Impact of measured and simulated tundra snowpack properties on heat transfer
Snowpack microstructure controls the transfer of heat to, and the temperature of, the underlying soils. In situ measurements of snow and soil properties from four field campaigns during two different winters (March and November 2018, January and March 2019) were compared to an ensemble of CLM5.0 (Co...
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ftcopernicus:oai:publications.copernicus.org:tcd98070 2023-05-15T15:07:49+02:00 Impact of measured and simulated tundra snowpack properties on heat transfer Dutch, Victoria R. Rutter, Nick Wake, Leanne Sandells, Melody Derksen, Chris Walker, Branden Hould Gosselin, Gabriel Sonnentag, Oliver Essery, Richard Kelly, Richard Marsh, Philip King, Joshua 2021-10-08 application/pdf https://doi.org/10.5194/tc-2021-313 https://tc.copernicus.org/preprints/tc-2021-313/ eng eng doi:10.5194/tc-2021-313 https://tc.copernicus.org/preprints/tc-2021-313/ eISSN: 1994-0424 Text 2021 ftcopernicus https://doi.org/10.5194/tc-2021-313 2021-10-11T16:22:28Z Snowpack microstructure controls the transfer of heat to, and the temperature of, the underlying soils. In situ measurements of snow and soil properties from four field campaigns during two different winters (March and November 2018, January and March 2019) were compared to an ensemble of CLM5.0 (Community Land Model) simulations, at Trail Valley Creek, Northwest Territories, Canada. Snow MicroPenetrometer profiles allowed snowpack density and thermal conductivity to be derived at higher vertical resolution (1.25 mm) and a larger sample size (n = 1050) compared to traditional snowpit observations (3 cm vertical resolution; n = 115). Comparing measurements with simulations shows CLM overestimated snow thermal conductivity by a factor of 3, leading to a cold bias in wintertime soil temperatures (RMSE = 5.8 °C). Bias-correction of the simulated thermal conductivity (relative to field measurements) improved simulated soil temperatures (RMSE = 2.1 °C). Multiple linear regression shows the required correction factor is strongly related to snow depth (R 2 = 0.77, RMSE = 0.066) particularly early in the winter. Furthermore, CLM simulations did not adequately represent the observed high proportions of depth hoar. Addressing uncertainty in simulated snow properties and the corresponding heat flux is important, as wintertime soil temperatures act as a control on subnivean soil respiration, and hence impact Arctic winter carbon fluxes and budgets. Text Arctic Northwest Territories Tundra Copernicus Publications: E-Journals Arctic Canada Northwest Territories Trail Valley Creek ENVELOPE(-133.415,-133.415,68.772,68.772) Valley Creek ENVELOPE(-138.324,-138.324,63.326,63.326) |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Snowpack microstructure controls the transfer of heat to, and the temperature of, the underlying soils. In situ measurements of snow and soil properties from four field campaigns during two different winters (March and November 2018, January and March 2019) were compared to an ensemble of CLM5.0 (Community Land Model) simulations, at Trail Valley Creek, Northwest Territories, Canada. Snow MicroPenetrometer profiles allowed snowpack density and thermal conductivity to be derived at higher vertical resolution (1.25 mm) and a larger sample size (n = 1050) compared to traditional snowpit observations (3 cm vertical resolution; n = 115). Comparing measurements with simulations shows CLM overestimated snow thermal conductivity by a factor of 3, leading to a cold bias in wintertime soil temperatures (RMSE = 5.8 °C). Bias-correction of the simulated thermal conductivity (relative to field measurements) improved simulated soil temperatures (RMSE = 2.1 °C). Multiple linear regression shows the required correction factor is strongly related to snow depth (R 2 = 0.77, RMSE = 0.066) particularly early in the winter. Furthermore, CLM simulations did not adequately represent the observed high proportions of depth hoar. Addressing uncertainty in simulated snow properties and the corresponding heat flux is important, as wintertime soil temperatures act as a control on subnivean soil respiration, and hence impact Arctic winter carbon fluxes and budgets. |
format |
Text |
author |
Dutch, Victoria R. Rutter, Nick Wake, Leanne Sandells, Melody Derksen, Chris Walker, Branden Hould Gosselin, Gabriel Sonnentag, Oliver Essery, Richard Kelly, Richard Marsh, Philip King, Joshua |
spellingShingle |
Dutch, Victoria R. Rutter, Nick Wake, Leanne Sandells, Melody Derksen, Chris Walker, Branden Hould Gosselin, Gabriel Sonnentag, Oliver Essery, Richard Kelly, Richard Marsh, Philip King, Joshua Impact of measured and simulated tundra snowpack properties on heat transfer |
author_facet |
Dutch, Victoria R. Rutter, Nick Wake, Leanne Sandells, Melody Derksen, Chris Walker, Branden Hould Gosselin, Gabriel Sonnentag, Oliver Essery, Richard Kelly, Richard Marsh, Philip King, Joshua |
author_sort |
Dutch, Victoria R. |
title |
Impact of measured and simulated tundra snowpack properties on heat transfer |
title_short |
Impact of measured and simulated tundra snowpack properties on heat transfer |
title_full |
Impact of measured and simulated tundra snowpack properties on heat transfer |
title_fullStr |
Impact of measured and simulated tundra snowpack properties on heat transfer |
title_full_unstemmed |
Impact of measured and simulated tundra snowpack properties on heat transfer |
title_sort |
impact of measured and simulated tundra snowpack properties on heat transfer |
publishDate |
2021 |
url |
https://doi.org/10.5194/tc-2021-313 https://tc.copernicus.org/preprints/tc-2021-313/ |
long_lat |
ENVELOPE(-133.415,-133.415,68.772,68.772) ENVELOPE(-138.324,-138.324,63.326,63.326) |
geographic |
Arctic Canada Northwest Territories Trail Valley Creek Valley Creek |
geographic_facet |
Arctic Canada Northwest Territories Trail Valley Creek Valley Creek |
genre |
Arctic Northwest Territories Tundra |
genre_facet |
Arctic Northwest Territories Tundra |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-2021-313 https://tc.copernicus.org/preprints/tc-2021-313/ |
op_doi |
https://doi.org/10.5194/tc-2021-313 |
_version_ |
1766339236519215104 |