noaa-icecore-25530 Polar Ice Cores 3,000 Year Nitrous Oxide d15N and d18O Data Prokopiou, M.; Sapart, C.J.; Rosen, J.; Sperlich, P.; Blunier, T.; Brook, E.J.; van de Wal, R.S.W.; Röckmann, T. Polar Ice Cores 3,000 Year Nitrous Oxide d15N and d18O Data 2018-10-31 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25530 Investigator M. Prokopiou Investigator C.J. Sapart Investigator J. Rosen Investigator P. Sperlich Investigator T. Blunier Investigator E.J. Brook Investigator R.S.W. van de Wal Investigator T. Röckmann earth science paleoclimate ice cores delta 15N,nitrous oxide,unspecified margin of error,per mil AIR,null,ice cores,null,null,N,delta 15N alpha; 15N content of the central (α) nitrogen position earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,null,null,N,delta 15N alpha Toyoda scale; 15N content of the central (α) nitrogen position earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,null,null,N,delta 15N beta; 15N content of the terminal (β) nitrogen position earth science paleoclimate ice cores delta 18O,nitrous oxide,null,per mil VSMOW,null,ice cores,null,continuous-flow isotope ratio mass spectrometry,N,null earth science paleoclimate ice cores depth,null,null,millimeter,null,ice cores,null,null,N,null earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,null,null,N,null earth science paleoclimate ice cores sample identification,null,null,null,null,ice cores,null,null,C,site name earth science paleoclimate ice cores nitrous oxide,bulk atmosphere,one standard deviation,parts per billion,null,ice cores,null,null,N,null earth science paleoclimate ice cores nitrous oxide,bulk atmosphere,unspecified margin of error,nanomole per mole,null,ice cores,null,null,N,null earth science paleoclimate ice cores delta 15N,nitrous oxide,unspecified margin of error,per mil AIR,null,ice cores,null,null,N,delta 15N beta Toyoda scale; 15N content of the terminal (β) nitrogen position earth science paleoclimate ice cores delta 18O,nitrous oxide,null,per mil VSMOW,null,ice cores,corrected,continuous-flow isotope ratio mass spectrometry,N,gravity corrected earth science paleoclimate ice cores nitrous oxide,bulk atmosphere,null,nanomole per mole,null,ice cores,null,null,N,null earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,null,null,N,delta 15N alpha; 15N content of the central (α) nitrogen position earth science paleoclimate ice cores sample identification,null,null,null,null,ice cores,null,null,C,null earth science paleoclimate ice cores delta 15N,nitrous oxide,unspecified margin of error,per mil AIR,null,ice cores,null,null,N,null earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,null earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,null,continuous-flow isotope ratio mass spectrometry,N,null earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,corrected,continuous-flow isotope ratio mass spectrometry,N,gravity corrected delta 15N beta; 15N content of the terminal (β) nitrogen position earth science paleoclimate ice cores delta 18O,nitrous oxide,null,per mil VSMOW,null,ice cores,null,null,N,null earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,null,continuous-flow isotope ratio mass spectrometry,N,delta 15N alpha; 15N content of the central (α) nitrogen position earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,null,continuous-flow isotope ratio mass spectrometry,N,delta 15N beta; 15N content of the terminal (β) nitrogen position earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,corrected,continuous-flow isotope ratio mass spectrometry,N,gravity corrected delta 15N alpha; 15N content of the central (α) nitrogen position earth science paleoclimate ice cores delta 15N,nitrous oxide,unspecified margin of error,per mil AIR,null,ice cores,null,null,N,delta 15N beta; 15N content of the terminal (β) nitrogen position earth science paleoclimate ice cores gas age,null,null,year Common Era,null,ice cores,null,null,N,null earth science paleoclimate ice cores nitrous oxide,bulk atmosphere,null,parts per billion,null,ice cores,null,null,N,null earth science paleoclimate ice cores delta 15N,nitrous oxide,null,per mil AIR,null,ice cores,corrected,continuous-flow isotope ratio mass spectrometry,N,gravity corrected earth science paleoclimate ice cores delta 18O,nitrous oxide,unspecified margin of error,per mil VSMOW,null,ice cores,null,null,N,null earth science paleoclimate ice core nitrogen isotopes earth science paleoclimate ice core oxygen isotopes geoscientificInformation -689 AD 2008 AD 2639 cal yr BP -58 cal yr BP Complete -81.65 77.45 -148.82 -37.63 621 2917 Continent North America Greenland NEEM>LATITUDE 77.45>LONGITUDE -51.06 Continent North America Greenland GRIP>LATITUDE 72.58>LONGITUDE -37.63 Continent Antarctica Siple Dome>LATITUDE -81.65>LONGITUDE -148.82 Continent North America Greenland NGRIP>LATITUDE 75.1>LONGITUDE -42.33 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 M. Prokopiou, C.J. Sapart, J. Rosen, P. Sperlich, T. Blunier, E. Brook, R.S.W. van de Wal, T. Röckmann 2018 Journal of Geophysical Research: Atmospheres 123 18 10757-10773 10.1029/2018JD029008 https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018JD029008

Nitrous oxide (N2O) is a strong greenhouse gas whose mole fraction in the atmosphere has increased over the industrial period. We present a new set of isotope measurements of N2O in air extracted from ice cores covering the last 3,000 years. For the preindustrial (PI) atmosphere, we find an average N2O mole fraction of (267 ± 1) nmol/mol and average tropospheric N2O isotopic values of d15NavPI = (9.5 ± 0.1)permil, d18OPI = (47.1 ± 0.2)permil, d15NalphaPI = (17.8 ± 0.4)permil, and d15NBetaPI = (1.2 ± 0.4)permil. From PI to modern times all isotope signatures decreased with a total change of d15Nav = (-2.7 ± 0.2)permil, d18O = (-2.5 ± 0.4)permil, d15Nalpha = (-2.0 ± 0.7)permil, and d15NBeta (-3.5 ± 0.7)permil. Interestingly, the temporal evolution is not the same for d15Nav and d18O. d18O trends are relatively larger during the early part, and d15Nav trends are larger during the late part of the industrial period, implying a decoupling of sources over the industrial period. Using a mass balance model, we determined the isotopic composition of the total average N2O source. Assuming that the total present source is the sum of a constant natural source and an increasing anthropogenic source, this anthropogenic source has an isotopic signature of d15Navsource,anthrop = (-15.0 ± 2.6)permil, d18Osource,anthrop = (30.0 ± 2.6)permil, d15Nalphasource,anthrop = (-4.5 ± 1.7)permil, and d15NBetasource,anthrop = (-24.0 ± 8.4)permil. The 15N site preference of the source has increased since PI times, which is indicative of a relative shift from denitrification to nitrification sources, consistent with agricultural emissions playing a major role in the N2O increase. STUDY NOTES: Ice core nitrogen and oxygen isotope (d15N and d18O) of nitrous oxide (N2O) data from polar ice cores for the past 3,000 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neem2018n2o-iso.txt NOAA Template File; NEEM and EUROCORE N2O Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/neemfirn2018n2o-iso.txt NOAA Template File; NEEM Firn Core N2O Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/ngrip2018n2o-iso.txt NOAA Template File; NGRIP and Berkner Island N2O Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/gases/grip2018n2o.txt NOAA Template File; GRIP and EUROCORE N2O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/antarctica/siple/siple2018n2o-iso.txt NOAA Template File; Siple Dome N2O Isotope Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11