Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments 1
International audience Arctic landscapes are experiencing intense warming and modification of precipitation regimes with climate change. Permafrost disturbances and climate change impacts on hydrology of Arctic watersheds are likely to modify the quantity and composition of exported dissolved organi...
Published in: | Arctic Science |
---|---|
Main Authors: | , , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | French |
Published: |
HAL CCSD
2017
|
Subjects: | |
Online Access: | https://hal.science/hal-02438747 https://hal.science/hal-02438747/document https://hal.science/hal-02438747/file/Fouch%C3%A9%20et%20al.,%202017.pdf https://doi.org/10.1139/as-2016-0031 |
id |
ftinstagro:oai:HAL:hal-02438747v1 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Portail HAL Institut Agro |
op_collection_id |
ftinstagro |
language |
French |
topic |
active layer detachments dissolved organic matter fluorescence High Arctic parallel factor analysis (PARAFAC) décollements de la couche active matière organique dissoute Haut-Arctique analyse de facteurs parallèles (« PARAFAC ») [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
active layer detachments dissolved organic matter fluorescence High Arctic parallel factor analysis (PARAFAC) décollements de la couche active matière organique dissoute Haut-Arctique analyse de facteurs parallèles (« PARAFAC ») [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDE.MCG]Environmental Sciences/Global Changes Fouché, Julien Lafrenière, M., J Rutherford, K. Lamoureux, S. Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments 1 |
topic_facet |
active layer detachments dissolved organic matter fluorescence High Arctic parallel factor analysis (PARAFAC) décollements de la couche active matière organique dissoute Haut-Arctique analyse de facteurs parallèles (« PARAFAC ») [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Arctic landscapes are experiencing intense warming and modification of precipitation regimes with climate change. Permafrost disturbances and climate change impacts on hydrology of Arctic watersheds are likely to modify the quantity and composition of exported dissolved organic matter (DOM). In July 2007, intense rainfall and active layer thickening caused widespread active layer detachments at Cape Bounty, Melville Island (Canada). This study investigates the impacts of seasonal hydrology and permafrost disturbance on DOM composition exported from High Arctic headwater catchments. In 2012, streams were sampled from three disturbed catchments and one undisturbed catchment. The composition of DOM was characterized using absorbance and fluorescence spectroscopy. DOM was mostly exported during the spring freshet. Throughout this period, the undisturbed catchment exported humified DOM with high humic-like fluorescence that likely originated from runoff through shallow organic rich soil. In contrast, DOM exported from disturbed catchments was fresher, less humified with a high proportion of low molecular weight humic acid. We demonstrate that disturbed catchments delivered likely more labile DOM derived from either thawed permafrost or enhanced microbial activity. If this labile DOM comes from an ancient pool, as indicated by other studies at this site, disturbances may strengthen the permafrost carbon feedback on climate change. Avec le changement climatique, les paysages arctiques connaissent un réchauffe-ment intense et une modification des régimes de précipitation. Les impacts des perturbations du pergélisol et du changement climatique sur l'hydrologie des bassins hydrographiques arc-tiques vont probablement modifier la quantité et la composition de matière organique dis-soute (MOD) exportée. En juillet 2007, des averses intenses et l'épaississement de la couche active ont causé des décollements généralisés de la couche active à Cape Bounty, île Melville (Canada). Cette étude examine ... |
author2 |
Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) Queen's University Kingston, Canada |
format |
Article in Journal/Newspaper |
author |
Fouché, Julien Lafrenière, M., J Rutherford, K. Lamoureux, S. |
author_facet |
Fouché, Julien Lafrenière, M., J Rutherford, K. Lamoureux, S. |
author_sort |
Fouché, Julien |
title |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments 1 |
title_short |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments 1 |
title_full |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments 1 |
title_fullStr |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments 1 |
title_full_unstemmed |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments 1 |
title_sort |
seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in high arctic headwater catchments 1 |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://hal.science/hal-02438747 https://hal.science/hal-02438747/document https://hal.science/hal-02438747/file/Fouch%C3%A9%20et%20al.,%202017.pdf https://doi.org/10.1139/as-2016-0031 |
long_lat |
ENVELOPE(-109.542,-109.542,74.863,74.863) |
geographic |
Arctic Canada Cape Bounty |
geographic_facet |
Arctic Canada Cape Bounty |
genre |
Arctic Arctic Arctique* Climate change permafrost Melville Island pergélisol |
genre_facet |
Arctic Arctic Arctique* Climate change permafrost Melville Island pergélisol |
op_source |
ISSN: 2368-7460 Arctic Science https://hal.science/hal-02438747 Arctic Science, 2017, 3 (2), pp.378-405. ⟨10.1139/as-2016-0031⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1139/as-2016-0031 hal-02438747 https://hal.science/hal-02438747 https://hal.science/hal-02438747/document https://hal.science/hal-02438747/file/Fouch%C3%A9%20et%20al.,%202017.pdf doi:10.1139/as-2016-0031 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1139/as-2016-0031 |
container_title |
Arctic Science |
container_volume |
3 |
container_issue |
2 |
container_start_page |
378 |
op_container_end_page |
405 |
_version_ |
1785555417656459264 |
spelling |
ftinstagro:oai:HAL:hal-02438747v1 2023-12-17T10:23:02+01:00 Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments 1 Fouché, Julien Lafrenière, M., J Rutherford, K. Lamoureux, S. Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH) Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) Queen's University Kingston, Canada 2017 https://hal.science/hal-02438747 https://hal.science/hal-02438747/document https://hal.science/hal-02438747/file/Fouch%C3%A9%20et%20al.,%202017.pdf https://doi.org/10.1139/as-2016-0031 fr fre HAL CCSD NRC Research Press info:eu-repo/semantics/altIdentifier/doi/10.1139/as-2016-0031 hal-02438747 https://hal.science/hal-02438747 https://hal.science/hal-02438747/document https://hal.science/hal-02438747/file/Fouch%C3%A9%20et%20al.,%202017.pdf doi:10.1139/as-2016-0031 info:eu-repo/semantics/OpenAccess ISSN: 2368-7460 Arctic Science https://hal.science/hal-02438747 Arctic Science, 2017, 3 (2), pp.378-405. ⟨10.1139/as-2016-0031⟩ active layer detachments dissolved organic matter fluorescence High Arctic parallel factor analysis (PARAFAC) décollements de la couche active matière organique dissoute Haut-Arctique analyse de facteurs parallèles (« PARAFAC ») [SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/article Journal articles 2017 ftinstagro https://doi.org/10.1139/as-2016-0031 2023-11-18T22:34:01Z International audience Arctic landscapes are experiencing intense warming and modification of precipitation regimes with climate change. Permafrost disturbances and climate change impacts on hydrology of Arctic watersheds are likely to modify the quantity and composition of exported dissolved organic matter (DOM). In July 2007, intense rainfall and active layer thickening caused widespread active layer detachments at Cape Bounty, Melville Island (Canada). This study investigates the impacts of seasonal hydrology and permafrost disturbance on DOM composition exported from High Arctic headwater catchments. In 2012, streams were sampled from three disturbed catchments and one undisturbed catchment. The composition of DOM was characterized using absorbance and fluorescence spectroscopy. DOM was mostly exported during the spring freshet. Throughout this period, the undisturbed catchment exported humified DOM with high humic-like fluorescence that likely originated from runoff through shallow organic rich soil. In contrast, DOM exported from disturbed catchments was fresher, less humified with a high proportion of low molecular weight humic acid. We demonstrate that disturbed catchments delivered likely more labile DOM derived from either thawed permafrost or enhanced microbial activity. If this labile DOM comes from an ancient pool, as indicated by other studies at this site, disturbances may strengthen the permafrost carbon feedback on climate change. Avec le changement climatique, les paysages arctiques connaissent un réchauffe-ment intense et une modification des régimes de précipitation. Les impacts des perturbations du pergélisol et du changement climatique sur l'hydrologie des bassins hydrographiques arc-tiques vont probablement modifier la quantité et la composition de matière organique dis-soute (MOD) exportée. En juillet 2007, des averses intenses et l'épaississement de la couche active ont causé des décollements généralisés de la couche active à Cape Bounty, île Melville (Canada). Cette étude examine ... Article in Journal/Newspaper Arctic Arctic Arctique* Climate change permafrost Melville Island pergélisol Portail HAL Institut Agro Arctic Canada Cape Bounty ENVELOPE(-109.542,-109.542,74.863,74.863) Arctic Science 3 2 378 405 |