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High temperatures in the terrestrial mid-latitudes during the early Palaeogene

High temperatures in the terrestrial mid-latitudes during the early Palaeogene
High temperatures in the terrestrial mid-latitudes during the early Palaeogene
The early Paleogene (56–48 Myr) provides valuable information about the Earth’s climate system in an equilibrium high pCO2 world. High ocean temperatures have been reconstructed for this greenhouse period, but land temperature estimates have been cooler than expected. This mismatch between marine and terrestrial temperatures has been difficult to reconcile. Here we present terrestrial temperature estimates from a newly calibrated branched glycerol dialkyl glycerol tetraether-based palaeothermometer in ancient lignites (fossilized peat). Our results suggest early Palaeogene mid-latitude mean annual air temperatures of 23–29 °C (with an uncertainty of ± 4.7 °C), 5–10 °C higher than most previous estimates. The identification of archaeal biomarkers in these same lignites, previously observed only in thermophiles and hyperthermophilic settings, support these high temperature estimates. These mid-latitude terrestrial temperature estimates are consistent with reconstructed ocean temperatures and indicate that the terrestrial realm was much warmer during the early Palaeogene than previously thought.
1752-0908
766–771
Naafs, B.D.A.
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Rohrssen, M.
f60bc8a6-3ec9-49cf-812c-d4a3dd286368
Inglis, G.N.
1651196d-916c-43cb-b5a0-9b3ecaf5d664
Lähteenoja, O.
63ac244e-d4bf-419b-92e7-d466e391cc86
Feakins, SJ
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Collinson, M.E.
4558b0e7-a6c1-4b1c-a6e8-36e3e9f3c320
Kennedy, E.M.
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Singh, P.K.
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Singh, M.P.
ea14a9f0-d54b-4113-969d-54f983a595ab
Lunt, D.J.
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Naafs, B.D.A.
b4e4a3c0-ef86-476f-a439-3ce7e192337a
Rohrssen, M.
f60bc8a6-3ec9-49cf-812c-d4a3dd286368
Inglis, G.N.
1651196d-916c-43cb-b5a0-9b3ecaf5d664
Lähteenoja, O.
63ac244e-d4bf-419b-92e7-d466e391cc86
Feakins, SJ
c561e20f-6f06-4db7-b118-b032d3c35089
Collinson, M.E.
4558b0e7-a6c1-4b1c-a6e8-36e3e9f3c320
Kennedy, E.M.
77346796-f312-4310-afd1-8192dc45a089
Singh, P.K.
95d5e721-2fc5-4aaf-95da-a71aa4a06b92
Singh, M.P.
ea14a9f0-d54b-4113-969d-54f983a595ab
Lunt, D.J.
5bfca8db-49a7-45dd-9855-43606a58788b

Naafs, B.D.A., Rohrssen, M., Inglis, G.N., Lähteenoja, O., Feakins, SJ, Collinson, M.E., Kennedy, E.M., Singh, P.K., Singh, M.P. and Lunt, D.J. (2018) High temperatures in the terrestrial mid-latitudes during the early Palaeogene. Nature Geoscience, 11 (10), 766–771. (doi:10.1038/s41561-018-0199-0).

Record type: Article

Abstract

The early Paleogene (56–48 Myr) provides valuable information about the Earth’s climate system in an equilibrium high pCO2 world. High ocean temperatures have been reconstructed for this greenhouse period, but land temperature estimates have been cooler than expected. This mismatch between marine and terrestrial temperatures has been difficult to reconcile. Here we present terrestrial temperature estimates from a newly calibrated branched glycerol dialkyl glycerol tetraether-based palaeothermometer in ancient lignites (fossilized peat). Our results suggest early Palaeogene mid-latitude mean annual air temperatures of 23–29 °C (with an uncertainty of ± 4.7 °C), 5–10 °C higher than most previous estimates. The identification of archaeal biomarkers in these same lignites, previously observed only in thermophiles and hyperthermophilic settings, support these high temperature estimates. These mid-latitude terrestrial temperature estimates are consistent with reconstructed ocean temperatures and indicate that the terrestrial realm was much warmer during the early Palaeogene than previously thought.

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Combined manuscript submitted June 2018 Naafs - Accepted Manuscript
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Accepted/In Press date: 5 July 2018
e-pub ahead of print date: 30 July 2018
Published date: October 2018

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Local EPrints ID: 437527
URI: http://eprints.soton.ac.uk/id/eprint/437527
ISSN: 1752-0908
PURE UUID: cb04efb2-5041-43f3-9860-373df3f995b7

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Date deposited: 04 Feb 2020 17:30
Last modified: 04 Feb 2020 18:04

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Contributors

Author: B.D.A. Naafs
Author: M. Rohrssen
Author: G.N. Inglis
Author: O. Lähteenoja
Author: SJ Feakins
Author: M.E. Collinson
Author: E.M. Kennedy
Author: P.K. Singh
Author: M.P. Singh
Author: D.J. Lunt

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