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Concentration and isotopic composition of atmospheric N2O over the last century Data DOI: https://doi.org/10.15784/601693 Cite as Ghosh, S., Ahn, J., Buizert, C., Etheridge, D., Joong Kim, S., Langenfelds, R., et al. (2023) "Concentration and isotopic composition of atmospheric N2O over the last century" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601693. AMD - DIF Record(s) USAP-1643669_1 Abstract We have reconstructed the atmospheric N2O mole fraction and its isotopic composition by combining data from ice cores, firn air, and atmospheric samples. The mole fraction reconstruction extends back to 1000 CE using ice cores, firn air, and atmospheric sampling; and the isotopic reconstruction extends back to 1900 CE using only firn air data. We have incorporated both newly measured and previously published data. We present new data for the mole fraction, d15Nbulk, d18O, and d15NSP values from the Styx (East Antarctica) firn air, and mole fraction from the North Greenland Eemian Ice drilling Project (NEEM) firn air. We have used published records from the Styx and NEEM ice cores, direct atmospheric measurements from the NOAA global sampling network, and firn air data, giving a total of 11 sites for N2O mole fraction, 12 sites for d15Nbulk, 11 sites for d18O, and 8 sites for d15NSP values. Creator(s): Ghosh, Sambit; Toyoda, Sakae ; Buizert, Christo ; Etheridge, David; Langenfelds, Ray L ; Yoshida, Naohiro ; Joong Kim, Seong; Ahn, Jinho Date Created: 2023-05-22 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: -180, East: 180, South: -90, North: -67 Temporal Extent(s) Start: 1900-01-01 - End: 2021-12-31 Award(s) NSF 1643716 Version: 1 Related Project(s) Collaborative Research: Reconstructing Carbon-14 of Atmospheric Carbon Monoxide from Law Dome, Antarctica to Constrain Long-Term Hydroxyl Radical Variability Keywords Antarctic Antarctica Anthropogenic Emission Atmosphere Greenhouse Gas Greenland Ice Core Data Nitrification And Denitrification Processes Nitrous Oxide Site-Specific 15N Isotopomer Styx Glacier