Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia
The currently observed climate warming will lead to substantial permafrost degradation and mobilization of formerly freeze-locked matter. Based on recent findings, we assume that there are substantial stocks of inorganic nitrogen (N) within the perennially frozen ground of arctic ecosystems. We stud...
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ftcopernicus:oai:publications.copernicus.org:bgd50631 2023-05-15T13:03:23+02:00 Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia Beermann, Fabian Langer, Moritz Wetterich, Sebastian Strauss, Jens Boike, Julia Fiencke, Claudia Schirrmeister, Lutz Pfeiffer, Eva-Maria Kutzbach, Lars 2018-09-26 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/bg-2016-117 https://www.biogeosciences-discuss.net/bg-2016-117/ eng eng info:eu-repo/grantAgreement/EC/FP7/282700 doi:10.5194/bg-2016-117 https://www.biogeosciences-discuss.net/bg-2016-117/ info:eu-repo/semantics/openAccess eISSN: 1726-4189 info:eu-repo/semantics/Text 2018 ftcopernicus https://doi.org/10.5194/bg-2016-117 2019-12-24T09:52:39Z The currently observed climate warming will lead to substantial permafrost degradation and mobilization of formerly freeze-locked matter. Based on recent findings, we assume that there are substantial stocks of inorganic nitrogen (N) within the perennially frozen ground of arctic ecosystems. We studied eleven soil profiles down to one meter depth below surface at three different sites in arctic eastern Siberia, covering polygonal tundra and river floodplains, to assess the amount of inorganic N stores in arctic permafrost-affected soils. Furthermore, we modeled the potential thickening of the seasonally unfrozen uppermost soil (active) layer for these sites, using the CryoGrid2 permafrost model and representation concentration pathway (RCP) 4.5 and 8.5 scenarios. The first scenario, RCP4.5, is a stabilization pathway that reaches plateau atmospheric carbon concentrations early in the 21 st century; the second, RCP8.5, is a business as usual emission scenario with increasing carbon emissions. The modeled increases in active layer thickness (ALT) were used to estimate potential annual N mobilization from permafrost-affected soils in the course of climate-induced active-layer deepening. We observed significant stores of inorganic ammonium in the perennially frozen ground of all investigated soils, up to 40-fold higher than in the active layer. The modeled ALT increase until 2100 under the RCP8.5 scenario was between 19 ± 3 cm and 35 ± 6 cm, depending on the location. Under the RCP4.5 scenario, the ALT remained stable in all investigated soils. Our estimated mean annual N release under the RCP8.5 scenario is between 8 ± 3 mg m −2 and 81 ± 14 mg m −2 for the different locations, which reaches values up to the order of magnitude of annual fixation of atmospheric N in arctic soils. However, the thawing induced release of N represents only a small flux in comparison with the overall ecosystem N cycling. Other/Unknown Material Active layer thickness Arctic permafrost Tundra Siberia Copernicus Publications: E-Journals Arctic |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
The currently observed climate warming will lead to substantial permafrost degradation and mobilization of formerly freeze-locked matter. Based on recent findings, we assume that there are substantial stocks of inorganic nitrogen (N) within the perennially frozen ground of arctic ecosystems. We studied eleven soil profiles down to one meter depth below surface at three different sites in arctic eastern Siberia, covering polygonal tundra and river floodplains, to assess the amount of inorganic N stores in arctic permafrost-affected soils. Furthermore, we modeled the potential thickening of the seasonally unfrozen uppermost soil (active) layer for these sites, using the CryoGrid2 permafrost model and representation concentration pathway (RCP) 4.5 and 8.5 scenarios. The first scenario, RCP4.5, is a stabilization pathway that reaches plateau atmospheric carbon concentrations early in the 21 st century; the second, RCP8.5, is a business as usual emission scenario with increasing carbon emissions. The modeled increases in active layer thickness (ALT) were used to estimate potential annual N mobilization from permafrost-affected soils in the course of climate-induced active-layer deepening. We observed significant stores of inorganic ammonium in the perennially frozen ground of all investigated soils, up to 40-fold higher than in the active layer. The modeled ALT increase until 2100 under the RCP8.5 scenario was between 19 ± 3 cm and 35 ± 6 cm, depending on the location. Under the RCP4.5 scenario, the ALT remained stable in all investigated soils. Our estimated mean annual N release under the RCP8.5 scenario is between 8 ± 3 mg m −2 and 81 ± 14 mg m −2 for the different locations, which reaches values up to the order of magnitude of annual fixation of atmospheric N in arctic soils. However, the thawing induced release of N represents only a small flux in comparison with the overall ecosystem N cycling. |
format |
Other/Unknown Material |
author |
Beermann, Fabian Langer, Moritz Wetterich, Sebastian Strauss, Jens Boike, Julia Fiencke, Claudia Schirrmeister, Lutz Pfeiffer, Eva-Maria Kutzbach, Lars |
spellingShingle |
Beermann, Fabian Langer, Moritz Wetterich, Sebastian Strauss, Jens Boike, Julia Fiencke, Claudia Schirrmeister, Lutz Pfeiffer, Eva-Maria Kutzbach, Lars Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia |
author_facet |
Beermann, Fabian Langer, Moritz Wetterich, Sebastian Strauss, Jens Boike, Julia Fiencke, Claudia Schirrmeister, Lutz Pfeiffer, Eva-Maria Kutzbach, Lars |
author_sort |
Beermann, Fabian |
title |
Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia |
title_short |
Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia |
title_full |
Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia |
title_fullStr |
Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia |
title_full_unstemmed |
Permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern Siberia |
title_sort |
permafrost thaw and release of inorganic nitrogen from polygonal tundra soils in eastern siberia |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-2016-117 https://www.biogeosciences-discuss.net/bg-2016-117/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Active layer thickness Arctic permafrost Tundra Siberia |
genre_facet |
Active layer thickness Arctic permafrost Tundra Siberia |
op_source |
eISSN: 1726-4189 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/282700 doi:10.5194/bg-2016-117 https://www.biogeosciences-discuss.net/bg-2016-117/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-2016-117 |
_version_ |
1766335569428742144 |