globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2757
论文题名:
An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene Thermal Maximum
作者: Penman D.E.; Turner S.K.; Sexton P.F.; Norris R.D.; Dickson A.J.; Boulila S.; Ridgwell A.; Zeebe R.E.; Zachos J.C.; Cameron A.; Westerhold T.; Röhl U.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:8
起始页码: 575
结束页码: 580
语种: 英语
Scopus关键词: calcium carbonate ; carbon emission ; carbon sequestration ; carbonate system ; Hypsithermal ; marine sediment ; Paleocene-Eocene boundary ; seawater ; Atlantic Ocean ; Atlantic Ocean (North)
英文摘要: During the Palaeocene-Eocene Thermal Maximum (PETM) about 56 million years ago, thousands of petagrams of carbon were released into the atmosphere and ocean in just a few thousand years, followed by gradual sequestration over approximately 200,000 years. If silicate weathering is one of the key negative feedbacks that removed this carbon, a period of seawater calcium carbonate saturation greater than pre-event levels would be expected during the event's recovery phase. In marine sediments, this should be recorded as a temporary deepening of the depth below which no calcite is preserved-the calcite compensation depth (CCD). Previous and new sedimentary records from sites that were above the pre-PETM CCD show enhanced carbonate accumulation following the PETM. A new record from an abyssal site in the North Atlantic that lay below the pre-PETM CCD shows a period of carbonate preservation beginning about 70,000 years after the onset of the PETM, providing the first direct evidence for an over-deepening of the CCD. This record confirms an overshoot in ocean carbonate saturation during the PETM recovery. Simulations with two earth system models support scenarios for the PETM that involve a large initial carbon release followed by prolonged low-level emissions, consistent with the timing of CCD deepening in our record. Our findings indicate that sequestration of these carbon emissions was most likely the result of both globally enhanced calcite burial above the CCD and, at least in the North Atlantic, an over-deepening of the CCD. © 2016 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105963
Appears in Collections:气候减缓与适应
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作者单位: Department of Geology and Geophysics, Yale University, New Haven, CT, United States; Department of Earth Science, University of California, Riverside, CA, United States; Department of Environment, Earth and Ecosystems, Open University, Milton Keynes, United Kingdom; Scripps Institute of Oceanography, San Diego, CA, United States; Department of Earth Sciences, University of Oxford, Oxford, United Kingdom; Université Paris VI, CNRS UMR 7193, Institut des Sciences de la Terre-Paris (ISTeP), 4 place Jussieu, Paris Cedex 05, France; ASD, IMCCE-CNRS UMR 8028, Observatoire de Paris, 77 Avenue Denfert-Rochereau, Paris, France; Department of Oceanography, University of Hawaii at Manoa, Honolulu, HI, United States; Department of Earth and Planetary Science, University of California, Santa Cruz, CA, United States; MARUM-Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany

Recommended Citation:
Penman D.E.,Turner S.K.,Sexton P.F.,et al. An abyssal carbonate compensation depth overshoot in the aftermath of the Palaeocene-Eocene Thermal Maximum[J]. Nature Geoscience,2016-01-01,9(8)
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