Active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from High Arctic headwater catchments
This study investigates the impacts of active layer detachments (ALDs) on nitrogen in seasonal runoff from High Arctic hillslope catchments. We examined dissolved nitrogen in runoff from an undisturbed catchment (Goose (GS)) and one that was disturbed (Ptarmigan (PT)) by ALDs, prior to disturbance (...
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Canadian Science Publishing
2017
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Online Access: | https://doi.org/10.1139/as-2015-0009 https://doaj.org/article/4735fcf8b8c84a16a7d2e58a499c4276 |
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ftdoajarticles:oai:doaj.org/article:4735fcf8b8c84a16a7d2e58a499c4276 2023-05-15T14:23:42+02:00 Active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from High Arctic headwater catchments Melissa J. Lafrenière Nicole L. Louiseize Scott F. Lamoureux 2017-06-01T00:00:00Z https://doi.org/10.1139/as-2015-0009 https://doaj.org/article/4735fcf8b8c84a16a7d2e58a499c4276 EN FR eng fre Canadian Science Publishing https://doi.org/10.1139/as-2015-0009 https://doaj.org/toc/2368-7460 doi:10.1139/as-2015-0009 2368-7460 https://doaj.org/article/4735fcf8b8c84a16a7d2e58a499c4276 Arctic Science, Vol 3, Iss 2, Pp 429-450 (2017) dissolved nitrogen active layer detachment precipitation nitrate high arctic Environmental sciences GE1-350 Environmental engineering TA170-171 article 2017 ftdoajarticles https://doi.org/10.1139/as-2015-0009 2022-12-31T10:04:44Z This study investigates the impacts of active layer detachments (ALDs) on nitrogen in seasonal runoff from High Arctic hillslope catchments. We examined dissolved nitrogen in runoff from an undisturbed catchment (Goose (GS)) and one that was disturbed (Ptarmigan (PT)) by ALDs, prior to disturbance (2007) and 5 years after disturbance (2012). The seasonal dynamics of nitrogen species concentrations and fluxes were similar in both catchments in 2007, but the mean seasonal nitrate concentration and mass flux from the disturbed catchment were on the order of 30 times higher relative to the undisturbed catchment in 2012. Stormflow yielded 45% and 60% of the 2012 total dissolved nitrogen flux in GS and PT, respectively, although rainfall runoff provided less than 25% of seasonal discharge. Results support that through the combined effects of increased disturbance and rainfall, climate change stands to significantly enhance the export of nitrate from High Arctic watersheds. This study highlights that the increase in the delivery of nitrate from disturbance is especially pronounced late in the season when downstream productivity and the biological demand for this often limiting nutrient are high. Our results also demonstrate that the impact of ALDs on nitrate export can persist more than 5 years following disturbance. Article in Journal/Newspaper Arctic Arctic Climate change Directory of Open Access Journals: DOAJ Articles Arctic Arctic Science 3 2 429 450 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English French |
topic |
dissolved nitrogen active layer detachment precipitation nitrate high arctic Environmental sciences GE1-350 Environmental engineering TA170-171 |
spellingShingle |
dissolved nitrogen active layer detachment precipitation nitrate high arctic Environmental sciences GE1-350 Environmental engineering TA170-171 Melissa J. Lafrenière Nicole L. Louiseize Scott F. Lamoureux Active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from High Arctic headwater catchments |
topic_facet |
dissolved nitrogen active layer detachment precipitation nitrate high arctic Environmental sciences GE1-350 Environmental engineering TA170-171 |
description |
This study investigates the impacts of active layer detachments (ALDs) on nitrogen in seasonal runoff from High Arctic hillslope catchments. We examined dissolved nitrogen in runoff from an undisturbed catchment (Goose (GS)) and one that was disturbed (Ptarmigan (PT)) by ALDs, prior to disturbance (2007) and 5 years after disturbance (2012). The seasonal dynamics of nitrogen species concentrations and fluxes were similar in both catchments in 2007, but the mean seasonal nitrate concentration and mass flux from the disturbed catchment were on the order of 30 times higher relative to the undisturbed catchment in 2012. Stormflow yielded 45% and 60% of the 2012 total dissolved nitrogen flux in GS and PT, respectively, although rainfall runoff provided less than 25% of seasonal discharge. Results support that through the combined effects of increased disturbance and rainfall, climate change stands to significantly enhance the export of nitrate from High Arctic watersheds. This study highlights that the increase in the delivery of nitrate from disturbance is especially pronounced late in the season when downstream productivity and the biological demand for this often limiting nutrient are high. Our results also demonstrate that the impact of ALDs on nitrate export can persist more than 5 years following disturbance. |
format |
Article in Journal/Newspaper |
author |
Melissa J. Lafrenière Nicole L. Louiseize Scott F. Lamoureux |
author_facet |
Melissa J. Lafrenière Nicole L. Louiseize Scott F. Lamoureux |
author_sort |
Melissa J. Lafrenière |
title |
Active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from High Arctic headwater catchments |
title_short |
Active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from High Arctic headwater catchments |
title_full |
Active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from High Arctic headwater catchments |
title_fullStr |
Active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from High Arctic headwater catchments |
title_full_unstemmed |
Active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from High Arctic headwater catchments |
title_sort |
active layer slope disturbances affect seasonality and composition of dissolved nitrogen export from high arctic headwater catchments |
publisher |
Canadian Science Publishing |
publishDate |
2017 |
url |
https://doi.org/10.1139/as-2015-0009 https://doaj.org/article/4735fcf8b8c84a16a7d2e58a499c4276 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic Climate change |
genre_facet |
Arctic Arctic Climate change |
op_source |
Arctic Science, Vol 3, Iss 2, Pp 429-450 (2017) |
op_relation |
https://doi.org/10.1139/as-2015-0009 https://doaj.org/toc/2368-7460 doi:10.1139/as-2015-0009 2368-7460 https://doaj.org/article/4735fcf8b8c84a16a7d2e58a499c4276 |
op_doi |
https://doi.org/10.1139/as-2015-0009 |
container_title |
Arctic Science |
container_volume |
3 |
container_issue |
2 |
container_start_page |
429 |
op_container_end_page |
450 |
_version_ |
1766296181288206336 |