USAP-DC

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South Pole Ice Core Methane Data and Gas Age Time Scale Data DOI: https://doi.org/10.15784/601329 Cite as Brook, E. J. (2020) "South Pole Ice Core Methane Data and Gas Age Time Scale" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601329. AMD - DIF Record(s) USAP-1643722_1 Abstract This data set contains measurements of atmospheric methane in the South Pole Ice core made at both Oregon State University and Penn State University, as well as a gas age time scale for the core. In both laboratories methane was measured using a melt-refreeze technique to liberate extracted air and using a gas chromatograph with flame ionization detection to quantify the methane concentration, by comparison to calibrated air standards. To construct the gas time scale abrupt changes in atmospheric methane during the glacial period and centennial methane variability during the Holocene were used to synchronize the South Pole gas record with analogous data from the West Antarctic Ice Sheet Divide ice core. Stratigraphic matching based on visual optimization was verified using an automated matching algorithm. The South Pole ice core recovers all expected changes in methane based on previous records. In combination with an existing ice age scale (Winski et al., 2019, Clim. Past, 15, 1793–1808) an independent estimate of the gas age-ice age difference is also provided. A full description of the data and gas age scale are provided in Epifanio et al., 2020 (Climate of the Past, 16, 2431-2444). Creator(s): Brook, Edward J. Date Created: 2020-06-03 Repository: USAP-DC (current) License: Creative Commons Attribution-NonCommercial v4.0 Generic [CC BY-NC 4.0] Spatial Extent(s) West: 180, East: 180, South: -90, North: -90 Award(s) NSF 1643722 Version: 1 Related Project(s) A High Resolution Atmospheric Methane Record from the South Pole Ice Core References Epifanio, J. A., Brook, E. J., Buizert, C., Edwards, J. S., Sowers, T. A., Kahle, E. C., … Kennedy, J. A. (2020). The SP19 chronology for the South Pole Ice Core – Part 2: gas chronology, Δage, and smoothing of atmospheric records. Climate of the Past, 16(6), 2431–2444. (doi:10.5194/cp-16-2431-2020) Keywords Antarctica Gas Chromatography Glaciers/ice Sheet Glaciology Ice Core Records Methane South Pole