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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ftcopernicus:oai:publications.copernicus.org:bg58774 2023-05-15T15:14:56+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 2018-09-27 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/bg-15-953-2018 https://www.biogeosciences.net/15/953/2018/ eng eng info:eu-repo/grantAgreement/EC/FP7/338335 doi:10.5194/bg-15-953-2018 https://www.biogeosciences.net/15/953/2018/ info:eu-repo/semantics/openAccess eISSN: 1726-4189 info:eu-repo/semantics/Text 2018 ftcopernicus https://doi.org/10.5194/bg-15-953-2018 2019-12-24T09:50:38Z 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 3 m 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 Holocene-age 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 ∼ 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. Other/Unknown Material Arctic Ice permafrost Thermokarst Siberia Copernicus Publications: E-Journals Arctic Biogeosciences 15 3 953 971 |
institution |
Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
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 3 m 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 Holocene-age 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 ∼ 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 |
Other/Unknown Material |
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 |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-953-2018 https://www.biogeosciences.net/15/953/2018/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Thermokarst Siberia |
genre_facet |
Arctic Ice permafrost Thermokarst Siberia |
op_source |
eISSN: 1726-4189 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/338335 doi:10.5194/bg-15-953-2018 https://www.biogeosciences.net/15/953/2018/ |
op_rights |
info:eu-repo/semantics/openAccess |
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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1766345325127139328 |