Reorganization of Atlantic Waters at sub-polar latitudes linked to deep-water overflow in both glacial and interglacial climate states

Holmes, Dakota E, Babila, Tali L, Ninnemann, Ulysses, Bromley, Gordon, Tyrrell, Shane, Paterson, Greig A ORCID: 0000-0002-6864-7420, Curran, Michelle J and Morley, Audrey (2022) Reorganization of Atlantic Waters at sub-polar latitudes linked to deep-water overflow in both glacial and interglacial climate states. CLIMATE OF THE PAST, 18 (5). pp. 989-1009.

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Holmes et al., 2022, Reorganization of Atlantic Waters at sub-polar latitudes linked to deep-water overflow in both glacial and interglacial climate states.pdf - Published version
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Official URL: http://dx.doi.org/10.5194/cp-18-989-2022

Abstract

<jats:p>Abstract. While a large cryosphere may be a necessary boundary condition for millennial-scale events to persist, a growing body of evidence from previous interglacial periods suggests that high-magnitude climate events are possible during low-cryosphere climate states. However, the full spectrum of variability, and the antecedent conditions under which such variability can occur, have not been fully described. As a result, the mechanisms generating high-magnitude climate variability during low-cryosphere boundary conditions remain unclear. In this study, high-resolution climate records from Deep Sea Drilling Project (DSDP) site 610 are used to portray the North Atlantic climate's progression through low ice, boundary conditions of Marine Isotope Stage (MIS) 11c into the glacial inception. We show that this period is marked by two climate events displaying rapid shifts in both deep overflow and surface climate. The reorganization between Polar Water and Atlantic Water at subpolar latitudes appears to accompany changes in the flow of deep water emanating from the Nordic Seas, regardless of magnitude or boundary conditions. Further, during both intermediate and low ice boundary conditions, we find that a reduction in deep water precedes surface hydrographic change. The existence of surface and deep-ocean events, with similar magnitudes, abruptness, and surface–deep phasing, advances our mechanistic understanding of, and elucidates antecedent conditions that can lead to, high-magnitude climate instability. </jats:p>

Item Type:	Article
Uncontrolled Keywords:	13 Climate Action
Divisions:	Faculty of Science and Engineering > School of Environmental Sciences
Depositing User:	Symplectic Admin
Date Deposited:	06 Jun 2022 08:29
Last Modified:	15 Mar 2024 14:34
DOI:	10.5194/cp-18-989-2022
Open Access URL:	https://cp.copernicus.org/articles/18/989/2022/
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3155936