North Atlantic DSDP545 Mid-Cretaceous Biomarker SST and Carbon Model Data McAnena, A.; Flögel, S.; Hofmann, P.; Herrle, J.O.; Griesand, A.; Pross, J.; Talbot, H.M.; Rethemeyer, J.; Wallmann, K.; Wagner, T. McAnena, A. Flögel, S. Hofmann, P. Herrle, J.O. Griesand, A. Pross, J. Talbot, H.M. Rethemeyer, J. Wallmann, K. Wagner, T. carbon cycle earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,Core) earth science/paleoclimate/climate forcing|paleoclimatic modeling (carbon dioxide,null,null,parts per million,null,climate forcing|paleoclimatic modeling,null,null,N,model) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,based on GDGT2) earth science/paleoclimate/paleoclimatic modeling (delta 13C,calcium carbonate,null,per mil PDB,null,paleoclimatic modeling,null,null,N,model) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,based on TEX86) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,glycerol dialkyl glycerol tetraether index,one standard deviation,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,based on GDGT2) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,based on GDGT1) earth science/paleoclimate/paleoclimatic modeling (age,null,null,million years ago,null,paleoclimatic modeling,null,null,N,null) earth science/paleoclimate/paleoceanography (organic carbon,null,null,percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,calcium carbonate,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (tetraether index of 86 carbon atoms,null,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (identified coccolithophore,null,null,percent,null,paleoceanography,null,null,N,Nannoconids? Incompta?) earth science/paleoclimate/paleoceanography (delta 13C,organic matter,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (glycerol dialkyl glycerol tetraether,null,one standard deviation,dimensionless,null,paleoceanography,null,null,N,1 tetraethers) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,glycerol dialkyl glycerol tetraether index,one standard deviation,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,based on GDGT1) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,DSDP Leg) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,Section) earth science/paleoclimate/paleoceanography (depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (glycerol dialkyl glycerol tetraether,null,null,dimensionless,null,paleoceanography,null,null,N,1 tetraethers) earth science/paleoclimate/paleoceanography (branched and isoprenoid tetraether index,null,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,N,DSDP Site) earth science/paleoclimate/paleoceanography (identified coccolithophore,null,null,percent,null,paleoceanography,null,null,N,Repagulum parvidentatum) earth science/paleoclimate/paleoceanography (glycerol dialkyl glycerol tetraether,null,null,dimensionless,null,paleoceanography,null,null,N,2 tetraethers) earth science/paleoclimate/paleoceanography (glycerol dialkyl glycerol tetraether,null,one standard deviation,dimensionless,null,paleoceanography,null,null,N,2 tetraethers) earth science/paleoclimate/paleoclimatic modeling (organic carbon,sediment,null,teramole,null,paleoclimatic modeling,null,null,N,model of organic carbon burial) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (identified coccolithophore,null,null,percent,null,paleoceanography,null,null,N,Nannoconus sp.) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (DSDP 545>LATITUDE 33.6643>LONGITUDE -9.3647) 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 TEX86 proxy suggest that surface waters cooled by about 5°C during the two million years, coincident with a positive d13C excursion of approximately 2 per mil 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 d13C 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. STUDY NOTES: Mid-Cretaceous (121 - 111 ma) Total Organic Carbon and Carbon burial flux data, plus pCO2 and carbon burial model NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : McAnena, A. Investigator : Flögel, S. Investigator : Hofmann, P. Investigator : Herrle, J.O. Investigator : Griesand, A. Investigator : Pross, J. Investigator : Talbot, H.M. Investigator : Rethemeyer, J. Investigator : Wallmann, K. Investigator : Wagner, T. 2013-06-16 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/14568 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcanena2013/mcanena2013model.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcanena2013/mcanena2013geochem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcanena2013/mcanena2013model.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcanena2013/mcanena2013geochem.txt English https://www.ncdc.noaa.gov/paleo/study/14568 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcanena2013/mcanena2013model.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcanena2013/mcanena2013geochem.txt A. McAnena, S. Flögel, P. Hofmann, J.O. Herrle, A. Griesand, J. Pross, H.M. Talbot, J. Rethemeyer, K. Wallmann, and T. Wagner. 2013. Atlantic cooling associated with a marine biotic crisis during the mid-Cretaceous period. Nature Geoscience, DOI: 10.1038/ngeo1850 START YEAR: 121000000 cal yr BP * END YEAR: 111000000 cal yr BP -9.3647 33.6643 -9.3647 33.6643