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Browsing by Author "Severinghaus, Jeffrey P."

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Browsing by Author "Severinghaus, Jeffrey P."

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  • Abrupt changes in atmospheric methane at the MIS 5b–5a transition 
    Grachev, Alexi M.; Brook, Edward J.; Severinghaus, Jeffrey P. (American Geophysical Union, 2007)
    New ice core analyses show that the prominent rise in atmospheric methane concentration at Dansgaard-Oeschger event 21 was interrupted by a century-long 20% decline, which was previously unrecognized. The reversal was fo ...
  • Ice stratigraphy at the Pakitsoq ice margin, West Greenland, derived from gas records 
    Schaefer, Hinrich; Petrenko, Vasilii V.; Brook, Edward J.; Severinghaus, Jeffrey P.; Reeh, Niels; Melton, Joe R.; Mitchell, Logan (International Glaciological Society, 2009-06)
    Horizontal ice-core sites, where ancient ice is exposed at the glacier surface, offer unique opportunities for paleo-studies of trace components requiring large sample volumes. Following previous work at the Pâkitsoq ice ...
  • In situ cosmogenic radiocarbon production and 2-D ice flow line modeling for an Antarctic blue ice area 
    Buizert, Christo; Petrenko, Vasilii V.; Kavanaugh, Jeffrey L.; Cuffey, Kurt M.; Lifton, Nathaniel A.; Brook, Edward J.; Severinghaus, Jeffrey P. (American Geophysical Union, 2012-05-24)
    Radiocarbon measurements at ice margin sites and blue ice areas can potentially be used for ice dating, ablation rate estimates and paleoclimatic reconstructions. Part of the measured signal comes from in situ cosmogenic ...
  • Instruments and Methods: A novel method for obtaining very large ancient air samples from ablating glacial ice for analyses of methane radiocarbon 
    Petrenko, Vasilii V.; Severinghaus, Jeffrey P.; Brook, Edward J.; Muhle, Jens; Headly, Melissa; Harth, Christina M.; Schaefer, Hinrich; Reeh, Niels; Weiss, Ray F.; Lowe, Dave; Smith, Andrew M. (International Glaciological Society, 2008-03)
    We present techniques for obtaining large (∼100 L STP) samples of ancient air for analysis of ¹⁴C of methane (¹⁴CH₄) and other trace constituents. Paleoatmospheric ¹⁴CH₄ measurements should constrain the fossil fraction ...
  • A New Method for Analyzing ¹⁴C of Methane in Ancient Air Extracted from Glacial Ice 
    Petrenko, Vasilii V.; Smith, Andrew M.; Brailsford, Gordon; Riedel, Katja; Hua, Quan; Lowe, Dave; Severinghaus, Jeffrey P.; Levchenko, Vladimir; Bromley, Tony; Moss, Rowena; Muhle, Jens; Brook, Edward J. (University of Arizona, 2008)
    We present a new method developed for measuring radiocarbon of methane (¹⁴CH₄) in ancient air samples extracted from glacial ice and dating 11,000–15,000 calendar years before present. The small size (~20 μg CH₄ carbon) ...
  • Relative timing and variability of atmospheric methane and GISP2 oxygen isotopes between 68 and 86 ka 
    Grachev, Alexi M.; Brook, Edward J.; Severinghaus, Jeffrey P.; Pisias, Nicklas G. (American Geophysical Union, 2009)
    The global biogeochemical cycle of methane has received wide attention because of methane's role as a greenhouse gas. Measurements of methane in air trapped in Greenland ice cores provide a high-resolution record of meth ...

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