noaa-ocean-17916 Eastern Tropical Pacific ODP1242 2.3Ma d15N Data Robinson, R.S.; Etourneau, J.; Martinez, P.; Schneider, R.R. Eastern Tropical Pacific ODP1242 2.3Ma d15N Data 2015-01-27 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17916 Investigator R.S. Robinson Investigator J. Etourneau Investigator P. Martinez Investigator R.R. Schneider earth science paleoclimate paleoceanography age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography delta 15N,sediment,null,per mil AIR,null,paleoceanography,averaged,null,N,null earth science paleoclimate paleoceanography nitrogen,sediment,null,percent,null,paleoceanography,averaged,null,N,null earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean nitrogen isotopes geoscientificInformation biogeochemical cycles 2327970 cal yr BP 990 cal yr BP Complete 7.85583 7.85583 -83.60694 -83.60694 -1364 -1364 Ocean Pacific Ocean Eastern Pacific Ocean ODP1242>LATITUDE 7.85583>LONGITUDE -83.60694 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Rebecca S. Robinson, Johan Etourneau, Philippe M. Martinez, Ralph Schneider 2014 Earth and Planetary Science Letters 389 52-61 10.1016/j.epsl.2013.12.022 http://www.sciencedirect.com/science/article/pii/S0012821X13007280

Bioavailable nitrogen is removed from the oceans in oxygen-deficient benthic and pelagic environments by denitrification. Future warming is predicted to reduce ocean oxygenation and to cause hypoxic regions to expand, potentially accelerating denitrification. A compilation of high-resolution sedimentary nitrogen isotope (dN15) records from the eastern tropical Pacific, North Pacific, and the Arabian Sea, and a global multi-site survey are presented as evidence for weak pelagic denitrification at the end of the Pliocene warm period. Mean dN15 values increased in the major oxygen minimum zones (OMZs) between 2.1 and 1.5 Ma. Pelagic denitrification strengthened during a period of long term global cooling, despite solubility driven increases in initial oxygen contents of Antarctic intermediate and Subantarctic mode waters ventilating the OMZs. This trend is opposite to the predicted mean trend for a cooling ocean as well as to the observed glacial-interglacial variation. Several alternatives to explain the shift are proposed, including a rise in net respiration, a progressive increase in the ventilation age of the deep ocean associated with million year scale, secular cooling, and a shoaling of the remotely ventilated thermocline to shallow depths corresponding to the zone of peak subsurface respiration. Given no evidence for a net increase in production, we assert that large-scale, climate-driven changes in ocean circulation regulate long timescale variations in the extent of pelagic denitrification. Additional data and modeling are required to fully explain the observations. STUDY NOTES: Nitrogen isotope (d15N) and percent Nitrogen data from Eastern Tropical Pacific Ocean Drilling Program core ODP1242 for the Pleistocene and Holocene (past 2.3 million years).

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/robinson2014/robinson2014.txt Data File; ODP1242 d15N and %N Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11