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Cold spells in the Nordic Seas during the early Eocene Greenhouse

Earth Sciences

Cold spells in the Nordic Seas during the early Eocene Greenhouse

M. L. Vickers, S. K. Lengger, et al.

Discover groundbreaking findings from Madeleine L. Vickers and her team, revealing that during the early Eocene, regions of the Earth experienced surprisingly cool bottom water temperatures beneath 5 °C. This research introduces new insights into the climatic variability of that era, challenging long-held assumptions about a uniformly warm Earth.... show more
Abstract
The early Eocene (c. 56–48 Ma) was a globally warm greenhouse interval lacking polar ice, yet purported cold-climate indicators have been reported from higher latitudes. Here, clumped isotope paleothermometry is applied to ikaite-derived glendonite calcite from the early Eocene Fur Formation (Danish Basin) to quantify bottom-water temperatures. Results show glendonites formed in waters below 5 °C at shallow shelf depths (<300 m). These near-freezing conditions are unprecedented in proxy reconstructions for the early Eocene and suggest regionalized cold episodes punctuated background warmth, likely linked to eruptive phases of the North Atlantic Igneous Province (NAIP).
Publisher
Nature Communications
Published On
Sep 18, 2020
Authors
Madeleine L. Vickers, Sabine K. Lengger, Stefano M. Bernasconi, Nicolas Thibault, Bo Pagh Schultz, Alvaro Fernandez, Clemens V. Ullmann, Paul McCormack, Christian J. Bjerrum, Jan Audun Rasmussen, Iben Winther Hougård, Christoph Korte
DOI
https://doi.org/10.1038/s41467-020-18558-7
Tags
Eocene
climate change
glendonites
paleothermometry
North Atlantic Igneous Province
temperature estimates
cold episodes

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