Southeast Atlantic Holocene and Marine Isotope Stage 11 isotope, alkenone and SST data Dickson, A.J.; Beer, C.J.; Dempsey, C.; Maslin, M.A.; Bendle, J.A.; McClymont, E.L.; Pancost, R.D. Dickson, A.J. Beer, C.J. Dempsey, C. Maslin, M.A. Bendle, J.A. McClymont, E.L. Pancost, R.D. Meridional Overturning Circulation (MOC) Sea Surface Temperature Reconstruction earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides wuellerstorfi,null,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides wuellerstorfi,null,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,bsf) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Uvigerina sp.,null,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Neogloboquadrina incompta,null,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleoceanography (sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Globorotalia truncatulinoides,null,per mil,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,carbonate,null,per mil,null,paleoceanography,null,null,N,on fine fraction carbonate) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (GeoB1720-3>LATITUDE -28.9833>LONGITUDE 13.833333) (GeoB1720-2>LATITUDE -28.9833>LONGITUDE 13.833333) (ODP 1085>LATITUDE -29.37>LONGITUDE 13.6) The interglacial known as Marine Isotope Stage 11 has been proposed to be analogous to the Holocene, owing to similarities in the amplitudes of orbital forcing. It has been difficult to compare the periods, however, because of the long duration of Stage 11 and a lack of detailed knowledge of any extreme climate events that may have occurred. Here we use the distinctive phasing between seasurface temperatures and the oxygen-isotope records of benthic foraminifera in the southeast Atlantic Ocean to stratigraphically align the Holocene interglacial with the first half of the Marine Isotope Stage 11 interglacial optimum. This alignment suggests that the second half of Marine Isotope Stage 11 should not be used as a reference for 'pre-anthropogenic' greenhouse-gas emissions. By compiling benthic carbon-isotope records from sites in the Atlantic Ocean on a single timescale, we also find that meridional overturning circulation strengthened about 415,000 years ago, at a time of high orbital obliquity. We propose that this mechanism transported heat to the high northern latitudes, inhibiting significant ice-sheet build-up and prolonging interglacial conditions. We suggest that this mechanism may have also prolonged other interglacial periods throughout the past 800,000 years. STUDY NOTES: Depth is cm below sea floor. The age model for Site-1085 was determined by correlation of the benthic delta18O data to the LR04 curve. d18O values have been corrected to a common 'Uvigerina' scale by adding 0.64permil. Some d13C data from Site-1085 are on the basis of measurements of Uvigerina spp. corrected to C. wuellerstorfi values by adding 0.9permil. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Dickson, A.J. Investigator : Beer, C.J. Investigator : Dempsey, C. Investigator : Maslin, M.A. Investigator : Bendle, J.A. Investigator : McClymont, E.L. Investigator : Pancost, R.D. 2010-09-10 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9775 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dickson2009/dickson2009.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dickson2009/dickson2009.txt English https://www.ncdc.noaa.gov/paleo/study/9775 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dickson2009/dickson2009.txt Dickson, A.J., C.J. Beer, C. Dempsey, M.A. Maslin, J.A. Bendle, E.L. McClymont, and R.D. Pancost. 2009. Oceanic forcing of the Marine Isotope Stage 11 interglacial. Nature Geoscience 2, 428-433. Dickson, A.J., M.J. Leng, M.A. Maslin, H.J. Sloane, J. Green, J.A. Bendle, E.L. McClymont and R.D. Pancost. 2010. Atlantic overturning circulation and Agulhas leakage influences on southeast Atlantic upper ocean hydrography during marine isotope stage 11. Paleoceanography, 25, PA3208. Dickson, A.J., M.J. Leng and M.A. Maslin. 2008. Mid-depth South Atlantic Ocean circulation and chemical stratification during MIS-10 to 12: implications for atmospheric CO2. Climate of the Past 4, 333-344. START YEAR: 473780 cal yr BP * END YEAR: 0 cal yr BP 13.6 -29.37 13.833333 -28.9833