Atlantic cooling associated with a marine biotic crisis during the mid-Cretaceous period.

McAnena, A., Flögel, Sascha, Hofmann, P., Herrle, J. O., Griesand, A., Pross, J., Talbot, H. M., Rethemeyer, J., Wallmann, Klaus J. G. and Wagner, T. (2013) Atlantic cooling associated with a marine biotic crisis during the mid-Cretaceous period. Nature Geoscience, 6 (7). pp. 558-561. DOI 10.1038/NGEO1850.

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Most of the marine biotic crises that occurred during the hot Mesozoic era have been linked to episodes of extreme warmth(1,2). Others, however, may have occurred during cooler intervals that interrupted Cretaceous greenhouse warmth(3-5). There are some indications of cooling in the late Aptian(6-8) (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 TEX86 proxy suggest that surface waters cooled by about 5 degrees C during the two million years, coincident with a positive delta C-13 excursion of approximately 2 parts per thousand 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 delta C-13 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

Document Type: Article
Additional Information: WOS:000321002700019
Research affiliation: OceanRep > SFB 754 > A7
OceanRep > SFB 754
Kiel University
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-P-OZ Paleo-Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1038/NGEO1850
ISSN: 1752-0894
Projects: SFB754, Future Ocean
Date Deposited: 02 Aug 2013 08:43
Last Modified: 23 Sep 2019 20:44

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