Diurnal evolution of the temperature sensitivity of CO2 efflux in permafrost soils under control and warm conditions
International audience Cryosols contain similar to 33% of the global soil organic carbon. Cryosol warming and permafrost degradation may enhance the CO2 release to the atmosphere through the microbial decomposition. Despite the large carbon pool, the permafrost carbon feedback on the climate remains...
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ftinsu:oai:HAL:hal-01765457v1 2023-12-17T10:48:34+01:00 Diurnal evolution of the temperature sensitivity of CO2 efflux in permafrost soils under control and warm conditions Fouche, Julien Keller, Catherine Allard, Michel Ambrosi, Jean-Paul Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) 2017 https://hal.science/hal-01765457 https://doi.org/10.1016/j.scitotenv.2016.12.089 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.scitotenv.2016.12.089 hal-01765457 https://hal.science/hal-01765457 doi:10.1016/j.scitotenv.2016.12.089 ISSN: 0048-9697 EISSN: 1879-1026 Science of the Total Environment https://hal.science/hal-01765457 Science of the Total Environment, 2017, 581, pp.161-173. ⟨10.1016/j.scitotenv.2016.12.089⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2017 ftinsu https://doi.org/10.1016/j.scitotenv.2016.12.089 2023-11-22T17:47:48Z International audience Cryosols contain similar to 33% of the global soil organic carbon. Cryosol warming and permafrost degradation may enhance the CO2 release to the atmosphere through the microbial decomposition. Despite the large carbon pool, the permafrost carbon feedback on the climate remains uncertain. In this study, we aimed at better understanding the diurnal evolution of the temperature sensitivity of CO2 efflux in Cryosols. A Histic Cryosol and a Turbic Cryosol were instrumented in tussock tundra ecosystems near Salluit (Nunavik, Canada). Open top chambers were installed during summer 2011 and the ground temperature, the soil moisture and meteorological variables were recorded hourly while the ecosystem respiration was measured three times per day every second day with opaque and closed.dynamic chambers in control and warm stations. Despite warmer conditions, the average CO2 efflux at the control stations at the Histic site (1.29 +/- 0.45 mu molCO(2) m(-2) s(-1)) was lower than at the Turbic site (2.30 +/- 0.74 mu molCO(2) m(-2) s(-1)). The increase in CO2 efflux with warming was greater in the Histic Cryosol (similar to 39%) than in the Turbic Cryosol (similar to 16%). Our study showed that the temperature sensitivity of the ecosystem respiration evolved during the day and decreased with the experimental warming. Both sites exhibited diurnal hysteresis loops between CO2 efflux and the soil surface temperature. The width of hysteresis loops increased with the solar radiation and decreased along the growing season. We developed simple linear models that took into account the diurnal evolution of the temperature sensitivity of CO2 efflux and we estimated the seasonal cumulative carbon release to the atmosphere. The calculation using solely diurnal measurements significantly differed `from the seasonal carbon release modelled hourly. Our study highlighted that the time of the day when measurements are performed should be taken into account to accurately estimate the seasonal carbon release from tundra ... Article in Journal/Newspaper permafrost Salluit Tundra Nunavik Institut national des sciences de l'Univers: HAL-INSU Canada Nunavik Salluit ENVELOPE(-75.643,-75.643,62.204,62.204) Science of The Total Environment 581-582 161 173 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Fouche, Julien Keller, Catherine Allard, Michel Ambrosi, Jean-Paul Diurnal evolution of the temperature sensitivity of CO2 efflux in permafrost soils under control and warm conditions |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Cryosols contain similar to 33% of the global soil organic carbon. Cryosol warming and permafrost degradation may enhance the CO2 release to the atmosphere through the microbial decomposition. Despite the large carbon pool, the permafrost carbon feedback on the climate remains uncertain. In this study, we aimed at better understanding the diurnal evolution of the temperature sensitivity of CO2 efflux in Cryosols. A Histic Cryosol and a Turbic Cryosol were instrumented in tussock tundra ecosystems near Salluit (Nunavik, Canada). Open top chambers were installed during summer 2011 and the ground temperature, the soil moisture and meteorological variables were recorded hourly while the ecosystem respiration was measured three times per day every second day with opaque and closed.dynamic chambers in control and warm stations. Despite warmer conditions, the average CO2 efflux at the control stations at the Histic site (1.29 +/- 0.45 mu molCO(2) m(-2) s(-1)) was lower than at the Turbic site (2.30 +/- 0.74 mu molCO(2) m(-2) s(-1)). The increase in CO2 efflux with warming was greater in the Histic Cryosol (similar to 39%) than in the Turbic Cryosol (similar to 16%). Our study showed that the temperature sensitivity of the ecosystem respiration evolved during the day and decreased with the experimental warming. Both sites exhibited diurnal hysteresis loops between CO2 efflux and the soil surface temperature. The width of hysteresis loops increased with the solar radiation and decreased along the growing season. We developed simple linear models that took into account the diurnal evolution of the temperature sensitivity of CO2 efflux and we estimated the seasonal cumulative carbon release to the atmosphere. The calculation using solely diurnal measurements significantly differed `from the seasonal carbon release modelled hourly. Our study highlighted that the time of the day when measurements are performed should be taken into account to accurately estimate the seasonal carbon release from tundra ... |
author2 |
Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Fouche, Julien Keller, Catherine Allard, Michel Ambrosi, Jean-Paul |
author_facet |
Fouche, Julien Keller, Catherine Allard, Michel Ambrosi, Jean-Paul |
author_sort |
Fouche, Julien |
title |
Diurnal evolution of the temperature sensitivity of CO2 efflux in permafrost soils under control and warm conditions |
title_short |
Diurnal evolution of the temperature sensitivity of CO2 efflux in permafrost soils under control and warm conditions |
title_full |
Diurnal evolution of the temperature sensitivity of CO2 efflux in permafrost soils under control and warm conditions |
title_fullStr |
Diurnal evolution of the temperature sensitivity of CO2 efflux in permafrost soils under control and warm conditions |
title_full_unstemmed |
Diurnal evolution of the temperature sensitivity of CO2 efflux in permafrost soils under control and warm conditions |
title_sort |
diurnal evolution of the temperature sensitivity of co2 efflux in permafrost soils under control and warm conditions |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-01765457 https://doi.org/10.1016/j.scitotenv.2016.12.089 |
long_lat |
ENVELOPE(-75.643,-75.643,62.204,62.204) |
geographic |
Canada Nunavik Salluit |
geographic_facet |
Canada Nunavik Salluit |
genre |
permafrost Salluit Tundra Nunavik |
genre_facet |
permafrost Salluit Tundra Nunavik |
op_source |
ISSN: 0048-9697 EISSN: 1879-1026 Science of the Total Environment https://hal.science/hal-01765457 Science of the Total Environment, 2017, 581, pp.161-173. ⟨10.1016/j.scitotenv.2016.12.089⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.scitotenv.2016.12.089 hal-01765457 https://hal.science/hal-01765457 doi:10.1016/j.scitotenv.2016.12.089 |
op_doi |
https://doi.org/10.1016/j.scitotenv.2016.12.089 |
container_title |
Science of The Total Environment |
container_volume |
581-582 |
container_start_page |
161 |
op_container_end_page |
173 |
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1785572777068068864 |