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In-situ monitoring of the time evolution of the effective thermal conductivity of snow

S. Morin 1, 2 F. Dominè 1 L. Arnaud 3 G. Picard 1
2 CEN - Centre d'Etudes de la Neige
CNRM - Centre national de recherches météorologiques
LGGE - Laboratoire de glaciologie et géophysique de l'environnement
Abstract : We report on a 3-month long time series of in-situ measurements of the effective thermal conductivity (keff) of snow at 6 heights in an Alpine snowpack in the Mont-Blanc mountain range, France, at an altitude of 2400 m. Measurements were carried out automatically every 2 days using heated-needle probes embedded in the snowpack. The experimental procedure used is presented in detail and demonstrates the applicability of single heated-needle probes for the evaluation of keff in snow, both for long-term measurements within the snowpack and occasional use in the field. Results based on 139 automatically collected data show keff values ranging between 0.04 and 0.35 W m− 1 K− 1, and a consistent pattern of effective thermal conductivity increase throughout the measurements campaign. The temporal rate of change of keff varies up to 0.01 W m−1 K− 1day− 1, with maximum values just after snowfall.
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Submitted on : Thursday, February 3, 2011 - 12:02:27 AM
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S. Morin, F. Dominè, L. Arnaud, G. Picard. In-situ monitoring of the time evolution of the effective thermal conductivity of snow. Cold Regions Science and Technology, Elsevier, 2010, 64 (2), pp.73-80. ⟨10.1016/j.coldregions.2010.02.008⟩. ⟨insu-00562255⟩



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