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  On the relationship between Atlantic meridional overturning circulation slowdown and global surface warming

Caesar, L., Rahmstorf, S., Feulner, G. (2020): On the relationship between Atlantic meridional overturning circulation slowdown and global surface warming. - Environmental Research Letters, 15, 2, 024003.
https://doi.org/10.1088/1748-9326/ab63e3

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Caesar, Levke1, Autor              
Rahmstorf, Stefan1, Autor              
Feulner, Georg1, Autor              
Affiliations:
1Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Zusammenfassung: According to established understanding, deep-water formation in the North Atlantic and Southern Ocean keeps the deep ocean cold, counter-acting the downward mixing of heat from the warmer surface waters in the bulk of the world ocean. Therefore, periods of strong Atlantic meridional overturning circulation (AMOC) are expected to coincide with cooling of the deep ocean and warming of the surface waters. It has recently been proposed that this relation may have reversed due to global warming, and that during the past decades a strong AMOC coincides with warming of the deep ocean and relative cooling of the surface, by transporting increasingly warmer waters downward. Here we present multiple lines of evidence, including a statistical evaluation of the observed global mean temperature, ocean heat content, and different AMOC proxies, that lead to the opposite conclusion: even during the current ongoing global temperature rise a strong AMOC warms the surface. The observed weakening of the AMOC has therefore delayed global surface warming rather than enhancing it.

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 Datum: 2020
 Publikationsstatus: Final veröffentlicht
 Seiten: -
 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1088/1748-9326/ab63e3
PIKDOMAIN: RD1 - Earth System Analysis
eDoc: 8772
Research topic keyword: Oceans
Research topic keyword: Attribution
Regional keyword: Global
Organisational keyword: RD1 - Earth System Analysis
Working Group: Earth System Model Development
Working Group: Earth System Modes of Operation
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Titel: Environmental Research Letters
Genre der Quelle: Zeitschrift, SCI, Scopus, p3, oa
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 15 (2) Artikelnummer: 024003 Start- / Endseite: - Identifikator: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/150326
Publisher: IOP Publishing