Simulating net ecosystem exchange under seasonal snow cover at an Arctic tundra site
Estimates of winter (snow-covered non-growing season) CO2 fluxes across the Arctic region vary by a factor of 3.5, with considerable variation between measured and simulated fluxes. Measurements of snow properties, soil temperatures, and net ecosystem exchange (NEE) at Trail Valley Creek, NWT, Canad...
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Humboldt-Universität zu Berlin
2024
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Online Access: | http://edoc.hu-berlin.de/18452/29278 https://nbn-resolving.org/urn:nbn:de:kobv:11-110-18452/29278-4 https://doi.org/10.18452/28663 https://doi.org/10.5194/bg-21-825-2024 |
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fthuberlin:oai:edoc.hu-berlin.de:18452/29278 2024-06-23T07:50:11+00:00 Simulating net ecosystem exchange under seasonal snow cover at an Arctic tundra site Dutch, Victoria Rutter, Nick Wake, Leanne Sonnentag, Oliver Hould Gosselin, Gabriel Sandells, Melody Derksen, Chris Walker, Branden Meyer, Gesa Essery, Richard Kelly, Richard Marsh, Philip Boike, Julia Detto, Matteo 2024-02-15 application/pdf http://edoc.hu-berlin.de/18452/29278 https://nbn-resolving.org/urn:nbn:de:kobv:11-110-18452/29278-4 https://doi.org/10.18452/28663 https://doi.org/10.5194/bg-21-825-2024 eng eng Humboldt-Universität zu Berlin http://edoc.hu-berlin.de/18452/29278 urn:nbn:de:kobv:11-110-18452/29278-4 http://dx.doi.org/10.18452/28663 1726-4189 doi:10.5194/bg-21-825-2024 (CC BY 4.0) Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ 550 Geowissenschaften ddc:550 article doc-type:article publishedVersion 2024 fthuberlin https://doi.org/10.18452/2866310.5194/bg-21-825-2024 2024-05-29T06:45:38Z Estimates of winter (snow-covered non-growing season) CO2 fluxes across the Arctic region vary by a factor of 3.5, with considerable variation between measured and simulated fluxes. Measurements of snow properties, soil temperatures, and net ecosystem exchange (NEE) at Trail Valley Creek, NWT, Canada, allowed for the evaluation of simulated winter NEE in a tundra environment with the Community Land Model (CLM5.0). Default CLM5.0 parameterisations did not adequately simulate winter NEE in this tundra environment, with near-zero NEE (< 0.01 gCm^-2d^-1) simulated between November and mid-May. In contrast, measured NEE was broadly positive (indicating net CO2 release) from snow-cover onset until late April. Changes to the parameterisation of snow thermal conductivity, required to correct for a cold soil temperature bias, reduced the duration for which no NEE was simulated. Parameter sensitivity analysis revealed the critical role of the minimum soil moisture threshold of decomposition (Ψmin) in regulating winter soil respiration. The default value of this parameter (Ψmin) was too high, preventing simulation of soil respiration for the vast majority of the snow-covered season. In addition, the default rate of change of soil respiration with temperature (Q10) was too low, further contributing to poor model performance during winter. As Ψmin and Q10 had opposing effects on the magnitude of simulated winter soil respiration, larger negative values of Ψmin and larger positive values of Q10 are required to simulate wintertime NEE more adequately. Natural Environment Research Council Peer Reviewed Article in Journal/Newspaper Arctic Tundra Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server Arctic Canada Trail Valley Creek ENVELOPE(-133.415,-133.415,68.772,68.772) Valley Creek ENVELOPE(-138.324,-138.324,63.326,63.326) |
institution |
Open Polar |
collection |
Open-Access-Publikationsserver der Humboldt-Universität: edoc-Server |
op_collection_id |
fthuberlin |
language |
English |
topic |
550 Geowissenschaften ddc:550 |
spellingShingle |
550 Geowissenschaften ddc:550 Dutch, Victoria Rutter, Nick Wake, Leanne Sonnentag, Oliver Hould Gosselin, Gabriel Sandells, Melody Derksen, Chris Walker, Branden Meyer, Gesa Essery, Richard Kelly, Richard Marsh, Philip Boike, Julia Detto, Matteo Simulating net ecosystem exchange under seasonal snow cover at an Arctic tundra site |
topic_facet |
550 Geowissenschaften ddc:550 |
description |
Estimates of winter (snow-covered non-growing season) CO2 fluxes across the Arctic region vary by a factor of 3.5, with considerable variation between measured and simulated fluxes. Measurements of snow properties, soil temperatures, and net ecosystem exchange (NEE) at Trail Valley Creek, NWT, Canada, allowed for the evaluation of simulated winter NEE in a tundra environment with the Community Land Model (CLM5.0). Default CLM5.0 parameterisations did not adequately simulate winter NEE in this tundra environment, with near-zero NEE (< 0.01 gCm^-2d^-1) simulated between November and mid-May. In contrast, measured NEE was broadly positive (indicating net CO2 release) from snow-cover onset until late April. Changes to the parameterisation of snow thermal conductivity, required to correct for a cold soil temperature bias, reduced the duration for which no NEE was simulated. Parameter sensitivity analysis revealed the critical role of the minimum soil moisture threshold of decomposition (Ψmin) in regulating winter soil respiration. The default value of this parameter (Ψmin) was too high, preventing simulation of soil respiration for the vast majority of the snow-covered season. In addition, the default rate of change of soil respiration with temperature (Q10) was too low, further contributing to poor model performance during winter. As Ψmin and Q10 had opposing effects on the magnitude of simulated winter soil respiration, larger negative values of Ψmin and larger positive values of Q10 are required to simulate wintertime NEE more adequately. Natural Environment Research Council Peer Reviewed |
format |
Article in Journal/Newspaper |
author |
Dutch, Victoria Rutter, Nick Wake, Leanne Sonnentag, Oliver Hould Gosselin, Gabriel Sandells, Melody Derksen, Chris Walker, Branden Meyer, Gesa Essery, Richard Kelly, Richard Marsh, Philip Boike, Julia Detto, Matteo |
author_facet |
Dutch, Victoria Rutter, Nick Wake, Leanne Sonnentag, Oliver Hould Gosselin, Gabriel Sandells, Melody Derksen, Chris Walker, Branden Meyer, Gesa Essery, Richard Kelly, Richard Marsh, Philip Boike, Julia Detto, Matteo |
author_sort |
Dutch, Victoria |
title |
Simulating net ecosystem exchange under seasonal snow cover at an Arctic tundra site |
title_short |
Simulating net ecosystem exchange under seasonal snow cover at an Arctic tundra site |
title_full |
Simulating net ecosystem exchange under seasonal snow cover at an Arctic tundra site |
title_fullStr |
Simulating net ecosystem exchange under seasonal snow cover at an Arctic tundra site |
title_full_unstemmed |
Simulating net ecosystem exchange under seasonal snow cover at an Arctic tundra site |
title_sort |
simulating net ecosystem exchange under seasonal snow cover at an arctic tundra site |
publisher |
Humboldt-Universität zu Berlin |
publishDate |
2024 |
url |
http://edoc.hu-berlin.de/18452/29278 https://nbn-resolving.org/urn:nbn:de:kobv:11-110-18452/29278-4 https://doi.org/10.18452/28663 https://doi.org/10.5194/bg-21-825-2024 |
long_lat |
ENVELOPE(-133.415,-133.415,68.772,68.772) ENVELOPE(-138.324,-138.324,63.326,63.326) |
geographic |
Arctic Canada Trail Valley Creek Valley Creek |
geographic_facet |
Arctic Canada Trail Valley Creek Valley Creek |
genre |
Arctic Tundra |
genre_facet |
Arctic Tundra |
op_relation |
http://edoc.hu-berlin.de/18452/29278 urn:nbn:de:kobv:11-110-18452/29278-4 http://dx.doi.org/10.18452/28663 1726-4189 doi:10.5194/bg-21-825-2024 |
op_rights |
(CC BY 4.0) Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.18452/2866310.5194/bg-21-825-2024 |
_version_ |
1802641059852845056 |