Numerical evidence for thermohaline circulation reversals during the Maastrichtian
Emmanuelle Puceat
(1)
,
Yannick Donnadieu
(1, 2)
,
Gilles Ramstein
(1, 2)
,
Frédéric Fluteau
(3)
,
François Guillocheau
(4)
Yannick Donnadieu
- Fonction : Auteur
- PersonId : 12557
- IdHAL : yannick-donnadieu
- ORCID : 0000-0002-7315-2684
- IdRef : 081511728
Gilles Ramstein
- Fonction : Auteur
- PersonId : 758670
- ORCID : 0000-0002-1522-917X
- IdRef : 033153256
Frédéric Fluteau
- Fonction : Auteur
- PersonId : 752292
- IdHAL : frederic-fluteau
- ORCID : 0000-0002-9952-7325
- IdRef : 167063480
Résumé
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.
Domaines
OcéanographieFormat du dépôt | Fichier |
---|---|
Type de dépôt | Article dans une revue |
Titre |
en
Numerical evidence for thermohaline circulation reversals during the Maastrichtian
|
Résumé |
en
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.
|
Auteur(s) |
Emmanuelle Puceat
1
, Yannick Donnadieu
1, 2
, Gilles Ramstein
1, 2
, Frédéric Fluteau
3
, François Guillocheau
4
1
LSCE -
Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette]
( 518 )
- Bât. 12,
avenue de la Terrasse,
F-91198 GIF-SUR-YVETTE CEDEX
- France
2
CLIM -
Modélisation du climat
( 1007954 )
- LSCE. CEA Paris-Saclay. Orme des merisiers. 91190 Saint-Aubin.
- France
3
IPGP -
Institut de Physique du Globe de Paris
( 1852 )
- IPGP, 1 rue Jussieu, 75238 Paris cedex 05 ; Université Paris Diderot, Bât. Lamarck A case postale 7011, 75205 Paris CEDEX 13
- France
4
GR -
Géosciences Rennes
( 139 )
- Bâtiment 15 - Université de Rennes 1 - Campus de Beaulieu - CS 74205 - 35042 Rennes Cedex - France
- France
|
Langue du document |
Anglais
|
Nom de la revue |
|
Vulgarisation |
Non
|
Comité de lecture |
Oui
|
Audience |
Non spécifiée
|
Date de publication |
2005
|
Volume |
6
|
Page/Identifiant |
art. no. Q11012, 13 p.
|
Domaine(s) |
|
DOI | 10.1029/2005GC000998 |
Fichier principal
Puc-at_et_al-2005-Geochemistry,_Geophysics,_Geosystems.pdf ( 917.7 Ko
)
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