Southern Ocean link between changes in atmospheric CO2 levels and northern-hemisphere climate anomalies during the last two glacial periods ...

• Main Authors: Gottschalk, Julia, Skinner, Luke C., Jaccard, Samuel L., Menviel, Laurie, Nehrbass-Ahles, Christoph, Waelbroeck, Claire
• Format: Text
• Language: English
• Published: Elsevier 2020
• Subjects: 530 Physics; 550 Earth sciences & geology; Southern Ocean
• Online Access: https://dx.doi.org/10.7892/boris.139760; https://boris.unibe.ch/139760/

Past millennial-scale changes in atmospheric CO2 (CO2,atm) concentrations have often been attributed to variations in the overturning timescale of the ocean that result in changes in the marine carbon in- ventory. Yet, there remains a paucity of proxy evidence that documents changes in marine carbon storage globally, and that links them to abrupt climate variability in the northern hemisphere associated with perturbations of the Atlantic Meridional Overturning Circulation (AMOC). The last two glacial periods were suggested to differ in the spatial extent of the AMOC and its sensitivity to perturbations. This provides an opportunity to compare the nature of marine carbon cycle-climate feedbacks between them. Here, we reconstruct variations in respired carbon storage (via oxygenation) and the AMOC “geometry” (via carbonate ion saturation) in the deep South Atlantic. We infer decreases in deep South Atlantic respired carbon levels at times of weakened AMOC and rising CO2,atm concentrations during both glacial ...