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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:: of the stable isotopes of CO₂ and the N₂O / CO₂ ratio from polar ice core samples High-precision

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:: CH₄ and δ¹⁸O of O₂

Creator:: Ahn, Jinho and Brook, Edward J.
Abstract:: Using new and existing ice core CO₂ data from 65 ∼ 30 ka a new chronology for CO₂ is established and synchronized with Greenland ice core records to study how high latitude climate change and the carbon cycle were linked during the last glacial period. Atmospheric CO₂ rose several thousand...
Resource Type:: Article
Full Text:: ., 2004; Severinghaus et al., 1998; Severinghaus and Brook, 1999; Severinghaus et al., 2003]. [3] D-O

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:: of the D-O events on methane emissions due to changes in temperature and rainfall [Brook et al., 2000

Creator:: Ahn, Jinho, Brook, Edward J., and Buizert, Christo
Abstract:: Atmospheric CO₂ records for the centennial scale cooling event 8200 years ago (8.2 ka event) may help us understand climate-carbon cycle feedbacks under interglacial conditions, which are important for understanding future climate, but existing records do not provide enough detail. Here we present a new CO₂ record from the Siple...
Full Text:: 535 540 Depth (m) C O 2 (p pm ) 1/19-1/29 3/3-3/26 4/13-4/15 3 Figure S2

Creator:: Ahn, Jinho, Brook, Edward J., and Buizert, Christo
Abstract:: Atmospheric CO₂ records for the centennial scale cooling event 8200 years ago (8.2 ka event) may help us understand climate-carbon cycle feedbacks under interglacial conditions, which are important for understanding future climate, but existing records do not provide enough detail. Here we present a new CO₂ record from the Siple...
Full Text:: . Brook, and C. Buizert (2014), Response of atmospheric CO₂ to the abrupt cooling event 8200 years ago

Creator:: Schmittner, Andreas, Brook, Edward J., and Ahn, Jinho
Abstract:: A coupled climate-carbon cycle model and ice core CO2 data from the last glacial period are used to explore the impact of changes in ocean circulation on atmospheric CO2 concentrations on millennial time scales. In the model, stronger wind driven circulation increases atmospheric CO2. Changes in the buoyancy driven deep...
Resource Type:: Part of Book
Full Text:: , Oregon, USA. Edward J. Brook and Jinho Ahn Department of Geosciences, Oregon State University

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:: . Gases in ice cores MICHAEL BENDER*, TODD SOWERS†, AND EDWARD BROOK*‡ *Graduate School of Oceanography

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:: during D-O events and at deglaciation [Chappellaz et al., 1993; Blunier and Brook, 2001]. Gas isotopes

Creator:: Suwa, Makoto, von Fischer, Joseph C., Bender, Michael L., Landais, Amaelle, and Brook, Edward J.
Abstract:: We have reconstructed chronology for the disturbed bottom parts of the GRIP and GISP2 ice cores using the combined paleoatmospheric records of CH₄ concentration and δ¹⁸O[subscript atm] in the trapped gases. Our reconstructed ages for basal ice samples are based on comparison of published measurements of CH₄ and δ¹⁸O[subscript atm]...
Resource Type:: Article
Full Text:: Sciences du Climat et de l’Environnement, CEA-CNRS, Gif sur Yvette, France Edward J. Brook Department of

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