by decreasing the pH. The findings have important implications for marine organisms, such as corals and mollusks, which require a certain pH level in the surrounding water to build their calcium carbonate-based shells and exoskeletons.

The researchers hope to return in another 10 years to determine if the increase in carbon uptake continues, or if, as many fear, it will decrease as a result of slowing thermohaline circulation.