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Atmospheric helium isotopic ratio from 1910 to 2016 recorded in stainless steel containers

C. Boucher1,

1Centre de Recherches Pétrographiques et Géochimiques, CNRS and Université de Lorraine, Vandœuvre-lès-Nancy, France

B. Marty1,

1Centre de Recherches Pétrographiques et Géochimiques, CNRS and Université de Lorraine, Vandœuvre-lès-Nancy, France

L. Zimmermann1,

1Centre de Recherches Pétrographiques et Géochimiques, CNRS and Université de Lorraine, Vandœuvre-lès-Nancy, France

R. Langenfelds2

2Commonwealth Scientific and Industrial Research Organisation, Oceans and Atmosphere, Aspendale, Australia

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Boucher, C., Marty, B., Zimmermann, L., Langenfelds, R. (2018) Atmospheric helium isotopic ratio from 1910 to 2016 recorded in stainless steel containers. Geochem. Persp. Let. 6, 23–27.

This work was supported by the European Research Council (grant No. 267255) and by the Deep Carbon Observatory (DCO).

Geochemical Perspectives Letters v6  |  doi: 10.7185/geochemlet.1804
Received 07 October 2017  |  Accepted 29 January 2018  |  Published 19 February 2018
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Figure 1 (a) Stainless steel chamber. (b) Sectional view of the chamber. (c) Hydraulic press KSC-10. (d) Pétanque ball pierced. (e) Carburettor float.
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Figure 2 Error-weighted mean (x̅) of the He isotope ratios, expressed as RBB (diamond points; CG = Cape Grim; B = pétanque ball, CAR = carburettor), over time. Mabry et al. (2015)

Mabry, J., Lan, T., Boucher, C., Burnard, P., Brennwald, M., Langenfelds, R., Marty, B. (2015) No evidence for change of the atmospheric helium isotope composition since 1978 from re-analysis of the cape grim air archive. Earth and Planetary Science Letters 428, 134–138.

data (pink dots) are also normalised to BB air. Lupton and Evans (2013)

Lupton, J., Evans, L. (2013) Changes in the atmospheric helium isotope ratio over the past 40 years. Geophysical Research Letters 40, 6271–6275.

data (blue squares) are normalised to 2013 La Jolla air (California, USA). The weighted linear regression fits 1, 2 and 3 are obtained using data of Lupton and Evans (2013)

Lupton, J., Evans, L. (2013) Changes in the atmospheric helium isotope ratio over the past 40 years. Geophysical Research Letters 40, 6271–6275.

, Mabry et al. (2015)

Mabry, J., Lan, T., Boucher, C., Burnard, P., Brennwald, M., Langenfelds, R., Marty, B. (2015) No evidence for change of the atmospheric helium isotope composition since 1978 from re-analysis of the cape grim air archive. Earth and Planetary Science Letters 428, 134–138.

and the combination of our data with those of Mabry et al. (2015)

Mabry, J., Lan, T., Boucher, C., Burnard, P., Brennwald, M., Langenfelds, R., Marty, B. (2015) No evidence for change of the atmospheric helium isotope composition since 1978 from re-analysis of the cape grim air archive. Earth and Planetary Science Letters 428, 134–138.

, respectively. The uncertainty envelope of fit 3 is shown in grey shaded area. Results are reported at 95 % CI (equivalent to 2σ).
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