Active North Atlantic deepwater formation during Heinrich Stadial 1 ...

• Main Authors: Repschläger, Janne, Zhao, Ning, Rand, Devin, Lisiecki, Lorraine, Muglia, Juan, Mulitza, Stefan, Schmittner, Andreas, Cartapanis, Olivier, Bauch, Henning A., Schiebel, Ralf, Haug, Gerald H.
• Format: Text
• Language: English
• Published: ETH Zurich 2021
• Subjects: Quaternary; Paleoceanography; North Atlantic; Data compilation stable isotopes; Iceland
• Online Access: https://dx.doi.org/10.3929/ethz-b-000505317; http://hdl.handle.net/20.500.11850/505317

Deepwater circulation significantly changed during the last deglaciation from a shallow to a deep-reaching overturning cell. This change went along with a drawdown of isotopically light waters into the abyss and a deep ocean warming that changed deep ocean stratification from a salinity-to a temperature-controlled mode. Yet, the exact mechanisms causing these changes are still unknown. Furthermore, the long-standing idea of a complete shutdown of North Atlantic deepwater formation during Heinrich Stadial 1 (HS1) (17.5–14.6 kyr BP) remains prevalent. Here, we present a new compilation of benthic δ13C and δ18O data from the North Atlantic at high temporal resolution with consistent age models, established as part of the international PAGES working group OC3, to investigate deepwater properties in the North Atlantic. The extensive compilation, which includes 105 sediment cores, reveals different water masses during HS1. A water mass with heavy δ13C and δ18O signature occupies the Iceland Basin, whereas between ... : Quaternary Science Reviews, 270 ...