@article{d5dec28f57e646b99370f962278fffe7,
title = "Marine anoxia linked to abrupt global warming during Earth{\textquoteright}s penultimate icehouse",
abstract = "Piecing together the history of carbon (C) perturbation events throughout Earth{\textquoteright}s history has provided key insights into how the Earth system responds to abrupt warming. Previous studies, however, focused on short-term warming events that were superimposed on longer-term greenhouse climate states. Here, we present an integrated proxy (C and uranium [U] isotopes and paleo CO2) and multicomponent modeling approach to investigate an abrupt C perturbation and global warming event (∼304 Ma) that occurred during a paleo-glacial state. We report pronounced negative C and U isotopic excursions coincident with a doubling of atmospheric CO2 partial pressure and a biodiversity nadir. The isotopic excursions can be linked to an injection of ∼9,000 Gt of organic matter–derived C over ∼300 kyr and to near 20% of areal extent of seafloor anoxia. Earth system modeling indicates that widespread anoxic conditions can be linked to enhanced thermocline stratification and increased nutrient fluxes during this global warming within an icehouse.",
keywords = "C isotope excursions, C-perturbation events, U, greenhouse gas–driven abrupt global warming, late Paleozoic, marine anoxia",
author = "Jitao Chen and Monta{\~n}ez, {Isabel P.} and Shuang Zhang and Isson, {Terry T.} and Macarewich, {Sophia I.} and Planavsky, {Noah J.} and Feifei Zhang and Sofia Rauzi and Kierstin Daviau and Le Yao and Qi, {Yu Ping} and Yue Wang and Fan, {Jun Xuan} and Poulsen, {Christopher J.} and Anbar, {Ariel D.} and Shen, {Shu Zhong} and Wang, {Xiang Dong}",
note = "Funding Information: ACKNOWLEDGMENTS. This research was supported by the National Natural Science Foundation of China (Grants 42072035, 91955201, 41630101, and 41830323), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant XDB26000000), and the NSF (Grants EAR1338281 to I.P.M. and 1338200 to C.J.P.). We thank G. Gordon and S. J. Romaniello for assistance in uranium column chemistry and multicollector–inductively coupled plasma mass spectrometer analysis, J. Groves for sharing the database for foraminifera biodiversity, and H. C. Wu and Q. Fang for recalibration of the astronomical ages of the samples from the Naqing succession in South China. We also thank Ethan Grossman for editorial handling of the paper, and we thank three anonymous reviewers for their valued contributions. Publisher Copyright: {\textcopyright} 2022 the Author(s).",
year = "2022",
month = may,
day = "10",
doi = "10.1073/pnas.2115231119",
language = "English (US)",
volume = "119",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
publisher = "National Academy of Sciences",
number = "19",
}