Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments
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...
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crcansciencepubl:10.1139/as-2016-0031 2024-06-23T07:48:15+00:00 Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments Fouché, J. Lafrenière, M. J. Rutherford, K. Lamoureux, S. 2017 http://dx.doi.org/10.1139/as-2016-0031 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2016-0031 https://cdnsciencepub.com/doi/pdf/10.1139/as-2016-0031 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Arctic Science volume 3, issue 2, page 378-405 ISSN 2368-7460 2368-7460 journal-article 2017 crcansciencepubl https://doi.org/10.1139/as-2016-0031 2024-06-06T04:11:16Z 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. Article in Journal/Newspaper Arctic Arctic Climate change permafrost Melville Island Canadian Science Publishing Arctic Canada Cape Bounty ENVELOPE(-109.542,-109.542,74.863,74.863) Arctic Science 3 2 378 405 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Fouché, J. Lafrenière, M. J. Rutherford, K. Lamoureux, S. |
spellingShingle |
Fouché, J. Lafrenière, M. J. Rutherford, K. Lamoureux, S. Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments |
author_facet |
Fouché, J. Lafrenière, M. J. Rutherford, K. Lamoureux, S. |
author_sort |
Fouché, J. |
title |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments |
title_short |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments |
title_full |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments |
title_fullStr |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments |
title_full_unstemmed |
Seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in High Arctic headwater catchments |
title_sort |
seasonal hydrology and permafrost disturbance impacts on dissolved organic matter composition in high arctic headwater catchments |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
http://dx.doi.org/10.1139/as-2016-0031 https://cdnsciencepub.com/doi/full-xml/10.1139/as-2016-0031 https://cdnsciencepub.com/doi/pdf/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 Climate change permafrost Melville Island |
genre_facet |
Arctic Arctic Climate change permafrost Melville Island |
op_source |
Arctic Science volume 3, issue 2, page 378-405 ISSN 2368-7460 2368-7460 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
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 |
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1802638681822986240 |