气候变化领域集成服务门户(CCPortal): Eocene to Oligocene terrestrial Southern Hemisphere cooling caused by declining pCO 2

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DOI	10.1038/s41561-021-00788-z
	Eocene to Oligocene terrestrial Southern Hemisphere cooling caused by declining pCO 2
	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.
发表日期	2021
ISSN	17520894
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.
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206921
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
推荐引用方式 GB/T 7714	Lauretano V.,Kennedy-Asser A.T.,Korasidis V.A.,et al. Eocene to Oligocene terrestrial Southern Hemisphere cooling caused by declining pCO 2[J],2021.
APA	Lauretano V..,Kennedy-Asser A.T..,Korasidis V.A..,Wallace M.W..,Valdes P.J..,...&Naafs B.D.A..(2021).Eocene to Oligocene terrestrial Southern Hemisphere cooling caused by declining pCO 2.Nature Geoscience.
MLA	Lauretano V.,et al."Eocene to Oligocene terrestrial Southern Hemisphere cooling caused by declining pCO 2".Nature Geoscience (2021).