Eastern South Pacific GeoB 7139-2 70KYr d15N Data De Pol-Holz, R.; Ulloa, O.; Lamy, F.; Dezileau, L.; Sabatier, P.; Hebbeln, D. De Pol-Holz, R. Ulloa, O. Lamy, F. Dezileau, L. Sabatier, P. Hebbeln, D. earth science/paleoclimate/paleoceanography (nitrogen,sediment,null,weight percent,null,paleoceanography,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 15N,sediment,null,per mil AIR,null,paleoceanography,null,isotope ratio mass spectrometry,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean (GeoB7139-2>LATITUDE -30.2>LONGITUDE -71.9832) We present high-resolution bulk sedimentary d15N data from the southern edge of the present-day oxygen minimum zone of the eastern South Pacific. The record is interpreted as representing changes in water column nitrogen removal during the last 70,000 years. We found significant fluctuations in the isotopic signal that suggest major reorganizations of the oxygen minimum zone at millennial timescales. These fluctuations were not related to other millennial-scale changes like the Northern Hemisphere's Dansgaard-Oeschger climate swings or local changes in primary productivity, so appear to be dictated by the Southern Hemisphere's climate rhythm. This is preliminarily corroborated by an overall agreement between our d15N data and the sedimentary proxy of ice sheet dynamics in Patagonia, which is in turn correlated with surface water properties at the midlatitude subduction region of the eastern South Pacific intermediate waters. Finally, potential implications on late Quaternary changes in atmospheric CO2 concentrations are discussed. STUDY NOTES: High-resolution (mean ~83 years) bulk sedimentary nitrogen isotope and percent nitrogen data from GeoB core 7139-2, coastal Chile, eastern South Pacific. Nitrogen isotopes measured by EA-IRMS at the stable Isotope facility of the University of Concepcion, Chile. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : De Pol-Holz, R. Investigator : Ulloa, O. Investigator : Lamy, F. Investigator : Dezileau, L. Investigator : Sabatier, P. Investigator : Hebbeln, D. 2010-08-16 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10494 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/depol-holz2007/depol-holz2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/depol-holz2007/depol-holz2007.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/depol-holz2007/depol-holz2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/depol-holz2007/depol-holz2007.txt English https://www.ncdc.noaa.gov/paleo/study/10494 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/depol-holz2007/depol-holz2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/depol-holz2007/depol-holz2007.txt De Pol-Holz, R., O. Ulloa, F. Lamy, L. Dezileau, P. Sabatier, and D. Hebbeln. 2007. Late Quaternary variability of sedimentary nitrogen isotopes in the eastern South Pacific Ocean. Paleoceanography, 22, PA2207, doi:10.1029/2006PA001308 START YEAR: 70090 cal yr BP * END YEAR: 840 cal yr BP -71.9832 -30.2 -71.9832 -30.2