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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 : Volume 7, Issue 11 (19/11/2014)

By Bauska, T. K.

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Book Id: WPLBN0003999523
Format Type: PDF Article :
File Size: Pages 13
Reproduction Date: 2015

Title: High-precision Dual-inlet Irms Measurements of the Stable Isotopes of Co2 and the N2O / Co2 Ratio from Polar Ice Core Samples : Volume 7, Issue 11 (19/11/2014)  
Author: Bauska, T. K.
Volume: Vol. 7, Issue 11
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Brook, E. J., Ross, A., Mix, A. C., & Bauska, T. K. (2014). High-precision Dual-inlet Irms Measurements of the Stable Isotopes of Co2 and the N2O / Co2 Ratio from Polar Ice Core Samples : Volume 7, Issue 11 (19/11/2014). Retrieved from

Description: College of Earth, Ocean and Atmospheric Sciences, Oregon State University, Corvallis, OR 97331, USA. 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 the δ13C of CO2 at very high precision, as well as measuring the CO2 and N2O mixing ratios. In this method, ancient air is extracted from relatively large ice samples (~400 g) with a dry-extraction ice grater device. The liberated air is cryogenically purified to a CO2 and N2O mixture and analyzed with a microvolume-equipped dual-inlet IRMS (Thermo MAT 253). The reproducibility of the method, based on replicate analysis of ice core samples, is 0.02‰ for δ13C-CO2 and 2 ppm and 4 ppb for the CO2 and N2O mixing ratios, respectively (1σ pooled standard deviation). Our experiments show that minimizing water vapor pressure in the extraction vessel by housing the grating apparatus in a ultralow-temperature freezer (−60 °C) improves the precision and decreases the experimental blank of the method to −0.07 ± 0.04‰. We describe techniques for accurate calibration of small samples and the application of a mass-spectrometric method based on source fragmentation for reconstructing the N2O history of the atmosphere. The oxygen isotopic composition of CO2 is also investigated, confirming previous observations of oxygen exchange between gaseous CO2 and solid H2O within the ice archive. These data offer a possible constraint on oxygen isotopic fractionation during H2O and CO2 exchange below the H2O bulk melting temperature.

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

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