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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

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

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
Full Text:: Petrenko.fm RADIOCARBON, Vol 50, Nr 1, 2008, p 53–73 © 2008

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

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:: the Last Deglaciation Buizert, C., Gkinis, V., Severinghaus, J. P., He, F., Lecavalier, B. S

Precise interpolar phasing of abrupt climate change during the last ice age

Creator:: Buizert, Christo, Adrian, Betty, Ahn, Jinho, Albert, Mary, Alley, Richard B., Baggenstos, Daniel, Bauska, Thomas K., Bay, Ryan C., Bencivengo, Brian B., Bentley, Charles R., Brook, Edward J., Chellman, Nathan J., Clow, Gary D., Cole-Dai, Jihong, Conway, Howard, Cravens, Eric, Cuffey, Kurt M., Dunbar, Nelia W., Edwards, Jon S., Fegyveresi, John M., Ferris, Dave G., Fitzpatrick, Joan J., Fudge, T. J., Gibson, Chris J., Gkinis, Vasileios, Goetz, Joshua J., Gregory, Stephanie, Hargreaves, Geoffrey M., Iverson, Nels, Johnson, Jay A., Jones, Tyler R., Kalk, Michael L., Kippenhan, Matthew J., Koffman, Bess G., Kreutz, Karl, Kuhl, Tanner W., Lebar, Donald A., Lee, James E., Marcott, Shaun A., Markle, Bradley R., Maselli, Olivia J., McConnell, Joseph R., McGwire, Kenneth C., Mitchell, Logan E., Mortensen, Nicolai B., Neff, Peter D., Nishiizumi, Kunihiko, Nunn, Richard M., Orsi, Anais J., Pasteris, Daniel R., Pedro, Joel B., Pettit, Erin C., Price, P. Buford, Priscu, John C., Rhodes, Rachael H., Rosen, Julia L., Schauer, Andrew J., Schoenemann, Spruce W., Sendelbach, Paul J., Severinghaus, Jeffrey P., Shturmakov, Alexander J., Sigl, Michael, Slawny, Kristina R., Souney, Joseph M., Sowers, Todd A., Spencer, Matthew K., Steig, Eric J., Taylor, Kendrick C., Twickler, Mark S., Vaughn, Bruce H., Voigt, Donald E., Waddington, Edwin D., Welten, Kees C., Wendricks, Anthony W., White, James W. C., Winstrup, Mai, Wong, Gifford J., and Woodruff, Thomas E.
Abstract:: The last glacial period exhibited abrupt Dansgaard–Oeschger climatic oscillations, evidence of which is preserved in a variety of Northern Hemisphere palaeoclimate archives¹. Ice cores show that Antarctica cooled during the warm phases of the Greenland Dansgaard–Oeschger cycle and vice versa[superscript 2,3], suggesting an interhemispheric redistribution of heat through a mechanism...
Resource Type:: Article
Full Text:: variations are moderated by the large thermalmass of the 3 0 A P R I L 2 0 1 5 | V O L 5 2 0 | N A T U R E

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

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

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

Greenland Temperature Response to Climate Forcing during the Last Deglaciation

Precise interpolar phasing of abrupt climate change during the last ice age

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