globalchange  > 气候变化与战略
DOI: 10.1038/s41561-021-00788-z
论文题名:
Eocene to Oligocene terrestrial Southern Hemisphere cooling caused by declining pCO 2
作者: Lauretano V.; Kennedy-Asser A.T.; Korasidis V.A.; Wallace M.W.; Valdes P.J.; Lunt D.J.; Pancost R.D.; Naafs B.D.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
语种: 英语
英文摘要: The greenhouse-to-icehouse climate transition from the Eocene into the Oligocene is well documented by sea surface temperature records from the southwest Pacific and Antarctic margin, which show evidence of pronounced long-term cooling. However, identification of a driving mechanism depends on a better understanding of whether this cooling was also present in terrestrial settings. Here, we present a semi-continuous terrestrial temperature record spanning from the middle Eocene to the early Oligocene (~41–33 million years ago), using bacterial molecular fossils (biomarkers) preserved in a sequence of southeast Australian lignites. Our results show that mean annual temperatures in southeast Australia gradually declined from ~27 °C (±4.7 °C) during the middle Eocene to ~22–24 °C (±4.7 °C) during the late Eocene, followed by a ~2.4 °C-step cooling across the Eocene/Oligocene boundary. This trend is comparable to other temperature records in the Southern Hemisphere, suggesting a common driving mechanism, likely pCO 2. We corroborate these results with a suite of climate model simulations demonstrating that only simulations including a decline in pCO 2 lead to a cooling in southeast Australia consistent with our proxy record. Our data form an important benchmark for testing climate model performance, sea–land interaction and climatic forcings at the onset of a major Antarctic glaciation. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169777
Appears in Collections:气候变化与战略

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作者单位: Organic Geochemistry Unit, School of Chemistry, School of Earth Sciences, University of Bristol, Bristol, United Kingdom; Cabot Institute for the Environment, University of Bristol, Bristol, United Kingdom; Bristol Research Initiative for the Dynamic Global Environment, School of Geographical Sciences, University of Bristol, Bristol, United Kingdom; School of Earth Sciences, The University of Melbourne, Melbourne, VIC, Australia; Department of Paleobiology, Smithsonian Institution, Washington, DC, United States

Recommended Citation:
Lauretano V.,Kennedy-Asser A.T.,Korasidis V.A.,et al. Eocene to Oligocene terrestrial Southern Hemisphere cooling caused by declining pCO 2[J]. Nature Geoscience,2021-01-01
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