East Atlantic Pattern Drives Multidecadal Atlantic Meridional Overturning Circulation Variability during the Last Glacial Maximum

Song, Zhaoyang, Latif, Mojib and Park, Wonsun (In Press / Accepted) East Atlantic Pattern Drives Multidecadal Atlantic Meridional Overturning Circulation Variability during the Last Glacial Maximum Geophysical Research Letters . DOI 10.1029/2019GL082960.

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Abstract

The variability of the Atlantic Meridional Overturning Circulation (AMOC) and its governing processes during the Last Glacial Maximum (LGM) is investigated in the Kiel Climate Model (KCM). Under LGM conditions, multidecadal AMOC variability is mainly forced by the surface heat flux variability linked to the East Atlantic pattern (EAP). In contrast, the multidecadal AMOC variability under preindustrial conditions is mainly driven by the surface heat flux variability associated with the North Atlantic Oscillation (NAO). Stand‐alone atmosphere model experiments show that relative to preindustrial conditions, the change in AMOC forcing under LGM conditions is tightly linked to the differences in topography.
Key Points

Multidecadal AMOC variability during the LGM and its associated physical processes have been investigated by means of a climate model
Multidecadal AMOC variability during the LGM is mainly driven by surface heat flux variability linked to the East Atlantic pattern as opposed to the North Atlantic Oscillation under preindustrial conditions
Change in topography during the LGM is responsible for the change in AMOC forcing

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
DOI etc.: 10.1029/2019GL082960
ISSN: 0094-8276
Projects: Future Ocean, ISOS
Expeditions/Models:
Date Deposited: 01 Oct 2019 11:38
Last Modified: 01 Oct 2019 11:38
URI: http://eprints.uni-kiel.de/id/eprint/47853

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