Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic
Herschel Island, located in the southern Beaufort Sea, Western Canadian Arctic, shows a clear response to the global warming. Due to its ice-rich permafrost it is highly affected by environmental forcing and known for its high erosion rates and retrogressive thaw slump activity. Even though retrogre...
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ftawi:oai:epic.awi.de:40213 2024-09-15T17:50:38+00:00 Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic Ruttor, Saskia 2015-12-14 application/pdf https://epic.awi.de/id/eprint/40213/ https://epic.awi.de/id/eprint/40213/1/Masterarbeit_SaskiaRuttor.pdf https://hdl.handle.net/10013/epic.47348 https://hdl.handle.net/10013/epic.47348.d001 unknown https://epic.awi.de/id/eprint/40213/1/Masterarbeit_SaskiaRuttor.pdf https://hdl.handle.net/10013/epic.47348.d001 Ruttor, S. (2015) Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic Master thesis, hdl:10013/epic.47348 EPIC3 Thesis notRev 2015 ftawi 2024-06-24T04:14:20Z Herschel Island, located in the southern Beaufort Sea, Western Canadian Arctic, shows a clear response to the global warming. Due to its ice-rich permafrost it is highly affected by environmental forcing and known for its high erosion rates and retrogressive thaw slump activity. Even though retrogressive thaw slumps have an effect on carbon and nitrogen cycling, until now there is not much known about the processes and carbon and nitrogen availability within a retrogressive thaw slump at a circumarctic scale. To provide new insides in this particular field, the retrogressive thaw slump “Slump D” on Herschel Island was divided into undisturbed (tundra zone, permafrost zone), and disturbed zones (mud pool zone, slump floor zone) and sampled via a fishnet grid. The tundra, mud pool and slump floor zones were sampled at 0 to 30 cm depth, for the permafrost zone permafrost profiles of up to 340 cm depth were sampled. In total 100 samples were analysed in their biogeochemical parameters (total organic carbon(TOC)-, total carbon(TC)-, total nitrogen(TN)-content) and stable isotope content (δ13Corg). The organic carbon source was determined for all zones to illustrate eventual differences in the deposition milieu. To show the degree of decomposition and degradation during the slumping process TOC/TN-ratio and δ13Corg were used as proxys. The results show that the tundra zone has the highest TC-, TOC- and TN-values follwed by the permafrost zone. The lowest values are determined for the slump floor and the mud pool zone. All of the zones show similar δ13Corg-values of -26.9‰but obvious differences in the TOC/TN-ratio. From the results it is concluded that the tundra zone shows a higher degradation than the permafrost zone but less than the mud pool and slump floor zone. Based on the high TOC/TN-values for the permafrost zone a vulnerable zone where carbon and nitrogen is available for decomposition during thawing processes is indicated. Due to the better quality of the organic matter within the permafrost zone labile ... Thesis Arctic Beaufort Sea Global warming Herschel Herschel Island Ice permafrost Tundra Yukon Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Herschel Island, located in the southern Beaufort Sea, Western Canadian Arctic, shows a clear response to the global warming. Due to its ice-rich permafrost it is highly affected by environmental forcing and known for its high erosion rates and retrogressive thaw slump activity. Even though retrogressive thaw slumps have an effect on carbon and nitrogen cycling, until now there is not much known about the processes and carbon and nitrogen availability within a retrogressive thaw slump at a circumarctic scale. To provide new insides in this particular field, the retrogressive thaw slump “Slump D” on Herschel Island was divided into undisturbed (tundra zone, permafrost zone), and disturbed zones (mud pool zone, slump floor zone) and sampled via a fishnet grid. The tundra, mud pool and slump floor zones were sampled at 0 to 30 cm depth, for the permafrost zone permafrost profiles of up to 340 cm depth were sampled. In total 100 samples were analysed in their biogeochemical parameters (total organic carbon(TOC)-, total carbon(TC)-, total nitrogen(TN)-content) and stable isotope content (δ13Corg). The organic carbon source was determined for all zones to illustrate eventual differences in the deposition milieu. To show the degree of decomposition and degradation during the slumping process TOC/TN-ratio and δ13Corg were used as proxys. The results show that the tundra zone has the highest TC-, TOC- and TN-values follwed by the permafrost zone. The lowest values are determined for the slump floor and the mud pool zone. All of the zones show similar δ13Corg-values of -26.9‰but obvious differences in the TOC/TN-ratio. From the results it is concluded that the tundra zone shows a higher degradation than the permafrost zone but less than the mud pool and slump floor zone. Based on the high TOC/TN-values for the permafrost zone a vulnerable zone where carbon and nitrogen is available for decomposition during thawing processes is indicated. Due to the better quality of the organic matter within the permafrost zone labile ... |
format |
Thesis |
author |
Ruttor, Saskia |
spellingShingle |
Ruttor, Saskia Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic |
author_facet |
Ruttor, Saskia |
author_sort |
Ruttor, Saskia |
title |
Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic |
title_short |
Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic |
title_full |
Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic |
title_fullStr |
Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic |
title_full_unstemmed |
Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic |
title_sort |
mobilization of organic carbon and nitrogen in a retrogressive thaw slump on herschel island, yukon territory, western canadian arctic |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/40213/ https://epic.awi.de/id/eprint/40213/1/Masterarbeit_SaskiaRuttor.pdf https://hdl.handle.net/10013/epic.47348 https://hdl.handle.net/10013/epic.47348.d001 |
genre |
Arctic Beaufort Sea Global warming Herschel Herschel Island Ice permafrost Tundra Yukon |
genre_facet |
Arctic Beaufort Sea Global warming Herschel Herschel Island Ice permafrost Tundra Yukon |
op_source |
EPIC3 |
op_relation |
https://epic.awi.de/id/eprint/40213/1/Masterarbeit_SaskiaRuttor.pdf https://hdl.handle.net/10013/epic.47348.d001 Ruttor, S. (2015) Mobilization of organic carbon and nitrogen in a retrogressive thaw slump on Herschel Island, Yukon Territory, Western Canadian Arctic Master thesis, hdl:10013/epic.47348 |
_version_ |
1810292439008673792 |