globalchange  > 气候减缓与适应
DOI: 10.1038/NGEO1850
论文题名:
Atlantic cooling associated with a marine biotic crisis during the mid-Cretaceous period
作者: McAnena A.; Flögel S.; Hofmann P.; Herrle J.O.; Griesand A.; Pross J.; Talbot H.M.; Rethemeyer J.; Wallmann K.; Wagner T.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:7
起始页码: 558
结束页码: 561
语种: 英语
Scopus关键词: biogeochemical cycle ; cooling ; Cretaceous ; marine ecosystem ; micropaleontology ; nanoplankton ; ocean basin ; planktonic foraminifera ; sea surface temperature ; sediment core ; Atlantic Ocean ; Atlantic Ocean (North) ; Foraminifera
英文摘要: Most of the marine biotic crises that occurred during the hot Mesozoic era have been linked to episodes of extreme warmth. Others, however, may have occurred during cooler intervals that interrupted Cretaceous greenhouse warmth. There are some indications of cooling in the late Aptian (116-114 Myr ago), but it has not been definitively linked to biotic crisis. Here we assess the timing and magnitude of late Aptian cooling and its association with biotic crises using a suite of geochemical and micropalaeontological assessments from a marine sediment core from the North Atlantic Ocean as well as global biogeochemical modelling. Sea surface temperatures derived from the TEX 86 proxy suggest that surface waters cooled by about 5C during the two million years, coincident with a positive δ 13 C excursion of approximately 2‰ in carbonates and organic carbon. Surface productivity was enhanced during this period, but the abundance of planktonic foraminifera and nannoconid phytoplankton declined. Our simulations with a biogeochemical model indicate that the δ 13 C excursion associated with the cooling could be explained by the burial of about 812,000 gigatons of carbon over 2.5 million years. About 50% of the this carbon burial occurred in the Atlantic, Southern and Tethys ocean basins. We conclude that global cooling during greenhouse conditions can cause perturbations to marine ecosystems and biogeochemical cycles at scales comparable to those associated with global warming. © 2013 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/106744
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Department of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany; GEOMAR Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, 24148 Kiel, Germany; Institute of Geosciences, Goethe-University Frankfurt, D-60438 Frankfurt am Main, Germany; Biodiversity and Climate Research Centre (BIK-F), D-60325 Frankfurt am Main, Germany; School of Civil Engineering and Geosciences, Newcastle University, Newcastle Upon Tyne, NE1 7RU, United Kingdom; Institute of Marine and Coastal Science, Rutgers the State University of New Jersey, New Brunswick, NJ 08901, United States

Recommended Citation:
McAnena A.,Flögel S.,Hofmann P.,et al. Atlantic cooling associated with a marine biotic crisis during the mid-Cretaceous period[J]. Nature Geoscience,2013-01-01,6(7)
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