气候变化领域集成服务门户(CCPortal): Late Ordovician climate change and extinctions driven by elevated volcanic nutrient supply

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DOI	10.1038/s41561-021-00855-5
	Late Ordovician climate change and extinctions driven by elevated volcanic nutrient supply
	Longman J.; Mills B.J.W.; Manners H.R.; Gernon T.M.; Palmer M.R.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:12
英文摘要	The Late Ordovician (~459–444 million years ago) was characterized by global cooling, glaciation and severe mass extinction. These events may have been driven by increased delivery of the nutrient phosphorus (P) to the ocean and associated increases in marine productivity, but it is not clear why this occurred in the two pulses identified in the geological record. We link both cooling phases—and the extinction—to volcanic eruptions through marine deposition of nutrient-rich ash and the weathering of terrestrially emplaced ash and lava. We then reconstruct the influence of Late Ordovician volcanic P delivery on the marine system by coupling an estimate of bioavailable phosphate supply (derived from a depletion and weathering model) to a global biogeochemical model. Our model compares volcanic ash P content in marine sediments before and after alteration to determine depletion factors, and we find good agreement with observed carbon isotope and reconstructed temperature shifts. Hence, massive volcanism can drive substantial global cooling on million-year timescales due to P delivery associated with long-term weathering of volcanic deposits, offsetting the transient warming of greenhouse gas emission associated with volcanic eruptions. Such longer-term cooling and potential for marine eutrophication may be important for other volcanism-driven global events. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	carbon isotope; climate change; eutrophication; explosive volcanism; glaciation; greenhouse gas; mass extinction; Ordovician; volcanic ash; volcanism
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/250823
作者单位	Marine Isotope Geochemistry, Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany; School of Geography and the Environment, University of Oxford, Oxford, United Kingdom; School of Earth and Environment, University of Leeds, Leeds, United Kingdom; School of Ocean and Earth Sciences, University of Southampton, Southampton, United Kingdom; School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth, United Kingdom
推荐引用方式 GB/T 7714	Longman J.,Mills B.J.W.,Manners H.R.,et al. Late Ordovician climate change and extinctions driven by elevated volcanic nutrient supply[J],2021,14(12).
APA	Longman J.,Mills B.J.W.,Manners H.R.,Gernon T.M.,&Palmer M.R..(2021).Late Ordovician climate change and extinctions driven by elevated volcanic nutrient supply.Nature Geoscience,14(12).
MLA	Longman J.,et al."Late Ordovician climate change and extinctions driven by elevated volcanic nutrient supply".Nature Geoscience 14.12(2021).