A solution for constraining past marine Polar Amplification

A. Morley (), E. Vega, M. Raitzsch, J. Bijma, U. Ninnemann, G. L. Foster, T. B. Chalk, J. Meilland, R. R. Cave, J. V. Büscher and M. Kucera
Additional contact information
A. Morley: School of Geography, Archaeology, and Irish Studies, and Ryan Institute
E. Vega: School of Geography, Archaeology, and Irish Studies, and Ryan Institute
M. Raitzsch: Dettmer Group GmbH & Co. KG.
J. Bijma: Helmholtz-Zentrum für Polar- und Meeresforschung
U. Ninnemann: Department of Earth Science and Bjerknes Centre for Climate Research
G. L. Foster: National Oceanography Centre Southampton
T. B. Chalk: Centre Européen de Recherche et d’enseignement des géosciences de l’environnement (CEREGE)
J. Meilland: University of Bremen
R. R. Cave: School of Natural Sciences
J. V. Büscher: School of Natural Sciences
M. Kucera: University of Bremen

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Most climate proxies of sea surface temperatures suffer from severe limitations when applied to cold temperatures that characterize Arctic environments. These limitations prevent us from constraining uncertainties for some of the most sensitive climate tipping points that can trigger rapid and dramatic global climate change such as Arctic/Polar Amplification, the disruption of the Atlantic Meridional Overturning Circulation, sea ice loss, and permafrost melting. Here, we present an approach to reconstructing sea surface temperatures globally using paired Mg/Ca - δ18Oc recorded in tests of the polar to subpolar planktonic foraminifera Neogloboquadrina pachyderma. We show that the fidelity of Mg/Ca-based paleoclimate reconstructions is compromised by variations in seawater carbonate chemistry which can be successfully quantified and isolated from paleotemperature reconstructions using a multiproxy approach. By applying the calibration to the last glacial maximum, we show that marine polar amplification has been underestimated by up to 3.0 ± 1.0 °C in model-based estimates.

Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-024-53424-w Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53424-w

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-024-53424-w

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().