On the use of heated needle probes for measuring snow thermal conductivity
Abstract Heated needle probes provide the most convenient method to measure snow thermal conductivity. Recent studies have suggested that this method underestimates snow thermal conductivity; however the reasons for this discrepancy have not been elucidated. We show that it originates from the fact...
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Cambridge University Press (CUP)
2022
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Online Access: | http://dx.doi.org/10.1017/jog.2021.127 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021001271 |
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crcambridgeupr:10.1017/jog.2021.127 2024-03-03T08:46:05+00:00 On the use of heated needle probes for measuring snow thermal conductivity Fourteau, Kévin Hagenmuller, Pascal Roulle, Jacques Domine, Florent Fondation BNP Paribas 2022 http://dx.doi.org/10.1017/jog.2021.127 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021001271 en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ Journal of Glaciology volume 68, issue 270, page 705-719 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 2022 crcambridgeupr https://doi.org/10.1017/jog.2021.127 2024-02-08T08:47:46Z Abstract Heated needle probes provide the most convenient method to measure snow thermal conductivity. Recent studies have suggested that this method underestimates snow thermal conductivity; however the reasons for this discrepancy have not been elucidated. We show that it originates from the fact that, while the theory behind the method assumes that the measurements reach a logarithmic regime, this regime is not reached within the standard measurement procedure. Using the needle probe without this logarithmic regime leads to thermal conductivity underestimations of tens of percents. Moreover, we show that the poor thermal contact between the probe and the snow due to insertion damages results in a further underestimation. Thus, we encourage the use of fixed needle probes, set up before the snow season and buried under snowfalls, rather than hand-inserted probes. Finally, we propose a method to correct the measurements performed with such fixed needle probes buried in snow. This correction is based on a lookup table, derived specifically for the Hukseflux TP02 needle probe model, frequently used in snow studies. Comparison between corrected measurements and independent estimations of snow thermal conductivity obtained with numerical simulations shows an overall improvement of the needle probe values after application of the correction. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press The Needle ENVELOPE(-64.047,-64.047,63.267,63.267) Journal of Glaciology 1 15 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Fourteau, Kévin Hagenmuller, Pascal Roulle, Jacques Domine, Florent On the use of heated needle probes for measuring snow thermal conductivity |
topic_facet |
Earth-Surface Processes |
description |
Abstract Heated needle probes provide the most convenient method to measure snow thermal conductivity. Recent studies have suggested that this method underestimates snow thermal conductivity; however the reasons for this discrepancy have not been elucidated. We show that it originates from the fact that, while the theory behind the method assumes that the measurements reach a logarithmic regime, this regime is not reached within the standard measurement procedure. Using the needle probe without this logarithmic regime leads to thermal conductivity underestimations of tens of percents. Moreover, we show that the poor thermal contact between the probe and the snow due to insertion damages results in a further underestimation. Thus, we encourage the use of fixed needle probes, set up before the snow season and buried under snowfalls, rather than hand-inserted probes. Finally, we propose a method to correct the measurements performed with such fixed needle probes buried in snow. This correction is based on a lookup table, derived specifically for the Hukseflux TP02 needle probe model, frequently used in snow studies. Comparison between corrected measurements and independent estimations of snow thermal conductivity obtained with numerical simulations shows an overall improvement of the needle probe values after application of the correction. |
author2 |
Fondation BNP Paribas |
format |
Article in Journal/Newspaper |
author |
Fourteau, Kévin Hagenmuller, Pascal Roulle, Jacques Domine, Florent |
author_facet |
Fourteau, Kévin Hagenmuller, Pascal Roulle, Jacques Domine, Florent |
author_sort |
Fourteau, Kévin |
title |
On the use of heated needle probes for measuring snow thermal conductivity |
title_short |
On the use of heated needle probes for measuring snow thermal conductivity |
title_full |
On the use of heated needle probes for measuring snow thermal conductivity |
title_fullStr |
On the use of heated needle probes for measuring snow thermal conductivity |
title_full_unstemmed |
On the use of heated needle probes for measuring snow thermal conductivity |
title_sort |
on the use of heated needle probes for measuring snow thermal conductivity |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/jog.2021.127 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143021001271 |
long_lat |
ENVELOPE(-64.047,-64.047,63.267,63.267) |
geographic |
The Needle |
geographic_facet |
The Needle |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 68, issue 270, page 705-719 ISSN 0022-1430 1727-5652 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1017/jog.2021.127 |
container_title |
Journal of Glaciology |
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1 |
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15 |
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1792501977720029184 |