Numerical evidence for thermohaline circulation reversals during the Maastrichtian

Emmanuelle Puceat 1 Yannick Donnadieu 1 Gilles Ramstein 1 Frédéric Fluteau 2 François Guillocheau 3
1 LSCE - Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
2 IPGP - Institut de Physique du Globe de Paris
3 GR - Géosciences Rennes
Abstract : The sensitivity of the Maastrichtian thermohaline circulation to the opening/closing of marine communications between the Arctic and North Pacific oceans is investigated through a set of numerical experiments using the model CLIMBER-2 ( Earth Model of Intermediate Complexity). We show here that the opening or closing of an Arctic-Pacific marine gateway induces transitions between different equilibrium states of the thermohaline circulation. Sensitivity tests of the inferred modes of thermohaline circulation to atmospheric CO2 level changes have also been explored. An abrupt switch in deep convection from high northern to high southern latitudes, a change consistent with isotopic evidences, is reproduced by our simulations. The switch is caused by a combination of increased atmospheric CO2 concentration and inflow in the North Pacific of low-salinity Arctic waters when the Arctic-Pacific marine gateway is opened. The state of the gateway (open/closed) may have changed rapidly through variations in sea level that have been inferred for the Maastrichtian period.
Document type :
Journal articles
Complete list of metadatas

Cited literature [45 references]  Display  Hide  Download
https://hal.archives-ouvertes.fr/hal-00085486
Contributor : Isabelle Dubigeon <>
Submitted on : Friday, June 9, 2017 - 8:44:14 AM
Last modification on : Friday, April 5, 2019 - 8:12:40 PM
Long-term archiving on : Sunday, September 10, 2017 - 12:48:40 PM

File

Puc-at_et_al-2005-Geochemistry...
Publisher files allowed on an open archive

Identifiers

Collections

UPMC | UVSQ | CNRS | GR | UNIV-RENNES1 | CEA | LSCE | INSU | IPGP | GR-PPDB | USPC | OSUR | CEA-DRF | UNIV-RENNES | SORBONNE-UNIVERSITE | UNIV-PARIS7

Citation

Emmanuelle Puceat, Yannick Donnadieu, Gilles Ramstein, Frédéric Fluteau, François Guillocheau. Numerical evidence for thermohaline circulation reversals during the Maastrichtian. Geochemistry, Geophysics, Geosystems, AGU and the Geochemical Society, 2005, 6, art. no. Q11012, 13 p. ⟨10.1029/2005GC000998⟩. ⟨hal-00085486⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

364

Files downloads

148

Contact

CCSD