气候变化领域集成服务门户(CCPortal): Marine organic carbon burial increased forest fire frequency during Oceanic Anoxic Event 2

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DOI	10.1038/s41561-020-0633-y
	Marine organic carbon burial increased forest fire frequency during Oceanic Anoxic Event 2
	Boudinot F.G.; Sepúlveda J.
发表日期	2020
ISSN	17520894
起始页码	693
结束页码	698
卷号	13 期号:10
英文摘要	Volcanic-driven nutrient flux to the oceans stimulated marine productivity and organic matter burial during Oceanic Anoxic Event 2 (OAE2; ~94 million years ago). While the preferential burial of 13C-depleted organic matter led to a general 13C enrichment of sediments during the event, a 2‰ 13C depletion punctuated the first half of the event (known as the Plenus), raising questions about carbon cycle feedbacks during OAE2. Here we present organic geochemical evidence (for example, pyrogenic polycyclic aromatic hydrocarbons) from the Western Interior Seaway that indicates increased forest fire frequency in the western United States during the Plenus. Carbon mass balance equations, which account for the amount and carbon isotopic composition of atmospheric CO2 and forest biomass during OAE2, potentiate fires in the western United States as part of a widespread increase in forest fires that could have alone caused the global 2‰ 13C depletion during the Plenus. Plant biomarkers suggest that local precipitation and plant type did not change significantly, indicating that elevated atmospheric oxygen levels from widespread organic carbon burial increased the frequency of fires in wet forest ecosystems that were extensive during OAE2. Plant biomarkers also indicate that forest fires amplified the flux of terrestrial organic matter and nutrients to the oceans, which may have enhanced marine productivity, organic carbon burial and the return to 13C-enriched sediments at the end of the Plenus. The extent that this feedback impacted global biogeochemistry during the Plenus and the rest of OAE2, as well as other events in Earth history, warrants further investigation. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	anoxic conditions; atmosphere-ocean coupling; carbon cycle; carbon dioxide; forest fire; organic carbon; precipitation (chemistry); terrestrial ecosystem; United States; Western Interior
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/206751
作者单位	Department of Geological Sciences, University of Colorado Boulder, Boulder, CO, United States; Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	Boudinot F.G.,Sepúlveda J.. Marine organic carbon burial increased forest fire frequency during Oceanic Anoxic Event 2[J],2020,13(10).
APA	Boudinot F.G.,&Sepúlveda J..(2020).Marine organic carbon burial increased forest fire frequency during Oceanic Anoxic Event 2.Nature Geoscience,13(10).
MLA	Boudinot F.G.,et al."Marine organic carbon burial increased forest fire frequency during Oceanic Anoxic Event 2".Nature Geoscience 13.10(2020).