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Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition

Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition
Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition
The first major build-up of Antarctic glaciation occurred in two consecutive stages across the Eocene–Oligocene transition (EOT): the EOT-1 cooling event at ~34.1–33.9 Ma and the Oi-1 glaciation event at ~33.8–33.6 Ma. Detailed orbital-scale terrestrial environmental responses to these events remain poorly known. Here we present magnetic and geochemical climate records from the northeastern Tibetan Plateau margin that are dated precisely from ~35.5 to 31 Ma by combined magneto- and astro-chronology. These records suggest a hydroclimate transition at ~33.7 Ma from eccentricity dominated cycles to oscillations paced by a combination of eccentricity, obliquity, and precession, and confirm that major Asian aridification and cooling occurred at Oi-1. We conclude that this terrestrial orbital response transition coincided with a similar transition in the marine benthic δ18O record for global ice volume and deep-sea temperature variations. The dramatic reorganization of the Asian climate system coincident with Oi-1 was, thus, a response to coeval atmospheric CO2 decline and continental-scale Antarctic glaciation.
2041-1723
Ao, Hong
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Dupont-nivet, Guillaume
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Rohling, Eelco J.
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Zhang, Peng
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Ladant, Jean-baptiste
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Roberts, Andrew P.
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Licht, Alexis
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Liu, Qingsong
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Liu, Zhonghui
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Dekkers, Mark J.
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Coxall, Helen K.
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Jin, Zhangdong
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Huang, Chunju
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Xiao, Guoqiao
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Poulsen, Christopher J.
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Barbolini, Natasha
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Meijer, Niels
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Sun, Qiang
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Qiang, Xiaoke
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Yao, Jiao
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An, Zhisheng
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Ao, Hong
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Dupont-nivet, Guillaume
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Rohling, Eelco J.
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Zhang, Peng
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Ladant, Jean-baptiste
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Roberts, Andrew P.
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Licht, Alexis
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Liu, Qingsong
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Liu, Zhonghui
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Dekkers, Mark J.
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Coxall, Helen K.
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Jin, Zhangdong
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Huang, Chunju
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Xiao, Guoqiao
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Poulsen, Christopher J.
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Barbolini, Natasha
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Meijer, Niels
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Sun, Qiang
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Qiang, Xiaoke
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Yao, Jiao
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An, Zhisheng
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Ao, Hong, Dupont-nivet, Guillaume, Rohling, Eelco J., Zhang, Peng, Ladant, Jean-baptiste, Roberts, Andrew P., Licht, Alexis, Liu, Qingsong, Liu, Zhonghui, Dekkers, Mark J., Coxall, Helen K., Jin, Zhangdong, Huang, Chunju, Xiao, Guoqiao, Poulsen, Christopher J., Barbolini, Natasha, Meijer, Niels, Sun, Qiang, Qiang, Xiaoke, Yao, Jiao and An, Zhisheng (2020) Orbital climate variability on the northeastern Tibetan Plateau across the Eocene–Oligocene transition. Nature Communications, 11 (1), [5249]. (doi:10.1038/s41467-020-18824-8).

Record type: Article

Abstract

The first major build-up of Antarctic glaciation occurred in two consecutive stages across the Eocene–Oligocene transition (EOT): the EOT-1 cooling event at ~34.1–33.9 Ma and the Oi-1 glaciation event at ~33.8–33.6 Ma. Detailed orbital-scale terrestrial environmental responses to these events remain poorly known. Here we present magnetic and geochemical climate records from the northeastern Tibetan Plateau margin that are dated precisely from ~35.5 to 31 Ma by combined magneto- and astro-chronology. These records suggest a hydroclimate transition at ~33.7 Ma from eccentricity dominated cycles to oscillations paced by a combination of eccentricity, obliquity, and precession, and confirm that major Asian aridification and cooling occurred at Oi-1. We conclude that this terrestrial orbital response transition coincided with a similar transition in the marine benthic δ18O record for global ice volume and deep-sea temperature variations. The dramatic reorganization of the Asian climate system coincident with Oi-1 was, thus, a response to coeval atmospheric CO2 decline and continental-scale Antarctic glaciation.

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Accepted/In Press date: 16 September 2020
Published date: 16 October 2020

Identifiers

Local EPrints ID: 444771
URI: http://eprints.soton.ac.uk/id/eprint/444771
ISSN: 2041-1723
PURE UUID: 820f89a7-c49a-431a-8d20-5a197638cb01
ORCID for Eelco J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

Catalogue record

Date deposited: 04 Nov 2020 17:31
Last modified: 26 Nov 2021 02:37

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Contributors

Author: Hong Ao
Author: Guillaume Dupont-nivet
Author: Peng Zhang
Author: Jean-baptiste Ladant
Author: Andrew P. Roberts
Author: Alexis Licht
Author: Qingsong Liu
Author: Zhonghui Liu
Author: Mark J. Dekkers
Author: Helen K. Coxall
Author: Zhangdong Jin
Author: Chunju Huang
Author: Guoqiao Xiao
Author: Christopher J. Poulsen
Author: Natasha Barbolini
Author: Niels Meijer
Author: Qiang Sun
Author: Xiaoke Qiang
Author: Jiao Yao
Author: Zhisheng An

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