research product . 2018

Changes in the geometry and strength of the Atlantic meridional overturning circulation during the last glacial (20–50 ka)

Burckel Pierre; Waelbroeck Claire; Luo Yiming; Roche Didier M; Pichat Sylvain; Jaccard Samuel L; Gherardi Jeanne-Marie; Govin Aline; Lippold Jörg; Thil François;
Open Access English
  • Published: 27 Sep 2018
Abstract
We reconstruct the geometry and strength of the Atlantic meridional overturning circulation during the 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...
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Funded by
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: 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
,
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: 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
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