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Other 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; +3 Authors
Open Access
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 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.

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61 references, page 1 of 7

Anderson, R. F., Fleisher, M. Q., and Lao, Y.: Glacial-interglacial variability in the delivery of dust to the central equatorial Pacific Ocean, Earth Planet. Sc. Lett., 242, 406-414, doi:10.1016/j.epsl.2005.11.061, 2006.

Böhm, E., Lippold, J., Gutjahr, M., Frank, M., Blaser, P., Antz, B., Fohlmeister, J., Frank, N., Andersen, M. B., and Deininger, M.: Strong and deep Atlantic meridional overturning circulation during the last glacial cycle, Nature, 517, 73-76, doi:10.1038/nature14059, 2015.

Bourillet, J.-F., Damy, G., Dussud, L., Sultan, N., Woerther, P., and Migeon, S.: Behaviour Of A Piston Corer From Accelerometers And New Insights On Quality Of The Recovery., Proc. 6th Int. Off shore Site Investig, Geotech. Conf., Confronting New Challenges Shar, Knowledge, 11-13 Sept. 2007, London, UK, available at: http://archimer.ifremer.fr/doc/00071/18198/ (last access: 3 November 2016), 2007. [OpenAIRE]

Boyle, E. A.: Is ocean thermohaline circulation linked to abrupt stadial/interstadial transitions?, Quaternary Sci. Rev., 19, 255-272, doi:10.1016/S0277-3791(99)00065-7, 2000.

Bradtmiller, L. I., McManus, J. F., and Robinson, L. F.: 231Pa = 230Th evidence for a weakened but persistent Atlantic meridional overturning circulation during Heinrich Stadial 1, Nat. Commun., 5, 5817, doi:10.1038/ncomms6817, 2014.

Broecker, W. S., Peteet, D. M., and Rind, D.: Does the oceanatmosphere system have more than one stable mode of operation?, Nature, 315, 21-26, doi:10.1038/315021a0, 1985.

Burckel, P., Waelbroeck, C., Gherardi, J. M., Pichat, S., Arz, H., Lippold, J., Dokken, T., and Thil, F.: Atlantic Ocean circulation changes preceded millennial tropical South America rainfall events during the last glacial, Geophys. Res. Lett., 42, 411-418, doi:10.1002/2014GL062512, 2015. [OpenAIRE]

Burckel, P., Waelbroeck, C., Luo, Y., Roche, D. M., Pichat, S., Jaccard, S. L., Gherardi, J.-M., Govin, A., Lippold, J., and Thil, F.: The Atlantic Meridional Overturning Circulation during the last glacial, Dataset #865401, doi:10.1594/PANGAEA.865401, 2016. [OpenAIRE]

Chapman, M. R., Shackleton, N. J., and Duplessy, J.-C.: Sea surface temperature variability during the last glacial-interglacial cycle: assessing the magnitude and pattern of climate change in the North Atlantic, Palaeogeogr. Palaeocl., 157, 1-25, doi:10.1016/S0031-0182(99)00168-6, 2000.

Chase, Z., Anderson, R. F., Fleisher, M. Q., and Kubik, P. W.: The influence of particle composition and particle flux on scavenging of Th, Pa and Be in the ocean, Earth Planet. Sc. Lett., 204, 215- 229, doi:10.1016/S0012-821X(02)00984-6, 2002.

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Funded by
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
, 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| SeaO2 - Past changes in Southern Ocean overturning circulation - implications for the partitioning of carbon and oxygen between the ocean and the atmosphere
Project
SeaO2 - Past changes in Southern Ocean overturning circulation - implications for the partitioning of carbon and oxygen between the ocean and the atmosphere
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: 144811
  • Funding stream: Careers | SNSF Professorships
, SNSF| Quantifying changes in the rate of North Atlantic Deep and Intermediate Water formation associated with abrupt climate changes during the late Quaternary
Project
Quantifying changes in the rate of North Atlantic Deep and Intermediate Water formation associated with abrupt climate changes during the late Quaternary
  • Funder: Swiss National Science Foundation (SNSF)
  • Project Code: 111588
  • Funding stream: Careers | Fellowships | Fellowships for prospective researchers
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Aurora Universities Network
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Climate of the Past (CP)
2018
Providers: Copernicus Publications
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