Skip to Main content Skip to Navigation
Journal articles

Continuous measurements of methane mixing ratios from ice cores

Abstract : This work presents a new, field-deployable technique for continuous, high-resolution measurements of methane mixing ratios from ice cores. The technique is based on a continuous flow analysis system, where ice core samples cut along the long axis of an ice core are melted continuously. The past atmospheric air contained in the ice is separated from the melt water stream via a system for continuous gas extraction. The extracted gas is dehumidified and then analyzed by a Wavelength Scanned-Cavity Ring Down Spectrometer for methane mixing ratios. We assess the performance of the new measurement technique in terms of precision ( ± 0.8 ppbv, 1 σ ), accuracy ( ± 8 ppbv), temporal (ca. 100 s), and spatial resolution (ca. 5 cm). Using a firn air transport model, we compare the resolution of the measurement technique to the resolution of the atmospheric methane signal as preserved in ice cores in Greenland. We conclude that our measurement technique can resolve all climatically relevant variations as preserved in the ice down to an ice depth of at least 1980 m (66 000 yr before present) in the North Greenland Eemian Ice Drilling ice core. Furthermore, we describe the modifications, which are necessary to make a commercially available spectrometer suitable for continuous methane mixing ratio measurements from ice cores.
Document type :
Journal articles
Complete list of metadata

Cited literature [32 references]  Display  Hide  Download
Contributor : Pascale Talour Connect in order to contact the contributor
Submitted on : Friday, July 12, 2013 - 5:17:08 PM
Last modification on : Friday, August 5, 2022 - 12:31:03 PM
Long-term archiving on: : Monday, October 14, 2013 - 11:20:49 AM


Publisher files allowed on an open archive




C. Stowasser, C. Buizert, V. Gkinis, J. Chappellaz, S. Schüpbach, et al.. Continuous measurements of methane mixing ratios from ice cores. Atmospheric Measurement Techniques, European Geosciences Union, 2012, 5, pp.999- 1013. ⟨10.5194/amt-5-999-2012⟩. ⟨insu-00844086⟩



Record views


Files downloads