South Atlantic Stable Isotope and Geochemistry Data with Bottom Water Temperature Reconstruction across the Eocene-Oligocene Transition Pusz, A.E.; Thunell, R.C.; Miller, K.G. Pusz, A.E. Thunell, R.C. Miller, K.G. earth science/paleoclimate/climate reconstructions|paleoceanography (sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,bottom water temperature using the method of Raitzsch 2008) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,meters below sea floor) earth science/paleoclimate/paleoceanography (magnesium/calcium,Cibicidoides sp.,null,millimole per mole,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,Jobin Yvon Ultima Inductively Coupled Plasma Atomic Emission Spectrophotometer (ICP- AES)) earth science/paleoclimate/paleoceanography (sample identification,null,null,null,null,paleoceanography,null,null,C,IODP identification) earth science/paleoclimate/paleoceanography (notes,null,null,null,null,paleoceanography,null,null,C,null) earth science/paleoclimate/paleoceanography (age,null,null,million years ago,null,paleoceanography,null,null,N,using the Cande and Kent 1995 time scale) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,null,null,N,meters composite depth) earth science/paleoclimate/paleoceanography (delta 18O,Cibicidoides sp.,null,per mil VPDB,null,paleoceanography,null,mass spectrometry,N,Micromass Optima mass spectrometer at Rutgers University) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,meters composite depth) earth science/paleoclimate/climate reconstructions|paleoceanography (sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,bottom water temperature using the method of Raitzsch 2009) earth science/paleoclimate/paleoceanography (age,null,null,million years ago,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,million years ago,null,paleoceanography,null,null,N,Ages astronomically tuned) earth science/paleoclimate/paleoceanography (delta 13C,Cibicidoides sp.,null,per mil VPDB,null,paleoceanography,null,mass spectrometry,N,Micromass Optima mass spectrometer at Rutgers University) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 1090B>LATITUDE -42.913687>LONGITUDE 8.899737) (ODP 1265>LATITUDE -28.835017>LONGITUDE 2.639333) Paired benthic foraminiferal stable isotope and Mg/Ca data are used to estimate bottom water temperature (BWT) and ice volume changes associated with the Eocene-Oligocene Transition (EOT), the largest global climate event of the past 50 Myr. We utilized ODP Sites 1090 and 1265 in the South Atlantic to assess seawater d18O (dw), Antarctic ice volume, and sea level changes across the EOT (~33.8–33.54 Ma). We also use benthic d13C data to reconstruct the sources of the deep water masses in this region during the EOT. Our data, together with previously published records, indicate that a pulse of Northern Component Water influenced the South Atlantic immediately prior to and following the EOT. Benthic d18O records show a 0.5‰ increase at ~33.8 Ma (EOT-1) that represents a ~2°C cooling and a small (~10 m) eustatic fall that is followed by a 1.0‰ increase associated with Oi-1. The expected cooling of deep waters at Oi-1 (~33.54 Ma) is not apparent in our Mg/Ca records. We suggest the cooling is masked by coeval changes in the carbonate saturation state (?[CO32-]) which affect the Mg/Ca data. To account for this, the BWT, ice volume, and dw estimates are corrected for a change in the ?[CO32-] of deep waters on the basis of recently published work. Corrected BWT at Sites 1090 and 1265 show a ~1.5°C cooling coincident with Oi-1 and an average dw increase of ~0.75‰. The increase in ice volume during Oi-1 resulted in a ~70 m drop in global sea level and the development of an Antarctic ice sheet that was near modern size or slightly larger. STUDY NOTES: Data used in the graphs and diagrams used to make interpretations. Age in 1265 tuned to 1090 below 193.1 mcd. Provided Keywords: Mg/Ca isotopes, Eocene-Oligocene transition NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Pusz, A.E. Investigator : Thunell, R.C. Investigator : Miller, K.G. 2016-08-05 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/20406 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1265.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1090-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1090-chem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1265.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1090-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1090-chem.txt English https://www.ncdc.noaa.gov/paleo/study/20406 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1265.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1090-iso.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pusz2011/pusz2011-1090-chem.txt Pusz, A.E., R.C. Thunell, and K.G. Miller2011Deep water temperature, carbonate ion, and ice volume changes across the Eocene-Oligocene climate transitionPaleoceanography26PA220510.1029/2010PA001950 START YEAR: 36058360 cal yr BP * END YEAR: 32848700 cal yr BP 2.639333 -42.913687 8.899737 -28.835017