Global biosphere productivity changes during Heinrich Stadial 4: Preliminary results from the triple O2 isotopes and coupled climate model simulations ...

• Main Authors: Yang, Ji-Woong, Ladant, Jean-Baptiste, Landais, Amaëlle, Blunier, Thomas, Kageyama, Masa, Jaccard, Samuel, Duchamp-Alphonse, Stéphanie, Sánchez Goñi, María Fernanda, Prié, Frédéric
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Southern Ocean
• Online Access: https://dx.doi.org/10.57757/iugg23-2465; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5018287

<!--!introduction!--> The last glacial period was punctuated by a number of transient events during which massive iceberg discharges profoundly perturbed the deep ocean circulation dynamics, causing widespread climate and environmental changes. Detailed analysis of polar ice cores demonstrated millennial-scale atmospheric CO 2 variations characterized by rapid shifts between relatively cold (stadial) and warm (interstadial) stages and in particular, a gradual rising of CO 2 during Heinrich Stadials (HS). To date, the observed CO 2 increase during HS has been attributed to ventilation changes in Southern Ocean, and/or reduced biological uptake. However, understanding the respective contribution of ocean ventilation and changes in the efficiency of the biological carbon pump is challenging because of difficulties in estimating global biosphere productivity based on local reconstructions as they are often based on indirect geochemical tracers and exhibit spatial heterogeneities. To address this, we ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...