Index Catalog // ScholarsArchive@OSU

Abrupt changes in atmospheric methane at the MIS 5b–5a transition

Creator:: Grachev, Alexi M., Brook, Edward J., and Severinghaus, Jeffrey P.
Abstract:: 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 found in a new ∼100-year resolution study of methane in the GISP2 ice core, encompassing the beginning of D-O...
Resource Type:: Article
Full Text:: 5b–5a transition Alexi M. Grachev,1 Edward J. Brook,1 and Jeffrey P. Severinghaus2 Received 24

Relative timing and variability of atmospheric methane and GISP2 oxygen isotopes between 68 and 86 ka

Creator:: Grachev, Alexi M., Brook, Edward J., Severinghaus, Jeffrey P., and Pisias, Nicklas G.
Abstract:: 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 methane levels in the atmosphere over the past ~100 ka, providing clues about what controls the methane...
Resource Type:: Article
Full Text:: methane and GISP2 oxygen isotopes between 68 and 86 ka Alexi M. Grachev,1,2 Edward J. Brook,1 Jeffrey P

In situ cosmogenic radiocarbon production and 2-D ice flow line modeling for an Antarctic blue ice area

Creator:: Buizert, Christo, Petrenko, Vasilii V., Kavanaugh, Jeffrey L., Cuffey, Kurt M., Lifton, Nathaniel A., Brook, Edward J., and Severinghaus, Jeffrey P.
Abstract:: 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 ¹⁴C production in ice, and this component must be well understood before useful information can be extracted...
Resource Type:: Article
Full Text:: Kurt M. Cuffey,5 Nathaniel A. Lifton,6 Edward J. Brook,7 and Jeffrey P. Severinghaus8 Received 13 May

Atmospheric methane during the last four glacial-interglacial cycles: Rapid changes and their link with Antarctic temperature

Creator:: Delmotte, M., Chappellaz, J., Brook, Edward J., Yiou, P., Barnola, J. M., Goujon, C., Raynaud, D., and Lipenkov, V. I.
Abstract:: Atmospheric methane (CH₄) recorded in Antarctic ice cores represents the closest ice proxy available for Greenland temperature changes beyond times when Greenland climate records are available. The record over four climatic cycles from the Vostok ice core offers the opportunity to study the phase relationship between Greenland and Antarctic climate...
Resource Type:: Article
Full Text:: E. Brook,3 P. Yiou,4 J. M. Barnola,1 C. Goujon,1 D. Raynaud,1 and V. I. Lipenkov5 Received 4

Ice stratigraphy at the Pakitsoq ice margin, West Greenland, derived from gas records

Creator:: Schaefer, Hinrich, Petrenko, Vasilii V., Brook, Edward J., Severinghaus, Jeffrey P., Reeh, Niels, Melton, Joe R., and Mitchell, Logan
Abstract:: 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 margin in West Greenland, we use a combination of geochemical parameters measured in the ice matrix (δ¹⁸O[subscript ice]) and...
Resource Type:: Article
Full Text:: , derived from gas records Hinrich SCHAEFER,1* Vasilii V. PETRENKO,2y Edward J. BROOK,1 Jeffrey P

Geochemical proxies of North American freshwater routing during the Younger Dryas cold event

Creator:: Carlson, Anders E., Clark, Peter U., Haley, Brian A., Klinkhammer, Gary P., Simmons, Kathleen, Brook, Edward J., and Meissner, Katrin J.
Abstract:: The Younger Dryas cold interval represents a time when much of the Northern Hemisphere cooled from ≈12.9 to 11.5 kiloyears B.P. The cause of this event, which has long been viewed as the canonical example of abrupt climate change, was initially attributed to the routing of freshwater to the St....
Resource Type:: Article
Full Text:: during the Younger Dryas cold event Anders E. Carlson*†, Peter U. Clark*, Brian A. Haley‡, Gary P

Radiometric ⁸¹Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica

Creator:: Buizert, Christo, Baggenstos, Daniel, Jiang, Wei, Purtschert, Roland, Petrenko, Vasilii V., Lu, Zheng-Tian, Mueller, Peter, Lee, James, Severinghaus, Jeffrey P., and Brook, Edward J.
Abstract:: We present the first successful ⁸¹Kr-Kr radiometric dating of ancient polar ice. Krypton was extracted from the air bubbles in four ~350 kg polar ice samples from Taylor Glacier in the McMurdo Dry Valleys, Antarctica, and dated using Atom Trap Trace Analysis (ATTA). The ⁸¹Kr radiometric ages agree with independent...
Resource Type:: Article
Full Text:: , Zheng-Tian Luc,f, Peter Müllerc, Tanner Kuhlg, James Leea, Jeffrey P. Severinghausb and Edward J. Brooka

A New Method for Analyzing ¹⁴C of Methane in Ancient Air Extracted from Glacial Ice

Creator:: 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, and Brook, Edward J.
Abstract:: 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), low CH₄ concentrations ([CH₄], 400–800 parts per billion [ppb]), high carbon monoxide concentrations ([CO]), and low...
Resource Type:: Article

Instruments and Methods: A novel method for obtaining very large ancient air samples from ablating glacial ice for analyses of methane radiocarbon

Creator:: 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, and Smith, Andrew M.
Abstract:: 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 of past methane budgets, as well as provide a definitive test of methane clathrate involvement in large and...
Resource Type:: Article
Full Text:: Jeffrey P. SEVERINGHAUS,1 Edward J. BROOK,2 Jens MÜHLE,1 Melissa HEADLY,1 Christina M. HARTH,1 Hinrich

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

Creator:: Rasmussen, S. O., Abbott, P. M., Blunier, T., Bourne, A. J., Brook, Edward J., Buchardt, S. L., Buizert, Christo, Chappellaz, J., Clausen, H. B., Cook, E., Dahl-Jensen, D., Davies, S. M., Guillevic, M., Kipfstuhl, S., Laepple, T., Seierstad, I. K., Severinghaus, J. P., Steffensen, J. P., Stowasser, C., Svensson, A., Vallelonga, P., Vinther, B. M., Wilhelms, F., and Winstrup, M.
Abstract:: A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring the annual layer counted Greenland Ice Core Chronology 2005 (GICC05) and its model extension (GICC05modelext) from the NGRIP core to the NEEM core using 787 match points of mainly volcanic origin identified...
Resource Type:: Article
Full Text:: A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core S. O. Rasmussen1, P

ScholarsArchive@OSU

Abrupt changes in atmospheric methane at the MIS 5b–5a transition

Relative timing and variability of atmospheric methane and GISP2 oxygen isotopes between 68 and 86 ka

In situ cosmogenic radiocarbon production and 2-D ice flow line modeling for an Antarctic blue ice area

Atmospheric methane during the last four glacial-interglacial cycles: Rapid changes and their link with Antarctic temperature

Ice stratigraphy at the Pakitsoq ice margin, West Greenland, derived from gas records

Geochemical proxies of North American freshwater routing during the Younger Dryas cold event

Radiometric ⁸¹Kr dating identifies 120,000-year-old ice at Taylor Glacier, Antarctica

A New Method for Analyzing ¹⁴C of Methane in Ancient Air Extracted from Glacial Ice

Instruments and Methods: A novel method for obtaining very large ancient air samples from ablating glacial ice for analyses of methane radiocarbon

A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core

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