Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope, Alaska : potential impacts on headwater stream ecosystems
Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 113 (2008): G02026, doi:10.1029/2007JG000470. Permafrost is a...
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Online Access: | https://hdl.handle.net/1912/3507 |
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/3507 2023-05-15T15:02:07+02:00 Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope, Alaska : potential impacts on headwater stream ecosystems Bowden, William B. Gooseff, Michael N. Balser, A. Green, A. Peterson, Bruce J. Bradford, J. 2008-06-03 application/pdf https://hdl.handle.net/1912/3507 en_US eng American Geophysical Union https://doi.org/10.1029/2007JG000470 Journal of Geophysical Research 113 (2008): G02026 https://hdl.handle.net/1912/3507 doi:10.1029/2007JG000470 Journal of Geophysical Research 113 (2008): G02026 doi:10.1029/2007JG000470 Arctic Climate change Streams Ecosystem dynamics Sediment Thermokarst Water quality Article 2008 ftwhoas https://doi.org/10.1029/2007JG000470 2022-05-28T22:57:58Z Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 113 (2008): G02026, doi:10.1029/2007JG000470. Permafrost is a defining characteristic of the Arctic environment. However, climate warming is thawing permafrost in many areas leading to failures in soil structure called thermokarst. An extensive survey of a 600 km2 area in and around the Toolik Lake Natural Research Area (TLNRA) revealed at least 34 thermokarst features, two thirds of which were new since ∼1980 when a high resolution aerial survey of the area was done. Most of these thermokarst features were associated with headwater streams or lakes. We have measured significantly increased sediment and nutrient loading from thermokarst features to streams in two well-studied locations near the TLNRA. One small thermokarst gully that formed in 2003 on the Toolik River in a 0.9 km2 subcatchment delivered more sediment to the river than is normally delivered in 18 years from 132 km2 in the adjacent upper Kuparuk River basin (a long-term monitoring reference site). Ammonium, nitrate, and phosphate concentrations downstream from a thermokarst feature on Imnavait Creek increased significantly compared to upstream reference concentrations and the increased concentrations persisted over the period of sampling (1999–2005). The downstream concentrations were similar to those we have used in a long-term experimental manipulation of the Kuparuk River and that have significantly altered the structure and function of that river. A subsampling of other thermokarst features from the extensive regional survey showed that concentrations of ammonium, nitrate, and phosphate were always higher downstream of the thermokarst features. Our previous research has shown that even minor increases in nutrient loading stimulate primary and secondary production. However, increased sediment loading could ... Article in Journal/Newspaper Arctic Climate change north slope permafrost Thermokarst Alaska Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Journal of Geophysical Research: Biogeosciences 113 G2 n/a n/a |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Arctic Climate change Streams Ecosystem dynamics Sediment Thermokarst Water quality |
spellingShingle |
Arctic Climate change Streams Ecosystem dynamics Sediment Thermokarst Water quality Bowden, William B. Gooseff, Michael N. Balser, A. Green, A. Peterson, Bruce J. Bradford, J. Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope, Alaska : potential impacts on headwater stream ecosystems |
topic_facet |
Arctic Climate change Streams Ecosystem dynamics Sediment Thermokarst Water quality |
description |
Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 113 (2008): G02026, doi:10.1029/2007JG000470. Permafrost is a defining characteristic of the Arctic environment. However, climate warming is thawing permafrost in many areas leading to failures in soil structure called thermokarst. An extensive survey of a 600 km2 area in and around the Toolik Lake Natural Research Area (TLNRA) revealed at least 34 thermokarst features, two thirds of which were new since ∼1980 when a high resolution aerial survey of the area was done. Most of these thermokarst features were associated with headwater streams or lakes. We have measured significantly increased sediment and nutrient loading from thermokarst features to streams in two well-studied locations near the TLNRA. One small thermokarst gully that formed in 2003 on the Toolik River in a 0.9 km2 subcatchment delivered more sediment to the river than is normally delivered in 18 years from 132 km2 in the adjacent upper Kuparuk River basin (a long-term monitoring reference site). Ammonium, nitrate, and phosphate concentrations downstream from a thermokarst feature on Imnavait Creek increased significantly compared to upstream reference concentrations and the increased concentrations persisted over the period of sampling (1999–2005). The downstream concentrations were similar to those we have used in a long-term experimental manipulation of the Kuparuk River and that have significantly altered the structure and function of that river. A subsampling of other thermokarst features from the extensive regional survey showed that concentrations of ammonium, nitrate, and phosphate were always higher downstream of the thermokarst features. Our previous research has shown that even minor increases in nutrient loading stimulate primary and secondary production. However, increased sediment loading could ... |
format |
Article in Journal/Newspaper |
author |
Bowden, William B. Gooseff, Michael N. Balser, A. Green, A. Peterson, Bruce J. Bradford, J. |
author_facet |
Bowden, William B. Gooseff, Michael N. Balser, A. Green, A. Peterson, Bruce J. Bradford, J. |
author_sort |
Bowden, William B. |
title |
Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope, Alaska : potential impacts on headwater stream ecosystems |
title_short |
Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope, Alaska : potential impacts on headwater stream ecosystems |
title_full |
Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope, Alaska : potential impacts on headwater stream ecosystems |
title_fullStr |
Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope, Alaska : potential impacts on headwater stream ecosystems |
title_full_unstemmed |
Sediment and nutrient delivery from thermokarst features in the foothills of the North Slope, Alaska : potential impacts on headwater stream ecosystems |
title_sort |
sediment and nutrient delivery from thermokarst features in the foothills of the north slope, alaska : potential impacts on headwater stream ecosystems |
publisher |
American Geophysical Union |
publishDate |
2008 |
url |
https://hdl.handle.net/1912/3507 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change north slope permafrost Thermokarst Alaska |
genre_facet |
Arctic Climate change north slope permafrost Thermokarst Alaska |
op_source |
Journal of Geophysical Research 113 (2008): G02026 doi:10.1029/2007JG000470 |
op_relation |
https://doi.org/10.1029/2007JG000470 Journal of Geophysical Research 113 (2008): G02026 https://hdl.handle.net/1912/3507 doi:10.1029/2007JG000470 |
op_doi |
https://doi.org/10.1029/2007JG000470 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
113 |
container_issue |
G2 |
container_start_page |
n/a |
op_container_end_page |
n/a |
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1766334102464626688 |