How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia
Thermokarst lagoons, forming when thermokarst lakes are inundated by the sea, are an transition stage where terrestrial permafrost is introduced into the subsea realm. Here, permafrost and lacustrine carbon pools are transformed along Arctic coasts. During thaw previously frozen organic carbon can b...
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ftawi:oai:epic.awi.de:55720 2023-05-15T15:01:59+02:00 How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia Jenrich, Maren Liebner, Susanne Knoblauch, Christian Jongejans, Loeka L. Tanski, George Grigoriev, Mikhail N. Grosse, Guido Strauss, Jens 2021-10 application/pdf https://epic.awi.de/id/eprint/55720/ https://epic.awi.de/id/eprint/55720/1/Poster_MJenrich_RCOP2021_final.pdf https://hdl.handle.net/10013/epic.8be29af4-b93c-46af-918a-2d1479d91adb https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/55720/1/Poster_MJenrich_RCOP2021_final.pdf https://hdl.handle.net/ Jenrich, M. orcid:0000-0002-1330-7461 , Liebner, S. orcid:0000-0002-9389-7093 , Knoblauch, C. orcid:0000-0002-7147-1008 , Jongejans, L. L. orcid:0000-0002-0383-4567 , Tanski, G. orcid:0000-0002-2992-2071 , Grigoriev, M. N. orcid:0000-0003-1997-9506 , Grosse, G. orcid:0000-0001-5895-2141 and Strauss, J. orcid:0000-0003-4678-4982 (2021) How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia , 2021 Regional Conference on Permafrost (RCOP21), online, 24 October 2021 - 29 October 2021 . hdl:10013/epic.8be29af4-b93c-46af-918a-2d1479d91adb EPIC32021 Regional Conference on Permafrost (RCOP21), online, 2021-10-24-2021-10-29 Conference notRev 2021 ftawi 2022-03-14T00:09:43Z Thermokarst lagoons, forming when thermokarst lakes are inundated by the sea, are an transition stage where terrestrial permafrost is introduced into the subsea realm. Here, permafrost and lacustrine carbon pools are transformed along Arctic coasts. During thaw previously frozen organic carbon can be converted into the greenhouse gases (GHG) carbon dioxide (CO2) and methane by microorganisms and leading to further climate warming. Especially for transition ecosystems like thermokarst lagoons it is largely unknown how GHG release is changing and whether thermokarst lagoons are a carbon source or sink. For getting a first glimpse of the consequences of saltwater inundation, we mimic the inundation of coastal permafrost in an experiment by incubating permafrost and thermokarst samples with artificial sea water under controlled conditions (4°C, dark, anaerobic) for 12 month. We used terrestrial samples from a 2.5 m high Yedoma outcrop, a thermokarst lake core, as well as samples from two neighboring thermokarst lagoons (a nearly-closed and a semi-closed) from the Bykovsky Peninsula, Northeast Siberia. By applying two different scenarios we aim to estimate (1) future GHG releases from newly formed Arctic lagoons by adding artificial seawater with a constant concentration and (2) the impact of increasing salinity on GHG production by incubating the samples under freshwater, brackish and marine conditions. Here we present (1) total organic carbon and dissolved organic carbon content for deep-drilled sediment cores (~ 30m) and (2) preliminary results on GHG production (methane and CO2) rates measured over 6 month. First results show that (1) GHG production is higher for inundated terrestrial sediments than for inundated lagoon sediments and (2) increasing salinity is favoring carbon dioxide production while methane production is low. In conclusion newly formed thermokarst lagoons, if upscaled to the thermokarst affected shorelines, are likely produce a significant amount of GHG under our experiment set-up. Conference Object Arctic permafrost Thermokarst Siberia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Thermokarst lagoons, forming when thermokarst lakes are inundated by the sea, are an transition stage where terrestrial permafrost is introduced into the subsea realm. Here, permafrost and lacustrine carbon pools are transformed along Arctic coasts. During thaw previously frozen organic carbon can be converted into the greenhouse gases (GHG) carbon dioxide (CO2) and methane by microorganisms and leading to further climate warming. Especially for transition ecosystems like thermokarst lagoons it is largely unknown how GHG release is changing and whether thermokarst lagoons are a carbon source or sink. For getting a first glimpse of the consequences of saltwater inundation, we mimic the inundation of coastal permafrost in an experiment by incubating permafrost and thermokarst samples with artificial sea water under controlled conditions (4°C, dark, anaerobic) for 12 month. We used terrestrial samples from a 2.5 m high Yedoma outcrop, a thermokarst lake core, as well as samples from two neighboring thermokarst lagoons (a nearly-closed and a semi-closed) from the Bykovsky Peninsula, Northeast Siberia. By applying two different scenarios we aim to estimate (1) future GHG releases from newly formed Arctic lagoons by adding artificial seawater with a constant concentration and (2) the impact of increasing salinity on GHG production by incubating the samples under freshwater, brackish and marine conditions. Here we present (1) total organic carbon and dissolved organic carbon content for deep-drilled sediment cores (~ 30m) and (2) preliminary results on GHG production (methane and CO2) rates measured over 6 month. First results show that (1) GHG production is higher for inundated terrestrial sediments than for inundated lagoon sediments and (2) increasing salinity is favoring carbon dioxide production while methane production is low. In conclusion newly formed thermokarst lagoons, if upscaled to the thermokarst affected shorelines, are likely produce a significant amount of GHG under our experiment set-up. |
format |
Conference Object |
author |
Jenrich, Maren Liebner, Susanne Knoblauch, Christian Jongejans, Loeka L. Tanski, George Grigoriev, Mikhail N. Grosse, Guido Strauss, Jens |
spellingShingle |
Jenrich, Maren Liebner, Susanne Knoblauch, Christian Jongejans, Loeka L. Tanski, George Grigoriev, Mikhail N. Grosse, Guido Strauss, Jens How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia |
author_facet |
Jenrich, Maren Liebner, Susanne Knoblauch, Christian Jongejans, Loeka L. Tanski, George Grigoriev, Mikhail N. Grosse, Guido Strauss, Jens |
author_sort |
Jenrich, Maren |
title |
How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia |
title_short |
How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia |
title_full |
How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia |
title_fullStr |
How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia |
title_full_unstemmed |
How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia |
title_sort |
how is permafrost carbon affected by seawater inundation? - estimating greenhouse gas production in thermokarst lagoons of bykovsky peninsula, siberia |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/55720/ https://epic.awi.de/id/eprint/55720/1/Poster_MJenrich_RCOP2021_final.pdf https://hdl.handle.net/10013/epic.8be29af4-b93c-46af-918a-2d1479d91adb https://hdl.handle.net/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Thermokarst Siberia |
genre_facet |
Arctic permafrost Thermokarst Siberia |
op_source |
EPIC32021 Regional Conference on Permafrost (RCOP21), online, 2021-10-24-2021-10-29 |
op_relation |
https://epic.awi.de/id/eprint/55720/1/Poster_MJenrich_RCOP2021_final.pdf https://hdl.handle.net/ Jenrich, M. orcid:0000-0002-1330-7461 , Liebner, S. orcid:0000-0002-9389-7093 , Knoblauch, C. orcid:0000-0002-7147-1008 , Jongejans, L. L. orcid:0000-0002-0383-4567 , Tanski, G. orcid:0000-0002-2992-2071 , Grigoriev, M. N. orcid:0000-0003-1997-9506 , Grosse, G. orcid:0000-0001-5895-2141 and Strauss, J. orcid:0000-0003-4678-4982 (2021) How is permafrost carbon affected by seawater inundation? - Estimating greenhouse gas production in thermokarst lagoons of Bykovsky Peninsula, Siberia , 2021 Regional Conference on Permafrost (RCOP21), online, 24 October 2021 - 29 October 2021 . hdl:10013/epic.8be29af4-b93c-46af-918a-2d1479d91adb |
_version_ |
1766333984521846784 |