Constraining the Variability of the Atlantic Meridional Overturning Circulation During the Holocene
Détails
Télécharger: Geophysical Research Letters - 2019 - Lippold - Constraining the Variability of the Atlantic Meridional Overturning.pdf (6538.92 [Ko])
Etat: Public
Version: Final published version
Licence: CC BY 4.0
Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_858DEE5A97C5
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Constraining the Variability of the Atlantic Meridional Overturning Circulation During the Holocene
Périodique
Geophysical Research Letters
ISSN
0094-8276
1944-8007
1944-8007
Statut éditorial
Publié
Date de publication
28/10/2019
Peer-reviewed
Oui
Volume
46
Numéro
20
Pages
11338-11346
Langue
anglais
Résumé
There is a converging body of evidence supporting a measurable slowdown of the Atlantic Meridional Overturning Circulation (AMOC) as climate warms and Northern Hemisphere ice sheets inexorably shrink. Within this context, we assess the variability of the AMOC during the Holocene based on a marine sediment core retrieved from the deep northwest Atlantic, which sensitively recorded large-scale deglacial transitions in deep water circulation. While there is a diffuse notion of Holocene variability in Labrador and Nordic Seas overturning, we report a largely invariable deep water circulation for the last ~11,000 years, even during the meltwater pulse associated with the 8.2-ka event. Sensitivity tests along with high-resolution 231Pa/230Th data constrain the duration and the magnitude of possible Holocene AMOC variations. The generally constant baseline during the Holocene suggests attenuated natural variability of the large-scale AMOC on submillennial timescales and calls for compensating effects involving the upstream components of North Atlantic Deep Water.
Mots-clé
AMOC, Holocene, high resolution 231Pa/230Th, Bermuda Rise, sensitivity tests
Web of science
Open Access
Oui
Financement(s)
Fonds national suisse / 200021_163003
Création de la notice
06/09/2021 13:43
Dernière modification de la notice
12/07/2024 8:44