globalchange  > 影响、适应和脆弱性
DOI: 10.5194/cp-14-1035-2018
Scopus记录号: 2-s2.0-85049900359
论文题名:
Dynamics of sediment flux to a bathyal continental margin section through the Paleocene-Eocene Thermal Maximum
作者: Dunkley Jones T.; Manners H.R.; Hoggett M.; Turner S.K.; Westerhold T.; Leng M.J.; Pancost R.D.; Ridgwell A.; Alegret L.; Duller R.; Grimes S.T.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期:7
起始页码: 1035
结束页码: 1049
语种: 英语
Scopus关键词: accumulation rate ; bathyal zone ; carbon isotope ; carbon sequestration ; Cenozoic ; continental margin ; global climate ; global warming ; organic carbon ; Paleocene ; Paleocene-Eocene boundary ; paleoclimate ; sediment ; sediment transport ; stable isotope ; stratigraphic correlation ; weathering ; Basque Country [Spain] ; Gipuzkoa ; Spain ; Zumaia
英文摘要: The response of the Earth system to greenhouse-gas-driven warming is of critical importance for the future trajectory of our planetary environment. Hyperthermal events - past climate transients with global-scale warming significantly above background climate variability - can provide insights into the nature and magnitude of these responses. The largest hyperthermal of the Cenozoic was the Paleocene-Eocene Thermal Maximum (PETM ∼ 56 Ma). Here we present new high-resolution bulk sediment stable isotope and major element data for the classic PETM section at Zumaia, Spain. With these data we provide a new detailed stratigraphic correlation to other key deep-ocean and terrestrial PETM reference sections. With this new correlation and age model we are able to demonstrate that detrital sediment accumulation rates within the Zumaia continental margin section increased more than 4-fold during the PETM, representing a radical change in regional hydrology that drove dramatic increases in terrestrial-to-marine sediment flux. Most remarkable is that detrital accumulation rates remain high throughout the body of the PETM, and even reach peak values during the recovery phase of the characteristic PETM carbon isotope excursion (CIE). Using a series of Earth system model inversions, driven by the new Zumaia carbon isotope record, we demonstrate that the silicate weathering feedback alone is insufficient to recover the PETM CIE, and that active organic carbon burial is required to match the observed dynamics of the CIE. Further, we demonstrate that the period of maximum organic carbon sequestration coincides with the peak in detrital accumulation rates observed at Zumaia. Based on these results, we hypothesise that orbital-scale variations in subtropical hydro-climates, and their subsequent impact on sediment dynamics, may contribute to the rapid climate and CIE recovery from peak-PETM conditions. © 2018 Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109546
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom; School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon, PL4 8AA, United Kingdom; School of Ocean and Earth Sciences, National Oceanography Centre, University of Southampton, Southampton, SO14 3ZH, United Kingdom; Department of Earth Sciences, University of California, Riverside, CA 92521, United States; MARUM - Center for Marine Environmental Sciences, University of Bremen, Leobener Strasse, Bremen, 28359, Germany; NERC Isotope Geosciences Facilities, British Geological Survey, Nottingham, NG12 5GG, United Kingdom; Organic Geochemistry Unit, Cabot Institute, School of Chemistry, University of Bristol, Bristol, BS8 1TS, United Kingdom; Departamento de Ciencias de la Tierra, Instituto Universitario de Ciencias Ambientales, Universidad de Zaragoza, Zaragoza, 50009, Spain; Department of Earth, Ocean and Ecological Sciences, University of Liverpool, Liverpool, L69 3GP, United Kingdom; Centre for Environmental Geochemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom

Recommended Citation:
Dunkley Jones T.,Manners H.R.,Hoggett M.,et al. Dynamics of sediment flux to a bathyal continental margin section through the Paleocene-Eocene Thermal Maximum[J]. Climate of the Past,2018-01-01,14(7)
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