Organic Carbon and Nitrogen Stocks Along a Thermokarst Lake Sequence in Arctic Alaska
Thermokarst lake landscapes are permafrost regions, which are prone to rapid (on seasonal to decadal time scales) changes, affecting carbon and nitrogen cycles. However, there is a high degree of uncertainty related to the balance between carbon and nitrogen cycling and storage. We collected 12 perm...
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Online Access: | http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6618060/ http://www.ncbi.nlm.nih.gov/pubmed/31341754 https://doi.org/10.1029/2018JG004591 |
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ftpubmed:oai:pubmedcentral.nih.gov:6618060 2023-05-15T15:11:07+02:00 Organic Carbon and Nitrogen Stocks Along a Thermokarst Lake Sequence in Arctic Alaska Fuchs, Matthias Lenz, Josefine Jock, Suzanne Nitze, Ingmar Jones, Benjamin M. Strauss, Jens Günther, Frank Grosse, Guido 2019-05-15 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6618060/ http://www.ncbi.nlm.nih.gov/pubmed/31341754 https://doi.org/10.1029/2018JG004591 en eng John Wiley and Sons Inc. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6618060/ http://www.ncbi.nlm.nih.gov/pubmed/31341754 http://dx.doi.org/10.1029/2018JG004591 ©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. CC-BY-NC-ND Research Articles Text 2019 ftpubmed https://doi.org/10.1029/2018JG004591 2019-08-04T00:30:53Z Thermokarst lake landscapes are permafrost regions, which are prone to rapid (on seasonal to decadal time scales) changes, affecting carbon and nitrogen cycles. However, there is a high degree of uncertainty related to the balance between carbon and nitrogen cycling and storage. We collected 12 permafrost soil cores from six drained thermokarst lake basins (DTLBs) along a chronosequence north of Teshekpuk Lake in northern Alaska and analyzed them for carbon and nitrogen contents. For comparison, we included three lacustrine cores from an adjacent thermokarst lake and one soil core from a non thermokarst affected remnant upland. This allowed to calculate the carbon and nitrogen stocks of the three primary landscape units (DTLB, lake, and upland), to reconstruct the landscape history, and to analyze the effect of thermokarst lake formation and drainage on carbon and nitrogen stocks. We show that carbon and nitrogen contents and the carbon‐nitrogen ratio are considerably lower in sediments of extant lakes than in the DTLB or upland cores indicating degradation of carbon during thermokarst lake formation. However, we found similar amounts of total carbon and nitrogen stocks due to the higher density of lacustrine sediments caused by the lack of ground ice compared to DTLB sediments. In addition, the radiocarbon‐based landscape chronology for the past 7,000 years reveals five successive lake stages of partially, spatially overlapping DTLBs in the study region, reflecting the dynamic nature of ice‐rich permafrost deposits. With this study, we highlight the importance to include these dynamic landscapes in future permafrost carbon feedback models. Text Arctic Ice permafrost Thermokarst Alaska PubMed Central (PMC) Arctic Journal of Geophysical Research: Biogeosciences 124 5 1230 1247 |
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Research Articles |
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Research Articles Fuchs, Matthias Lenz, Josefine Jock, Suzanne Nitze, Ingmar Jones, Benjamin M. Strauss, Jens Günther, Frank Grosse, Guido Organic Carbon and Nitrogen Stocks Along a Thermokarst Lake Sequence in Arctic Alaska |
topic_facet |
Research Articles |
description |
Thermokarst lake landscapes are permafrost regions, which are prone to rapid (on seasonal to decadal time scales) changes, affecting carbon and nitrogen cycles. However, there is a high degree of uncertainty related to the balance between carbon and nitrogen cycling and storage. We collected 12 permafrost soil cores from six drained thermokarst lake basins (DTLBs) along a chronosequence north of Teshekpuk Lake in northern Alaska and analyzed them for carbon and nitrogen contents. For comparison, we included three lacustrine cores from an adjacent thermokarst lake and one soil core from a non thermokarst affected remnant upland. This allowed to calculate the carbon and nitrogen stocks of the three primary landscape units (DTLB, lake, and upland), to reconstruct the landscape history, and to analyze the effect of thermokarst lake formation and drainage on carbon and nitrogen stocks. We show that carbon and nitrogen contents and the carbon‐nitrogen ratio are considerably lower in sediments of extant lakes than in the DTLB or upland cores indicating degradation of carbon during thermokarst lake formation. However, we found similar amounts of total carbon and nitrogen stocks due to the higher density of lacustrine sediments caused by the lack of ground ice compared to DTLB sediments. In addition, the radiocarbon‐based landscape chronology for the past 7,000 years reveals five successive lake stages of partially, spatially overlapping DTLBs in the study region, reflecting the dynamic nature of ice‐rich permafrost deposits. With this study, we highlight the importance to include these dynamic landscapes in future permafrost carbon feedback models. |
format |
Text |
author |
Fuchs, Matthias Lenz, Josefine Jock, Suzanne Nitze, Ingmar Jones, Benjamin M. Strauss, Jens Günther, Frank Grosse, Guido |
author_facet |
Fuchs, Matthias Lenz, Josefine Jock, Suzanne Nitze, Ingmar Jones, Benjamin M. Strauss, Jens Günther, Frank Grosse, Guido |
author_sort |
Fuchs, Matthias |
title |
Organic Carbon and Nitrogen Stocks Along a Thermokarst Lake Sequence in Arctic Alaska |
title_short |
Organic Carbon and Nitrogen Stocks Along a Thermokarst Lake Sequence in Arctic Alaska |
title_full |
Organic Carbon and Nitrogen Stocks Along a Thermokarst Lake Sequence in Arctic Alaska |
title_fullStr |
Organic Carbon and Nitrogen Stocks Along a Thermokarst Lake Sequence in Arctic Alaska |
title_full_unstemmed |
Organic Carbon and Nitrogen Stocks Along a Thermokarst Lake Sequence in Arctic Alaska |
title_sort |
organic carbon and nitrogen stocks along a thermokarst lake sequence in arctic alaska |
publisher |
John Wiley and Sons Inc. |
publishDate |
2019 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6618060/ http://www.ncbi.nlm.nih.gov/pubmed/31341754 https://doi.org/10.1029/2018JG004591 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Thermokarst Alaska |
genre_facet |
Arctic Ice permafrost Thermokarst Alaska |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6618060/ http://www.ncbi.nlm.nih.gov/pubmed/31341754 http://dx.doi.org/10.1029/2018JG004591 |
op_rights |
©2019. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made. |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2018JG004591 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
124 |
container_issue |
5 |
container_start_page |
1230 |
op_container_end_page |
1247 |
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1766342020360568832 |