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Discussion papers
https://doi.org/10.5194/essd-2019-231
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2019-231
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: brief communication 16 Jan 2020

Submitted as: brief communication | 16 Jan 2020

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A revised version of this preprint is currently under review for the journal ESSD.

Historical porosity data in polar firn

Kévin Fourteau1, Laurent Arnaud1, Xavier Faïn1, Patricia Martinerie1, David M. Etheridge2, Vladimir Lipenkov3, and Jean-Marc Barnola1,† Kévin Fourteau et al.
  • 1Univ. Grenoble Alpes, CNRS, IRD, Grenoble INP, IGE, F-38000 Grenoble, France
  • 2Climate Science Centre, CSIRO Oceans and Atmosphere, Aspendale, Victoria, Australia
  • 3Climate and Environmental Research Laboratory, Arctic and Antarctic Research Institute, St. Petersburg, 199397, Russia
  • deceased, September 21, 2009

Abstract. In the 1990's, closed and open porosity volumes of firn samples have been measured by J.-M. Barnola using the technique of gas pycnometry, on firn from three different polar sites. They are the basis of a parameterization of closed porosity in polar firn, first introduced in Goujon et al. (2003) and used in several firn physics models (e.g. Buizert et al., 2012). However, these data and their processing have not been published in their own right yet. In this short article, we detail how they were processed by J.-M. Barnola, and how the closed porosity parameterization was obtained. We show that the original data processing only partially accounts for the presence of re-opened bubbles in the samples. Since the proper correction to apply for this effect is hard to estimate, we also processed the data without including a correction for re-opened bubbles. Finally, we intend to make these pycnometry data available, in order to be used by the glaciology community, notably for the study of polar ice formation and of the composition of gas records in ice cores. They are hosted on the PANGAEA database: https://doi.pangaea.de/10.1594/PANGAEA.907678 (Fourteau et al., 2019a).

Kévin Fourteau et al.

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Gas pycnometry firn porosity data of firn ice cores from three polar sites K. Fourteau, L. Arnaud, X. Faïn, P. Martinerie, D. M. Etheridge, V. Lipenkov, and J.-M. Barnola https://doi.org/10.1594/PANGAEA.907678

Kévin Fourteau et al.

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Short summary
Measurements of the porosity of three polar firns have been conducted in the 1990's by Jean-Marc Barnola using the method of gas pycnometry. From these data, a parametrization of firn pore closure has been produced and used in different published articles. However, the data have not been published in their own right yet. We have made the data publicly accessible on the PANGAEA database and propose here to describe how they were obtained and used to produce the pore closure parametrization.
Measurements of the porosity of three polar firns have been conducted in the 1990's by Jean-Marc...
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