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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:: Edward J. Brook,2 Logan Mitchell,2 Julia Rosen,2 Joseph R. McConnell,3 Kendrick Taylor,3 David Etheridge

Creator:: Jerome Chappellaz, Brook, Edward J., Thomas Blunier, Bruno Malaize, Blunier, Thomas, Chappellaz, Jerome, and Malaize, Bruno
Abstract:: The suggestion of climatic instability during the last interglacial period (Eem), based on the bottom 10% of the Greenland Ice core Project (GRIP) isotopic profile, has been questioned because the bottom record from the neighboring Greenland Ice Sheet Project 2 (GISP2) core (28 km away) is strikingly different over the...
Resource Type:: Article
Full Text:: . Johnsen, J. Jouzel, M. Leuenberger, D. Raynaud, T. Sowers, B. Stauffer, and M. Stievenard for fruitful

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:: trapped gases in ice cores Todd Sowers 1, Ed Brook 2,3, David Etheridge 4, Thomas Blunier 5, Andreas

Creator:: Mitchell, Logan E., Buizert, Christo, Brook, Edward J., Rhodes, Rachael H., and et al.
Abstract:: Interpretation of ice core trace gas records depends on an accurate understanding of the processes that smooth the atmospheric signal in the firn. Much work has been done to understand the processes affecting air transport in the open pores of the firn, but a paucity of data from air trapped...
Full Text:: would be large [e.g., Schwander and Stauffer, 1984; Stauffer et al., 1985]. We have no direct way to

Creator:: Sigl, Michael, Fudge, Tyler J., Winstrup, Mai, Cole-Dai, Jihong, Ferris, David, McConnell, Joseph R., Taylor, Ken C., Welten, Kees C., Woodruff, Thomas E., Adolphi, Florian, Bisiaux, Marion, Brook, Edward J., Buizert, Christo, Caffee, Marc W., Dunbar, Nelia W., Edwards, Ross, Geng, Lei, Iverson, Nels, Koffman, Bess, Layman, Lawrence, Maselli, Olivia J., McGwire, Kenneth, Muscheler, Raimund, Nishiizumi, Kunihiko, Pasteris, Daniel R., Rhodes, Rachael H., and Sowers, Todd A
Abstract:: We present the WD2014 chronology for the upper part (0–2850 m; 31.2 ka BP) of the West Antarctic Ice Sheet (WAIS) Divide (WD) ice core. The chronology is based on counting of annual layers observed in the chemical, dust and electrical conductivity records. These layers are caused by seasonal changes...
Full Text:: . Fudge3, Mai Winstrup3,a, Jihong Cole-Dai4, David Ferris5, Joseph R. McConnell1, Ken C. Taylor1, Kees C

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