Study on the last deglaciation section of sediment core GeoB6211-2 ...

• Main Authors: Chiessi, Cristiano Mazur, Mulitza, Stefan, Paul, André, Pätzold, Jürgen, Groeneveld, Jeroen, Wefer, Gerold
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2005
• Subjects: Gravity corer Kiel type; M46/2; Meteor 1986; Center for Marine Environmental Sciences MARUM; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.779878; https://doi.pangaea.de/10.1594/PANGAEA.779878

The North Atlantic Ocean underwent an abrupt temperature increase of 9 °C at high latitudes within a couple of decades during the transition from Heinrich event 1 (H1) to the Bølling warm event, but the mechanism responsible for this warming remains uncertain. Here we address this issue, presenting high-resolution last deglaciation planktic and benthic foraminiferal records of temperature and oxygen isotopic composition of seawater (d18OSW) for the subtropical South Atlantic. We identify a warming of ~6.5 °C and an increase in d18Osw of 1.2 per mil at the permanent thermocline during the transition, and a simultaneous warming of ~3.5 °C with no significant change in d18Osw at intermediate depths. Most of the warming can be explained by tilting the South Atlantic east-west isopycnals from a flattened toward a steepened position associated with a collapsed (H1) and strong (Bølling) Atlantic meridional overturning circulation (AMOC). However, this zonal seesaw explains an increase of just 0.3 per mil in ... : Supplement to: Chiessi, Cristiano Mazur; Mulitza, Stefan; Paul, André; Pätzold, Jürgen; Groeneveld, Jeroen; Wefer, Gerold (2008): South Atlantic interocean exchange as the trigger for the Bølling warm event. Geology, 36(12), 919-922 ...