Chilean Margin 30KYr Redox-Sensitive Metals Data Muratli, J.M.; Chase, Z.; Mix, A.C.; McManus, J.F. Muratli, J.M. Chase, Z. Mix, A.C. McManus, J.F. Meridional Overturning Circulation (MOC) earth science/paleoclimate/paleoceanography (depth,null,null,meter,null,paleoceanography,composited,null,N,null) earth science/paleoclimate/paleoceanography (aluminum,sediment,null,parts per million,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null) earth science/paleoclimate/paleoceanography (biogenic silica,sediment,one standard deviation,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (organic carbon,sediment,one standard deviation,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (rhenium,sediment,null,parts per billion,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/paleoceanography (biogenic silica,null,one standard deviation,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (organic carbon,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (organic carbon,null,null,gram per square centimeter per kiloyear,null,paleoceanography,averaged,null,N,null) earth science/paleoclimate/paleoceanography (aluminum,null,null,gram per square centimeter per kiloyear,null,paleoceanography,averaged,null,N,null) earth science/paleoclimate/paleoceanography (depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (rhenium,sediment,one standard deviation,parts per billion,null,paleoceanography,null,inductively-coupled plasma mass spectrometry,N,null) earth science/paleoclimate/paleoceanography (biogenic silica,sediment,null,weight percent,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (sedimentation rate,null,null,centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (biogenic silica,null,null,gram per square centimeter per kiloyear,null,paleoceanography,averaged,null,N,null) earth science/paleoclimate/paleoceanography (aluminum,null,one standard deviation,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (aluminum,sediment,one standard deviation,parts per million,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null) earth science/paleoclimate/paleoceanography (manganese,sediment,null,parts per million,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null) earth science/paleoclimate/paleoceanography (manganese,sediment,one standard deviation,parts per million,null,paleoceanography,null,inductively-coupled plasma atomic emission spectroscopy,N,null) earth science/paleoclimate/paleoceanography (organic carbon,null,one standard deviation,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean (ODP 1233>LATITUDE -41>LONGITUDE -74.45) (ODP1235>LATITUDE -36.159833>LONGITUDE -73.56633) (ODP1234>LATITUDE -36.219167>LONGITUDE -73.68167) Antarctic Intermediate Water is, at present, a water mass that brings oxygen to intermediate depths throughout the Southern Hemisphere oceans. Models have suggested that intermediate waters had higher concentrations of oxygen during the last glacial period, consistent with globally reduced denitrification and increased production of Antarctic Intermediate Water. However, some palaeoceanographic reconstructions have indicated that production decreased in the southeast Pacific Ocean at this time. Here we analyse the concentrations of Re and Mn, the sedimentary concentrations of which are controlled by the amount of dissolved oxygen at the sea floor, from three sediment cores located along the Chilean margin for the past 30,000 years. Our results from the cores, which bracket the present-day water-column extent of Antarctic Intermediate Water, show that the depth range of well-oxygenated Antarctic Intermediate Water increased off Chile during the Last Glacial Maximum. Dissolved oxygen content began to decrease approximately 17,000 years ago, coincident with rapid Antarctic warming and a poleward shift of the southern westerly winds. Our estimates of productivity from accumulation rates of organic carbon and opal do not co-vary with the seafloor oxygen variations, ruling out local control of seafloor oxygenation. We conclude that the data are best explained by a combination of increased oxygenation and increased flux of Antarctic Intermediate Water during the Last Glacial Maximum. STUDY NOTES: Sediment concentration of redox (oxidation-reduction reaction) sensitive metals (Re and Mn) from 3 cores along the Chilean Margin in the eastern South Pacific, interpreted as a proxy for sea floor oxygen concentration. Accumulation rates of organic carbon and opal are also included as productivity proxies. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Muratli, J.M. Investigator : Chase, Z. Investigator : Mix, A.C. Investigator : McManus, J.F. 2010-12-29 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10333 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010/muratli2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010/muratli2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010/muratli2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010/muratli2010.xls English https://www.ncdc.noaa.gov/paleo/study/10333 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010/muratli2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/muratli2010/muratli2010.xls Muratli, J.M., Z. Chase, A.C. Mix, and J. McManus. 2010. Increased glacial-age ventilation of the Chilean margin by Antarctic Intermediate Water. Nature Geoscience, Vol. 3, pp. 23-26, January 2010. Published online 13 December 2009. doi:10.1038/ngeo715 START YEAR: 30185 cal yr BP * END YEAR: 155 cal yr BP -74.45 -41 -73.56633 -36.159833