The University of Southampton
University of Southampton Institutional Repository

Stability of the thermohaline circulation under millennial CO2 forcing and two alternative controls on Atlantic salinity

Stability of the thermohaline circulation under millennial CO2 forcing and two alternative controls on Atlantic salinity
Stability of the thermohaline circulation under millennial CO2 forcing and two alternative controls on Atlantic salinity
A large ensemble of experiments with an efficient climate model is carried out to examine stability of the oceanic thermohaline circulation (THC) as a function of two key processes that maintain high Atlantic salinities: the “Atmospheric Bridge” by which moisture is exported from the Atlantic to the Pacific; and “Agulhas Leakage” of salty Indian Ocean waters into the Atlantic. We find that irreversible THC collapse during the next millennium is five times more likely if Agulhas Leakage dominates over the Atmospheric Bridge. This finding is consistent with freshwater import to the Atlantic sector associated with the overturning circulation, when the Atmospheric Bridge dominates. In contrast, slight freshwater export is associated with the overturning circulation under strong Agulhas Leakage, helping to maintain higher Atlantic salinity. Predictions of future climate change therefore critically depend on better understanding of the relative importance of the Atmospheric Bridge and Agulhas Leakage.
thc, agulhas leakage, atmospheric bridge
0094-8276
L03605-[5pp]
Marsh, R.
702c2e7e-ac19-4019-abd9-a8614ab27717
Hazeleger, W.
0bd826a1-4713-43ab-aace-3ea59d2fc37e
Yool, A.
882aeb0d-dda0-405e-844c-65b68cce5017
Rohling, E.J.
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Marsh, R.
702c2e7e-ac19-4019-abd9-a8614ab27717
Hazeleger, W.
0bd826a1-4713-43ab-aace-3ea59d2fc37e
Yool, A.
882aeb0d-dda0-405e-844c-65b68cce5017
Rohling, E.J.
a2a27ef2-fcce-4c71-907b-e692b5ecc685

Marsh, R., Hazeleger, W., Yool, A. and Rohling, E.J. (2007) Stability of the thermohaline circulation under millennial CO2 forcing and two alternative controls on Atlantic salinity. Geophysical Research Letters, 34 (3), L03605-[5pp]. (doi:10.1029/2006GL027815).

Record type: Article

Abstract

A large ensemble of experiments with an efficient climate model is carried out to examine stability of the oceanic thermohaline circulation (THC) as a function of two key processes that maintain high Atlantic salinities: the “Atmospheric Bridge” by which moisture is exported from the Atlantic to the Pacific; and “Agulhas Leakage” of salty Indian Ocean waters into the Atlantic. We find that irreversible THC collapse during the next millennium is five times more likely if Agulhas Leakage dominates over the Atmospheric Bridge. This finding is consistent with freshwater import to the Atlantic sector associated with the overturning circulation, when the Atmospheric Bridge dominates. In contrast, slight freshwater export is associated with the overturning circulation under strong Agulhas Leakage, helping to maintain higher Atlantic salinity. Predictions of future climate change therefore critically depend on better understanding of the relative importance of the Atmospheric Bridge and Agulhas Leakage.

This record has no associated files available for download.

More information

Published date: 7 February 2007
Keywords: thc, agulhas leakage, atmospheric bridge
Organisations: Ocean and Earth Science, National Oceanography Centre,Southampton

Identifiers

Local EPrints ID: 43852
URI: http://eprints.soton.ac.uk/id/eprint/43852
ISSN: 0094-8276
PURE UUID: ebd50d5b-f6d2-4cd0-9f35-e0eb8cdf19fc
ORCID for E.J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

Catalogue record

Date deposited: 31 Jan 2007
Last modified: 23 Jul 2022 01:37

Export record

Altmetrics

Contributors

Author: R. Marsh
Author: W. Hazeleger
Author: A. Yool
Author: E.J. Rohling ORCID iD

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×