Simulated methane emissions from Arctic ponds are highly sensitive to warming
The Arctic is warming at an above-average rate, and small, shallow waterbodies such as ponds are vulnerable to this warming due to their low thermal inertia compared to larger lakes. While ponds are a relevant landscape-scale source of methane under the current climate, the response of pond methane...
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ftpubman:oai:pure.mpg.de:item_3394320 2024-09-09T19:22:18+00:00 Simulated methane emissions from Arctic ponds are highly sensitive to warming Rehder, Z. Kleinen, T. Kutzbach, L. Stepanenko, V. Langer, M. Brovkin, V. 2023-07-17 application/zip application/pdf http://hdl.handle.net/21.11116/0000-000D-3868-0 http://hdl.handle.net/21.11116/0000-000D-386C-C http://hdl.handle.net/21.11116/0000-000D-7388-8 http://hdl.handle.net/21.11116/0000-000D-7389-7 eng eng info:eu-repo/grantAgreement/EC/H2020/951288 info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-20-2837-2023 http://hdl.handle.net/21.11116/0000-000D-3868-0 http://hdl.handle.net/21.11116/0000-000D-386C-C http://hdl.handle.net/21.11116/0000-000D-7388-8 http://hdl.handle.net/21.11116/0000-000D-7389-7 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Biogeosciences info:eu-repo/semantics/article 2023 ftpubman https://doi.org/10.5194/bg-20-2837-2023 2024-06-18T14:12:31Z The Arctic is warming at an above-average rate, and small, shallow waterbodies such as ponds are vulnerable to this warming due to their low thermal inertia compared to larger lakes. While ponds are a relevant landscape-scale source of methane under the current climate, the response of pond methane emissions to warming is uncertain. We employ a new, process-based model for methane emissions from ponds (MeEP) to investigate the methane emission response of polygonal-tundra ponds in northeastern Siberia to warming. MeEP is the first dedicated model of pond methane emissions which differentiates between the three main pond types of the polygonal-tundra, ice-wedge, polygonal-center, and merged polygonal ponds and resolves the three main pathways of methane emissions – diffusion, ebullition, and plant-mediated transport. We perform idealized warming experiments, with increases in the mean annual temperature of 2.5, 5, and 7.5 ∘C on top of a historical simulation. The simulations reveal an approximately linear increase in emissions from ponds of 1.33 g CH4 yr−1 ∘C−1 m−2 in this temperature range. Under annual temperatures 5 ∘C above present temperatures, pond methane emissions are more than 3 times higher than now. Most of this emission increase is due to the additional substrate provided by the increased net productivity of the vascular plants. Furthermore, plant-mediated transport is the dominating pathway of methane emissions in all simulations. We conclude that vascular plants as a substrate source and efficient methane pathway should be included in future pan-Arctic assessments of pond methane emissions Article in Journal/Newspaper Arctic Tundra Siberia Max Planck Society: MPG.PuRe Arctic Frontiers in Marine Science 5 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
The Arctic is warming at an above-average rate, and small, shallow waterbodies such as ponds are vulnerable to this warming due to their low thermal inertia compared to larger lakes. While ponds are a relevant landscape-scale source of methane under the current climate, the response of pond methane emissions to warming is uncertain. We employ a new, process-based model for methane emissions from ponds (MeEP) to investigate the methane emission response of polygonal-tundra ponds in northeastern Siberia to warming. MeEP is the first dedicated model of pond methane emissions which differentiates between the three main pond types of the polygonal-tundra, ice-wedge, polygonal-center, and merged polygonal ponds and resolves the three main pathways of methane emissions – diffusion, ebullition, and plant-mediated transport. We perform idealized warming experiments, with increases in the mean annual temperature of 2.5, 5, and 7.5 ∘C on top of a historical simulation. The simulations reveal an approximately linear increase in emissions from ponds of 1.33 g CH4 yr−1 ∘C−1 m−2 in this temperature range. Under annual temperatures 5 ∘C above present temperatures, pond methane emissions are more than 3 times higher than now. Most of this emission increase is due to the additional substrate provided by the increased net productivity of the vascular plants. Furthermore, plant-mediated transport is the dominating pathway of methane emissions in all simulations. We conclude that vascular plants as a substrate source and efficient methane pathway should be included in future pan-Arctic assessments of pond methane emissions |
format |
Article in Journal/Newspaper |
author |
Rehder, Z. Kleinen, T. Kutzbach, L. Stepanenko, V. Langer, M. Brovkin, V. |
spellingShingle |
Rehder, Z. Kleinen, T. Kutzbach, L. Stepanenko, V. Langer, M. Brovkin, V. Simulated methane emissions from Arctic ponds are highly sensitive to warming |
author_facet |
Rehder, Z. Kleinen, T. Kutzbach, L. Stepanenko, V. Langer, M. Brovkin, V. |
author_sort |
Rehder, Z. |
title |
Simulated methane emissions from Arctic ponds are highly sensitive to warming |
title_short |
Simulated methane emissions from Arctic ponds are highly sensitive to warming |
title_full |
Simulated methane emissions from Arctic ponds are highly sensitive to warming |
title_fullStr |
Simulated methane emissions from Arctic ponds are highly sensitive to warming |
title_full_unstemmed |
Simulated methane emissions from Arctic ponds are highly sensitive to warming |
title_sort |
simulated methane emissions from arctic ponds are highly sensitive to warming |
publishDate |
2023 |
url |
http://hdl.handle.net/21.11116/0000-000D-3868-0 http://hdl.handle.net/21.11116/0000-000D-386C-C http://hdl.handle.net/21.11116/0000-000D-7388-8 http://hdl.handle.net/21.11116/0000-000D-7389-7 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Tundra Siberia |
genre_facet |
Arctic Tundra Siberia |
op_source |
Biogeosciences |
op_relation |
info:eu-repo/grantAgreement/EC/H2020/951288 info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-20-2837-2023 http://hdl.handle.net/21.11116/0000-000D-3868-0 http://hdl.handle.net/21.11116/0000-000D-386C-C http://hdl.handle.net/21.11116/0000-000D-7388-8 http://hdl.handle.net/21.11116/0000-000D-7389-7 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.5194/bg-20-2837-2023 |
container_title |
Frontiers in Marine Science |
container_volume |
5 |
_version_ |
1809762570214572032 |