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High-precision dual-inlet IRMS measurements of the stable isotopes of CO₂ and the N₂O/CO₂ ratio from polar ice core samples

Creator:: Bauska, T. K., Brook, E. J., Mix, A. C., Ross, A., and Brook, Edward J.
Abstract:: An important constraint on mechanisms of past carbon cycle variability is provided by the stable isotopic composition of carbon in atmospheric carbon dioxide (δ¹³C-CO₂) trapped in polar ice cores, but obtaining very precise measurements has proven to be a significant analytical challenge. Here we describe a new technique to determine...
Resource Type:: Article
Full Text:: dual-inlet IRMS measurements of the stable isotopes of CO₂ and the N₂O/CO₂ ratio from polar ice core

Gases in ice cores

Creator:: Bender, Michael, Sowers, Todd, and Brook, Edward J.
Abstract:: Air trapped in glacial ice offers a means of reconstructing variations in the concentrations of atmospheric gases over time scales ranging from anthropogenic (last 200 yr) to glacial/interglacial (hundreds of thousands of years). In this paper, we review the glaciological processes by which air is trapped in the ice and...
Resource Type:: Article
Full Text:: . Reconstructions of the Anthropogenic Transient from Ice Core and Firn Air Chemistry CO2. The most extensive study

CO₂ diffusion in polar ice: observations from naturally formed CO₂ spikes in the Siple Dome (Antarctica) ice core

Creator:: Ahn, Jinho, Headly, Melissa, Wahlen, Martin, Brook, Edward J., Mayewski, Paul A., and Taylor, Kendrick C.
Abstract:: One common assumption in interpreting ice-core CO₂ records is that diffusion in the ice does not affect the concentration profile. However, this assumption remains untested because the extremely small CO₂ diffusion coefficient in ice has not been accurately determined in the laboratory. In this study we take advantage of high...
Resource Type:: Article
Full Text:: samples from the Siple Dome ice core show a gradual decrease of CO2 away from two refrozen melt layers

An interlaboratory comparison of techniques for extracting and analyzing trapped gases in ice cores

Creator:: Sowers, Todd, Brook, Edward J., Etheridge, David, Blunier, Thomas, Fuchs, Andreas, Leuenberger, Markus, Chappellaz, Jerome, Barnola, Jean Marc, Wahlen, Martin, Deck, Bruce, and Weyhenmeyer, Connie
Abstract:: We undertook an interlaboratory comparison of techniques used to extract and analyze trapped gases in ice cores. The intercomparison included analyses of standard reference gases and samples of ice from the Greenland Ice Sheet Project 2 (GISP2) site. Concentrations of CO₂, CH₄, the δ¹⁸O of O₂, the δ¹⁵N of N₂,...
Resource Type:: Article
Full Text:: reference gases and samples of ice from the Greenland Ice Sheet Project 2 (GISP2) site. Concentrations of

Atmospheric CO₂ over the last 1000 years: A high-resolution record from the West Antarctic Ice Sheet (WAIS) Divide ice core

Creator:: Ahn, Jinho, Brook, Edward J., Mitchell, Logan, Rosen, Julia, McConnell, Joseph R., Taylor, Kendrick, Etheridge, David, and Rubino, Mauro
Abstract:: We report a decadally resolved record of atmospheric CO₂ concentration for the last 1000 years, obtained from the West Antarctic Ice Sheet (WAIS) Divide shallow ice core. The most prominent feature of the pre-industrial period is a rapid ∼7 ppm decrease of CO₂ in a span of ∼20–50 years at...
Resource Type:: Article
Full Text:: ppm) among the high-precision CO2 records from the Law Dome, EPICA Dronning Maud Land and WAIS Divide

Greenland Temperature Response to Climate Forcing during the Last Deglaciation

Creator:: Buizert, Christo, Gkinis, Vasileios, Severinghaus, Jeffrey P., He, Feng, Lecavalier, Benoit S., Kindler, Philippe, Leuenberger, Markus, Carlson, Anders E., Vinther, Bo, Masson-Delmotte, Valerie, White, James W. C., Liu, Zhengyu, Otto-Bliesner, Bette, and Brook, Edward J.
Abstract:: Greenland ice core water isotopic composition (δ¹⁸O) provides detailed evidence for abrupt climate changes, but is by itself insufficient for quantitative reconstruction of past temperatures and their spatial patterns. We investigate Greenland temperature evolution during the last deglaciation using independent reconstructions from three ice cores and simulations with a coupled...
Resource Type:: Article
Full Text:: technique, and analyzed using dual inlet isotope ratio mass spectrometry (IRMS). Routine analytical

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:: sample profiles and samples from corners of the ice areas cut were taken for laboratory analyses of d15N

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:: successful 81Kr radiometric dating of polar ice using air extracted from four ice samples from the Taylor

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:: and refrozen as for the actual samples, followed by measurements. [18] Uncertainty of the ice core

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:: sampling transects. From GPS measurements, the end-points of the gas and the ice profiles appear to be

ScholarsArchive@OSU

High-precision dual-inlet IRMS measurements of the stable isotopes of CO₂ and the N₂O/CO₂ ratio from polar ice core samples

Gases in ice cores

CO₂ diffusion in polar ice: observations from naturally formed CO₂ spikes in the Siple Dome (Antarctica) ice core

An interlaboratory comparison of techniques for extracting and analyzing trapped gases in ice cores

Atmospheric CO₂ over the last 1000 years: A high-resolution record from the West Antarctic Ice Sheet (WAIS) Divide ice core

Greenland Temperature Response to Climate Forcing during the Last Deglaciation

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

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

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

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

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