Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia
Ice-rich yedoma-dominated landscapes store con- siderable amounts of organic carbon (C) and nitrogen (N) and are vulnerable to degradation under climate warming. We investigate the C and N pools in two thermokarst-affected yedoma landscapes – on Sobo-Sise Island and on Bykovsky Peninsula in the nort...
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ftdatacite:10.25932/publishup-41802 2023-05-15T15:17:25+02:00 Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia Fuchs, Matthias Grosse, Guido Strauss, Jens Günther, Frank Grigoriev, Mikhail Maximov, Georgy M. Hugelius, Gustaf 2019 application/pdf application/zip https://dx.doi.org/10.25932/publishup-41802 https://publishup.uni-potsdam.de/41802 en eng Universität Potsdam Creative Commons - Namensnennung, 4.0 International https://creativecommons.org/licenses/by/4.0 CC-BY article-journal Text ScholarlyArticle 2019 ftdatacite https://doi.org/10.25932/publishup-41802 2021-11-05T12:55:41Z Ice-rich yedoma-dominated landscapes store con- siderable amounts of organic carbon (C) and nitrogen (N) and are vulnerable to degradation under climate warming. We investigate the C and N pools in two thermokarst-affected yedoma landscapes – on Sobo-Sise Island and on Bykovsky Peninsula in the north of eastern Siberia. Soil cores up to 3 m depth were collected along geomorphic gradients and anal- ysed for organic C and N contents. A high vertical sampling density in the profiles allowed the calculation of C and N stocks for short soil column intervals and enhanced under- standing of within-core parameter variability. Profile-level C and N stocks were scaled to the landscape level based on landform classifications from 5 m resolution, multispectral RapidEye satellite imagery. Mean landscape C and N storage in the first metre of soil for Sobo-Sise Island is estimated to be 20.2 kg C m −2 and 1.8 kg N m −2 and for Bykovsky Penin- sula 25.9 kg C m −2 and 2.2 kg N m −2 . Radiocarbon dating demonstrates the Holocene age of thermokarst basin de- posits but also suggests the presence of thick Holocene- age cover layers which can reach up to 2 m on top of in- tact yedoma landforms. Reconstructed sedimentation rates of 0.10–0.57 mm yr −1 suggest sustained mineral soil accu- mulation across all investigated landforms. Both yedoma and thermokarst landforms are characterized by limited accumu- lation of organic soil layers (peat). We further estimate that an active layer deepening of about 100 cm will increase organic C availability in a sea- sonally thawed state in the two study areas by ∼ 5.8 Tg (13.2 kg C m −2 ). Our study demonstrates the importance of increasing the number of C and N storage inventories in ice- rich yedoma and thermokarst environments in order to ac- count for high variability of permafrost and thermokarst en- vironments in pan-permafrost soil C and N pool estimates. : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 654 Text Arctic Ice permafrost Thermokarst Siberia DataCite Metadata Store (German National Library of Science and Technology) Arctic |
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Open Polar |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
language |
English |
description |
Ice-rich yedoma-dominated landscapes store con- siderable amounts of organic carbon (C) and nitrogen (N) and are vulnerable to degradation under climate warming. We investigate the C and N pools in two thermokarst-affected yedoma landscapes – on Sobo-Sise Island and on Bykovsky Peninsula in the north of eastern Siberia. Soil cores up to 3 m depth were collected along geomorphic gradients and anal- ysed for organic C and N contents. A high vertical sampling density in the profiles allowed the calculation of C and N stocks for short soil column intervals and enhanced under- standing of within-core parameter variability. Profile-level C and N stocks were scaled to the landscape level based on landform classifications from 5 m resolution, multispectral RapidEye satellite imagery. Mean landscape C and N storage in the first metre of soil for Sobo-Sise Island is estimated to be 20.2 kg C m −2 and 1.8 kg N m −2 and for Bykovsky Penin- sula 25.9 kg C m −2 and 2.2 kg N m −2 . Radiocarbon dating demonstrates the Holocene age of thermokarst basin de- posits but also suggests the presence of thick Holocene- age cover layers which can reach up to 2 m on top of in- tact yedoma landforms. Reconstructed sedimentation rates of 0.10–0.57 mm yr −1 suggest sustained mineral soil accu- mulation across all investigated landforms. Both yedoma and thermokarst landforms are characterized by limited accumu- lation of organic soil layers (peat). We further estimate that an active layer deepening of about 100 cm will increase organic C availability in a sea- sonally thawed state in the two study areas by ∼ 5.8 Tg (13.2 kg C m −2 ). Our study demonstrates the importance of increasing the number of C and N storage inventories in ice- rich yedoma and thermokarst environments in order to ac- count for high variability of permafrost and thermokarst en- vironments in pan-permafrost soil C and N pool estimates. : Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe, 654 |
format |
Text |
author |
Fuchs, Matthias Grosse, Guido Strauss, Jens Günther, Frank Grigoriev, Mikhail Maximov, Georgy M. Hugelius, Gustaf |
spellingShingle |
Fuchs, Matthias Grosse, Guido Strauss, Jens Günther, Frank Grigoriev, Mikhail Maximov, Georgy M. Hugelius, Gustaf Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia |
author_facet |
Fuchs, Matthias Grosse, Guido Strauss, Jens Günther, Frank Grigoriev, Mikhail Maximov, Georgy M. Hugelius, Gustaf |
author_sort |
Fuchs, Matthias |
title |
Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia |
title_short |
Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia |
title_full |
Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia |
title_fullStr |
Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia |
title_full_unstemmed |
Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia |
title_sort |
carbon and nitrogen pools in thermokarst-affected permafrost landscapes in arctic siberia |
publisher |
Universität Potsdam |
publishDate |
2019 |
url |
https://dx.doi.org/10.25932/publishup-41802 https://publishup.uni-potsdam.de/41802 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Thermokarst Siberia |
genre_facet |
Arctic Ice permafrost Thermokarst Siberia |
op_rights |
Creative Commons - Namensnennung, 4.0 International https://creativecommons.org/licenses/by/4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.25932/publishup-41802 |
_version_ |
1766347654798770176 |