DOI: 10.1038/s41561-020-0633-y
论文题名: Marine organic carbon burial increased forest fire frequency during Oceanic Anoxic Event 2
作者: Boudinot F.G. ; Sepúlveda J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 10 起始页码: 693
结束页码: 698
语种: 英语
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169560
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Boudinot F.G.,Sepúlveda J.. Marine organic carbon burial increased forest fire frequency during Oceanic Anoxic Event 2[J]. Nature Geoscience,2020-01-01,13(10)