reference : Observed fingerprint of a weakening Atlantic Ocean overturning circulation

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Bibliographic fields
reftype Journal Article
Abstract The Atlantic meridional overturning circulation (AMOC)—a system of ocean currents in the North Atlantic—has a major impact on climate, yet its evolution during the industrial era is poorly known owing to a lack of direct current measurements. Here we provide evidence for a weakening of the AMOC by about 3 ± 1 sverdrups (around 15 per cent) since the mid-twentieth century. This weakening is revealed by a characteristic spatial and seasonal sea-surface temperature ‘fingerprint’—consisting of a pattern of cooling in the subpolar Atlantic Ocean and warming in the Gulf Stream region—and is calibrated through an ensemble of model simulations from the CMIP5 project. We find this fingerprint both in a high-resolution climate model in response to increasing atmospheric carbon dioxide concentrations, and in the temperature trends observed since the late nineteenth century. The pattern can be explained by a slowdown in the AMOC and reduced northward heat transport, as well as an associated northward shift of the Gulf Stream. Comparisons with recent direct measurements from the RAPID project and several other studies provide a consistent depiction of record-low AMOC values in recent years.
Author Caesar, L.; Rahmstorf, S.; Robinson, A.; Feulner, G.; Saba, V.
DOI 10.1038/s41586-018-0006-5
Date 2018/04/01
ISSN 1476-4687
Issue 7700
Journal Nature
Pages 191-196
Title Observed fingerprint of a weakening Atlantic Ocean overturning circulation
Volume 556
Year 2018
Bibliographic identifiers
_record_number 25412
_uuid e943e910-fdb2-4671-a830-cac1a065ff6e