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Research data . Other dataset type . 2016

The Atlantic Meridional Overturning Circulation during the last glacial, supplement to: Burckel, Pierre; Waelbroeck, Claire; Luo, Yiming; Roche, Didier M; Pichat, Sylvain; Jaccard, Samuel L; Gherardi, Jeanne-Marie; Govin, Aline; Lippold, Jörg; Thil, François (2016): Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka). Climate of the Past, 12(11), 2061-2075

Burckel, Pierre; Waelbroeck, Claire; Luo, Yiming; Roche, Didier M; Pichat, Sylvain; Jaccard, Samuel L; Gherardi, Jeanne-Marie; +3 Authors
English
Published: 01 Jan 2016
Publisher: PANGAEA - Data Publisher for Earth & Environmental Science
Abstract
We reconstruct the geometry and strength of the Atlantic Meridional Overturning Circulation during Heinrich Stadial 2 and three Greenland interstadials of the 20-50 ka period based on the comparison of new and published sedimentary 231Pa/230Th data with simulated sedimentary 231Pa/230Th. We show that the deep Atlantic circulation during these interstadials was very different from that of the Holocene. Northern-sourced waters likely circulated above 2500 m depth, with a flow rate lower than that of the present day North Atlantic Deep Water (NADW). Southern-sourced deep waters most probably flowed northwards below 4000 m depth into the North Atlantic basin, and then southwards as a return flow between 2500 and 4000 m depth. The flow rate of this southern-sourced deep water was likely larger than that of the modern Antarctic Bottom Water (AABW). Our results further show that during Heinrich Stadial 2, the deep Atlantic was probably directly affected by a southern-sourced water mass below 2500 m depth, while a slow southward flowing water mass originating from the North Atlantic likely influenced depths between 1500 and 2500 m down to the equator.
Funded by
SNSF| Quantifying changes in the rate of North Atlantic Deep and Intermediate Water formation associated with abrupt climate changes during the late Quaternary
Project
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: PBEZ2--111588
  • Funding stream: Careers;Fellowships | Fellowships for prospective researchers
,
ANR| RETRO
Project
RETRO
Response of tropical Atlantic surface and intermediate waters to changes in the Atlantic meridional overturning circulation
  • Funder: French National Research Agency (ANR) (ANR)
  • Project Code: ANR-09-BLAN-0347
,
SNSF| SeaO2 - Past changes in Southern Ocean overturning circulation - implications for the partitioning of carbon and oxygen between the ocean and the atmosphere
Project
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: PP00P2_144811
  • Funding stream: Careers | SNSF Professorships
,
EC| ACCLIMATE
Project
ACCLIMATE
Elucidating the Causes and Effects of Atlantic Circulation Changes through Model-Data Integration
  • Funder: European Commission (EC)
  • Project Code: 339108
  • Funding stream: FP7 | SP2 | ERC
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