Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia
Ice-rich yedoma-dominated landscapes store considerable 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...
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ftubpotsdam:oai:kobv.de-opus4-uni-potsdam:53518 2023-05-15T15:14:06+02:00 Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia Fuchs, Matthias (Dr.) Grosse, Guido (Prof. Dr.) Strauss, Jens Günther, Frank Grigoriev, Mikhail N. Maximov, Georgy M. Hugelius, Gustaf 2018-02-16 https://publishup.uni-potsdam.de/frontdoor/index/index/docId/53518 https://doi.org/10.5194/bg-15-953-2018 eng eng https://publishup.uni-potsdam.de/frontdoor/index/index/docId/53518 https://doi.org/10.5194/bg-15-953-2018 https://creativecommons.org/licenses/by/3.0/de/ info:eu-repo/semantics/closedAccess CC-BY Institut für Geowissenschaften article doc-type:article 2018 ftubpotsdam https://doi.org/10.5194/bg-15-953-2018 2023-02-12T23:32:15Z Ice-rich yedoma-dominated landscapes store considerable 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 3m depth were collected along geomorphic gradients and analysed 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 understanding 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 Peninsula 25.9 kg C m(-2) and 2.2 kg N m(-2). Radiocarbon dating demonstrates the Holocene age of thermokarst basin deposits but also suggests the presence of thick Holoceneage cover layers which can reach up to 2 m on top of intact yedoma landforms. Reconstructed sedimentation rates of 0.10-0.57 mm yr(-1) suggest sustained mineral soil accumulation across all investigated landforms. Both yedoma and thermokarst landforms are characterized by limited accumulation of organic soil layers (peat). We further estimate that an active layer deepening of about 100 cm will increase organic C availability in a seasonally thawed state in the two study areas by similar to 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 account for high variability of permafrost and thermokarst environments in pan-permafrost soil C and N pool estimates. Article in Journal/Newspaper Arctic Ice permafrost Thermokarst Siberia University of Potsdam: publish.UP Arctic Biogeosciences 15 3 953 971 |
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University of Potsdam: publish.UP |
op_collection_id |
ftubpotsdam |
language |
English |
topic |
Institut für Geowissenschaften |
spellingShingle |
Institut für Geowissenschaften Fuchs, Matthias (Dr.) Grosse, Guido (Prof. Dr.) Strauss, Jens Günther, Frank Grigoriev, Mikhail N. Maximov, Georgy M. Hugelius, Gustaf Carbon and nitrogen pools in thermokarst-affected permafrost landscapes in Arctic Siberia |
topic_facet |
Institut für Geowissenschaften |
description |
Ice-rich yedoma-dominated landscapes store considerable 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 3m depth were collected along geomorphic gradients and analysed 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 understanding 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 Peninsula 25.9 kg C m(-2) and 2.2 kg N m(-2). Radiocarbon dating demonstrates the Holocene age of thermokarst basin deposits but also suggests the presence of thick Holoceneage cover layers which can reach up to 2 m on top of intact yedoma landforms. Reconstructed sedimentation rates of 0.10-0.57 mm yr(-1) suggest sustained mineral soil accumulation across all investigated landforms. Both yedoma and thermokarst landforms are characterized by limited accumulation of organic soil layers (peat). We further estimate that an active layer deepening of about 100 cm will increase organic C availability in a seasonally thawed state in the two study areas by similar to 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 account for high variability of permafrost and thermokarst environments in pan-permafrost soil C and N pool estimates. |
format |
Article in Journal/Newspaper |
author |
Fuchs, Matthias (Dr.) Grosse, Guido (Prof. Dr.) Strauss, Jens Günther, Frank Grigoriev, Mikhail N. Maximov, Georgy M. Hugelius, Gustaf |
author_facet |
Fuchs, Matthias (Dr.) Grosse, Guido (Prof. Dr.) Strauss, Jens Günther, Frank Grigoriev, Mikhail N. Maximov, Georgy M. Hugelius, Gustaf |
author_sort |
Fuchs, Matthias (Dr.) |
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 |
publishDate |
2018 |
url |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/53518 https://doi.org/10.5194/bg-15-953-2018 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Thermokarst Siberia |
genre_facet |
Arctic Ice permafrost Thermokarst Siberia |
op_relation |
https://publishup.uni-potsdam.de/frontdoor/index/index/docId/53518 https://doi.org/10.5194/bg-15-953-2018 |
op_rights |
https://creativecommons.org/licenses/by/3.0/de/ info:eu-repo/semantics/closedAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-15-953-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
3 |
container_start_page |
953 |
op_container_end_page |
971 |
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1766344602046955520 |