Age model and air-sea CO2 exchange signatures reconstructions from sediment cores NEAP 4K and GGC90 ...

• Main Authors: Yu, Jimin, Oppo, Delia W, Jin, Zhangdong, Lacerra, Matthew, Ji, Xuan, Umling, Natalie E, Lund, David C, McCave, I Nick, Menviel, Laurie, Shao, Jun, Xu, Chen
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2022
• Subjects: Neogloboquadrina pachyderma
• Online Access: https://dx.doi.org/10.1594/pangaea.942299; https://doi.pangaea.de/10.1594/PANGAEA.942299

This data set contains the age model and air-sea CO2 exchange tracer ([CO32-]as) of deep water core NEAP 4K and Intermediate water core GGC90. Seawater [CO32-]as is calculated following the approach in Yu et al. (2019). The Seawater [CO32-]as reconstructions at GGC90 are obtained based on [CO32-] and [PO43-] from Lacerra et al. (2019) and Umling et al. (2019), but these data have not yet been used to infer air-sea CO2 exchange histories. Importantly, building upon previous work (Lund et al., 2015), 23 new radiocarbon dates substantially improve the GGC90 age model. We present new deep-water [CO32-] and [PO43-] reconstructions at NEAP 4K using benthic foraminiferal B/Ca and Cd/Ca, respectively. The age model for NEAP 4K is based on 4 new and 13 published radiocarbon dates (Hall et al., 2004) and new Neogloboquadrina pachyderma (sinistral) coiling ratios. Based on the novel approach to reconstruct upper Atlantic air-sea CO2 exchange signatures, we provide evidence for a net release of CO2 via the Atlantic ...