Year-round simulated methane emissions from a permafrost ecosystem in Northeast Siberia
Wetlands of northern high latitudes are ecosystems highly vulnerable to climate change. Some degradation effects include soil hydrologic changes due to permafrost thaw, formation of deeper active layers, and rising topsoil temperatures that accelerate the degradation of permafrost carbon and increas...
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Online Access: | https://doi.org/10.5194/bg-15-2691-2018 https://www.biogeosciences.net/15/2691/2018/ |
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ftcopernicus:oai:publications.copernicus.org:bg60447 2023-05-15T15:11:51+02:00 Year-round simulated methane emissions from a permafrost ecosystem in Northeast Siberia Castro-Morales, Karel Kleinen, Thomas Kaiser, Sonja Zaehle, Sönke Kittler, Fanny Kwon, Min Jung Beer, Christian Göckede, Mathias 2019-02-01 info:eu-repo/semantics/application/pdf https://doi.org/10.5194/bg-15-2691-2018 https://www.biogeosciences.net/15/2691/2018/ eng eng info:eu-repo/grantAgreement/EC/FP7/282700 info:eu-repo/grantAgreement/EC/FP7/333796 doi:10.5194/bg-15-2691-2018 https://www.biogeosciences.net/15/2691/2018/ info:eu-repo/semantics/openAccess eISSN: 1726-4189 info:eu-repo/semantics/Text 2019 ftcopernicus https://doi.org/10.5194/bg-15-2691-2018 2019-12-24T09:50:20Z Wetlands of northern high latitudes are ecosystems highly vulnerable to climate change. Some degradation effects include soil hydrologic changes due to permafrost thaw, formation of deeper active layers, and rising topsoil temperatures that accelerate the degradation of permafrost carbon and increase in CO 2 and CH 4 emissions. In this work we present 2 years of modeled year-round CH 4 emissions into the atmosphere from a Northeast Siberian region in the Russian Far East. We use a revisited version of the process-based JSBACH-methane model that includes four CH 4 transport pathways: plant-mediated transport, ebullition and molecular diffusion in the presence or absence of snow. The gas is emitted through wetlands represented by grid cell inundated areas simulated with a TOPMODEL approach. The magnitude of the summertime modeled CH 4 emissions is comparable to ground-based CH 4 fluxes measured with the eddy covariance technique and flux chambers in the same area of study, whereas wintertime modeled values are underestimated by 1 order of magnitude. In an annual balance, the most important mechanism for transport of methane into the atmosphere is through plants (61 %). This is followed by ebullition ( ∼ 35 %), while summertime molecular diffusion is negligible (0.02 %) compared to the diffusion through the snow during winter ( ∼ 4 %). We investigate the relationship between temporal changes in the CH 4 fluxes, soil temperature, and soil moisture content. Our results highlight the heterogeneity in CH 4 emissions at landscape scale and suggest that further improvements to the representation of large-scale hydrological conditions in the model will facilitate a more process-oriented land surface scheme and better simulate CH 4 emissions under climate change. This is especially necessary at regional scales in Arctic ecosystems influenced by permafrost thaw. Other/Unknown Material Arctic Climate change permafrost Siberia Copernicus Publications: E-Journals Arctic Biogeosciences 15 9 2691 2722 |
institution |
Open Polar |
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Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Wetlands of northern high latitudes are ecosystems highly vulnerable to climate change. Some degradation effects include soil hydrologic changes due to permafrost thaw, formation of deeper active layers, and rising topsoil temperatures that accelerate the degradation of permafrost carbon and increase in CO 2 and CH 4 emissions. In this work we present 2 years of modeled year-round CH 4 emissions into the atmosphere from a Northeast Siberian region in the Russian Far East. We use a revisited version of the process-based JSBACH-methane model that includes four CH 4 transport pathways: plant-mediated transport, ebullition and molecular diffusion in the presence or absence of snow. The gas is emitted through wetlands represented by grid cell inundated areas simulated with a TOPMODEL approach. The magnitude of the summertime modeled CH 4 emissions is comparable to ground-based CH 4 fluxes measured with the eddy covariance technique and flux chambers in the same area of study, whereas wintertime modeled values are underestimated by 1 order of magnitude. In an annual balance, the most important mechanism for transport of methane into the atmosphere is through plants (61 %). This is followed by ebullition ( ∼ 35 %), while summertime molecular diffusion is negligible (0.02 %) compared to the diffusion through the snow during winter ( ∼ 4 %). We investigate the relationship between temporal changes in the CH 4 fluxes, soil temperature, and soil moisture content. Our results highlight the heterogeneity in CH 4 emissions at landscape scale and suggest that further improvements to the representation of large-scale hydrological conditions in the model will facilitate a more process-oriented land surface scheme and better simulate CH 4 emissions under climate change. This is especially necessary at regional scales in Arctic ecosystems influenced by permafrost thaw. |
format |
Other/Unknown Material |
author |
Castro-Morales, Karel Kleinen, Thomas Kaiser, Sonja Zaehle, Sönke Kittler, Fanny Kwon, Min Jung Beer, Christian Göckede, Mathias |
spellingShingle |
Castro-Morales, Karel Kleinen, Thomas Kaiser, Sonja Zaehle, Sönke Kittler, Fanny Kwon, Min Jung Beer, Christian Göckede, Mathias Year-round simulated methane emissions from a permafrost ecosystem in Northeast Siberia |
author_facet |
Castro-Morales, Karel Kleinen, Thomas Kaiser, Sonja Zaehle, Sönke Kittler, Fanny Kwon, Min Jung Beer, Christian Göckede, Mathias |
author_sort |
Castro-Morales, Karel |
title |
Year-round simulated methane emissions from a permafrost ecosystem in Northeast Siberia |
title_short |
Year-round simulated methane emissions from a permafrost ecosystem in Northeast Siberia |
title_full |
Year-round simulated methane emissions from a permafrost ecosystem in Northeast Siberia |
title_fullStr |
Year-round simulated methane emissions from a permafrost ecosystem in Northeast Siberia |
title_full_unstemmed |
Year-round simulated methane emissions from a permafrost ecosystem in Northeast Siberia |
title_sort |
year-round simulated methane emissions from a permafrost ecosystem in northeast siberia |
publishDate |
2019 |
url |
https://doi.org/10.5194/bg-15-2691-2018 https://www.biogeosciences.net/15/2691/2018/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost Siberia |
genre_facet |
Arctic Climate change permafrost Siberia |
op_source |
eISSN: 1726-4189 |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/282700 info:eu-repo/grantAgreement/EC/FP7/333796 doi:10.5194/bg-15-2691-2018 https://www.biogeosciences.net/15/2691/2018/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-15-2691-2018 |
container_title |
Biogeosciences |
container_volume |
15 |
container_issue |
9 |
container_start_page |
2691 |
op_container_end_page |
2722 |
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1766342631850246144 |