High-resolution late-glacial chronology for the Gerzensee lake record (Switzerland): δ18O correlation between a Gerzensee-stack and NGRIP ...

• Main Authors: Colombaroli, Daniele, Schwander, Jakob, Van Leeuwen, Jacqueline F. N., Leuenberger, Markus, Eicher, Ueli, Gilli, Adrian, Van Raden, Ulrike J., Bernasconi, Stefano M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier 2013
• Subjects: 530 Physics; 580 Plants Botany; NGRIP; North Atlantic
• Online Access: https://dx.doi.org/10.7892/boris.52510; http://boris.unibe.ch/52510/

Oxygen-isotope variations were analyzed on bulk samples of shallow-water lake marl from Gerzensee, Switzerland, in order to evaluate major and minor climatic oscillations during the late-glacial. To highlight the overall signature of the Gerzensee δ18O record, δ18O records of four parallel sediment cores were first correlated by synchronizing major isotope shifts and pollen abundances. Then the records were stacked with a weighting depending on the differing sampling resolution. To develop a precise chronology, the δ18O-stack was then correlated with the NGRIP δ18O record applying a Monte Carlo simulation, relying on the assumption that the shifts in δ18O were climate-driven and synchronous in both archives. The established chronology on the GICC05 time scale is the basis for (1) comparing the δ18O changes recorded in Gerzensee with observed climatic and environmental fluctuations over the whole North Atlantic region, and (2) comparing sedimentological and biological changes during the rapid warming with ...