Fine structure of the Suigetsu atmospheric 14C record 10-27 cal. ka turns out as authentic base for improved global correlation of 14C-dated planktic records of ocean climate

<p>The fine structure of the Suigetsu-based atmospheric ¹⁴C age plateaus (¹⁴C age changes little with time) and jumps (¹⁴C age changes faster than real time) provides a suite of authentic structures between 10 and 27 cal. ka. They can be identified by various independent techniques, such as visual inspection, the 1st derivative of ¹⁴C ages against time, and a Bayesian spline of ¹⁴C concentrations against time. The global significance of these structures, after a time scale update by Bronk Ramsey et al. (2020) and minor adjustments, is shown by the coherence with pertinent structures in the tree ring record 10 to ~15 cal. ka. The millennial-to-centennial-scale atmospheric ¹⁴C fluctuations influence local surface-ocean ¹⁴C concentrations and may be recovered from high-resolution planktic sediment records around the world ocean, despite various processes that lead to partial distortion of a sediment record. The Suigetsu suite of atmospheric ¹⁴C structures, identified in high-resolution planktic sediment records, thus may serve as a unique tool for global stratigraphic correlation and improved dating of paleoceanographic records, independent of local marine reservoir effects (Sarnthein et al., 2020).</p><p>Bronk Ramsey et al. (2020), Radiocarbon 62/4, https://doi.org/10.1017/RDC.2020.18,</p><p>Sarnthein et al. (2020), Climate Past 16, https://doi: 10.5194/cp-16-2547-2020,</p>