Southern Ocean Middle Eocene to Early Oligocene Paleoceanographic Data Anderson, L.D.; Delaney, M.L. Anderson, L.D. Delaney, M.L. earth science/paleoclimate/paleoceanography (barium excess,sediment,null,micromole per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (aluminum/titanium,sediment,null,dimensionless,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (manganese,sediment,null,micromole per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (biogenic silica,sediment,null,millimole per square centimeter per kiloyear,null,paleoceanography,null,null,N,mass accumulation rate) earth science/paleoclimate/paleoceanography (phosphorus,sediment,null,micromole per gram,null,paleoceanography,null,null,N,reactive) earth science/paleoclimate/paleoceanography (calcium,sediment,null,millimole per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (silicon dioxide,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (mineral matter,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (barium,sediment,null,micromole per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (barium excess,sediment,null,micromole per square centimeter per kiloyear,null,paleoceanography,null,null,N,accum. rate) earth science/paleoclimate/paleoceanography (phosphorus,sediment,null,micromole per gram,null,paleoceanography,null,null,N,detrital phosphorus) earth science/paleoclimate/paleoceanography (phosphorus,sediment,null,unspecified unit,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,millimole per square centimeter per kiloyear,null,paleoceanography,null,null,N,accum. rate) earth science/paleoclimate/paleoceanography (calcium carbonate,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (uranium,sediment,null,nanomole per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (aluminum,sediment,null,parts per million,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (titanium,sediment,null,micromole per gram,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (phosphorus,sediment,null,micromole per gram,null,paleoceanography,null,null,N,total digestion) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 1090>LATITUDE -42.908333>LONGITUDE 8.9) The Agulhas Ridge, off the tip of Africa between the Atlantic and Indian Oceans, is ideally located to capture the evolution of Paleogene-early Neogene circulation patterns associated with global cooling. Multiproxy records of productivity (biogenic barium (Baex), opal, CaCO3 mass accumulation rates (MARs)), nutrient and organic carbon burial (reactive phosphorus (Pr) MARs), and redox state of deep waters (U enrichment) from Ocean Drilling Program (ODP) Site 1090 reflect hydrographic shifts in this region between the middle Eocene and early Oligocene (?39–33 Ma). Several peaks in increased export productivity and burial of organic matter occurred within the late Eocene (?36.5, ?34, and ?33.7 Ma), which along with surface hydrologic conditions favoring opaline organisms over calcareous organisms could have aided in the draw down of pCO2 to a threshold level that facilitated large ice sheet development on Antarctica in the earliest Oligocene. Our multiproxy approach illustrates the importance of vertical as well as spatial hydrographic reorganization in amplifying or driving climatic cooling of the middle Eocene to early Oligocene by facilitating increases in the relative or absolute burial of organic carbon. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Anderson, L.D. Investigator : Delaney, M.L. 2005-01-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/2627 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1090-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/anderson2005 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1090-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/anderson2005 English https://www.ncdc.noaa.gov/paleo/study/2627 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1090-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/anderson2005 Anderson, L.D. and M.L. Delaney. 2005. Middle Eocene to early Oligocene paleoceanography from Agulhas Ridge, Southern Ocean (Ocean Drilling Program Leg 177, Site 1090). Paleoceanography 20, PA1013. doi:10.1029/2004PA001043 START YEAR: 40589788 14C yr BP * END YEAR: 33065034 14C yr BP 8.9 -42.908333 8.9 -42.908333