USAP-DC

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Allan Hills CMC3 ice core d18Oatm, d15N, dO2/N2, dAr/N2, d40/36Ar, d40/38Ar 2021 & 2022 Data DOI: https://doi.org/10.15784/601620 Cite as Severinghaus, J. P. (2022) "Allan Hills CMC3 ice core d18Oatm, d15N, dO2/N2, dAr/N2, d40/36Ar, d40/38Ar 2021 & 2022" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601620. AMD - DIF Record(s) USAP-1745007_1 Abstract These data cover the penultimate glacial period (MIS 6) and parts of MIS5, in Allan Hills ice. The d18Oatm data are useful for dating the core, and the 15N is useful for inferring firn thickness. Importantly, the data have only been corrected for gas loss using published methods (i.e. Baggenstos et al. 2017), but not for recently recognized (and unpublished) effects of declining contemporary atmospheric O2/N2 due to fossil fuel burning. These changes unfortunately affect the La Jolla Air standard gas O2/N2 ratio that is used in our lab to make the measurements. Users of this data are encouraged to contact Jeff Severinghaus for help in making these novel corrections to the standard gas. Creator(s): Severinghaus, Jeffrey P. Date Created: 2022-11-22 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: 159.3562, East: 159.3562, South: -76.73243, North: -76.73243 Award(s) NSF 1744832 Version: 1 Related Project(s) Collaborative research: Snapshots of Early and Mid-Pleistocene Climate and Atmospheric Composition from the Allan Hills Blue Ice Area Keywords 18O Allan Hills Allan Hills Blue Ice Antarctica Blue Ice Delta 15N Delta 18O Dole Effect Dole Effect Firn Thickness Glaciers/ice Sheet Glaciology Ice Core Chronology Ice Core Records