Recent variability of North Atlantic transport and storage of anthropogenic C : A model-data comparison along the Ovide section
The North Atlantic Ocean is a major sink region for anthropogenic carbon and a major contributor to its global storage and transport. While evidence is growing that storage and transport are variable on interannual to decadal timescales, their evolution over recent decades, as well as underlying drivers are still poorly understood. The variability is thought to be controlled in large part by the intensity of the meridional overturning circulation (MOC), which is suggested to slow down over the 21st century. This study aims to investigate the relationship between transport of anthropogenic C across the Greenland-Portugal OVIDE section and its storage in the North Atlantic basin, as well as their combined evolution over the past 40 years. It relies on the combination of a pluriannual data set and output from the global biogeochemical ocean general circulation model NEMO/PISCES at 1/2° spatial resolution forced by the atmospheric reanalysis DFS4.2.