Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium.
Arctic soils are the largest pool of soil organic carbon worldwide. Temperatures in the Arctic have risen faster than the global average during the last decades, decreasing annual freezing days and increasing the number of freeze-thaw cycles (temperature oscillations passing through zero degrees) pe...
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ftunivbern:oai:boris.unibe.ch:178334 2023-08-20T04:02:56+02:00 Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. Schaller, Jörg Stimmler, Peter Göckede, Mathias Augustin, Jürgen Lacroix, Fabrice Hoffmann, Mathias 2023-04-20 application/pdf https://boris.unibe.ch/178334/1/1-s2.0-S0048969723005582-main.pdf https://boris.unibe.ch/178334/ eng eng Elsevier https://boris.unibe.ch/178334/ info:eu-repo/semantics/restrictedAccess Schaller, Jörg; Stimmler, Peter; Göckede, Mathias; Augustin, Jürgen; Lacroix, Fabrice; Hoffmann, Mathias (2023). Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. The Science of the total environment, 870(161943), p. 161943. Elsevier 10.1016/j.scitotenv.2023.161943 <http://dx.doi.org/10.1016/j.scitotenv.2023.161943> info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2023 ftunivbern https://doi.org/10.1016/j.scitotenv.2023.161943 2023-07-31T22:19:12Z Arctic soils are the largest pool of soil organic carbon worldwide. Temperatures in the Arctic have risen faster than the global average during the last decades, decreasing annual freezing days and increasing the number of freeze-thaw cycles (temperature oscillations passing through zero degrees) per year as the temperature is expected to fluctuate more around 0 °C. At the same time, proceeding deepening of seasonal thaw may increase silicon (Si) and calcium (Ca) concentrations in the active layer of Arctic soils as the concentrations in the thawing permafrost layer might be higher depending on location. We analyzed the importance of freeze-thaw cycles for Arctic soil CO2 fluxes. Furthermore, we tested how Si (mobilizing organic C) and Ca (immobilizing organic C) interfere with the soil CO2 fluxes in the context of freeze-thaw cycles. Our results show that with each freeze-thaw cycle the CO2 fluxes from the Arctic soils decreased. Our data revealed a considerable CO2 emission below 0 °C. We also show that pronounced differences emerge in Arctic soil CO2 fluxes with Si increasing and Ca decreasing CO2 fluxes. Furthermore, we show that both Si and Ca concentrations in Arctic soils are central controls on Arctic soil CO2 release, with Si increasing Arctic soil CO2 release especially when temperatures are just below 0 °C. Our findings could provide an important constraint on soil CO2 emissions upon soil thaw, as well as on the greenhouse gas budget of high latitudes. Thus we call for work improving understanding of freeze-thaw cycles as well as the effect of Ca and Si on carbon fluxes, as well as for increased consideration of those factors in wide-scale assessments of carbon fluxes in the high latitudes. Article in Journal/Newspaper Arctic Arctic permafrost BORIS (Bern Open Repository and Information System, University of Bern) Arctic Science of The Total Environment 870 161943 |
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Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
description |
Arctic soils are the largest pool of soil organic carbon worldwide. Temperatures in the Arctic have risen faster than the global average during the last decades, decreasing annual freezing days and increasing the number of freeze-thaw cycles (temperature oscillations passing through zero degrees) per year as the temperature is expected to fluctuate more around 0 °C. At the same time, proceeding deepening of seasonal thaw may increase silicon (Si) and calcium (Ca) concentrations in the active layer of Arctic soils as the concentrations in the thawing permafrost layer might be higher depending on location. We analyzed the importance of freeze-thaw cycles for Arctic soil CO2 fluxes. Furthermore, we tested how Si (mobilizing organic C) and Ca (immobilizing organic C) interfere with the soil CO2 fluxes in the context of freeze-thaw cycles. Our results show that with each freeze-thaw cycle the CO2 fluxes from the Arctic soils decreased. Our data revealed a considerable CO2 emission below 0 °C. We also show that pronounced differences emerge in Arctic soil CO2 fluxes with Si increasing and Ca decreasing CO2 fluxes. Furthermore, we show that both Si and Ca concentrations in Arctic soils are central controls on Arctic soil CO2 release, with Si increasing Arctic soil CO2 release especially when temperatures are just below 0 °C. Our findings could provide an important constraint on soil CO2 emissions upon soil thaw, as well as on the greenhouse gas budget of high latitudes. Thus we call for work improving understanding of freeze-thaw cycles as well as the effect of Ca and Si on carbon fluxes, as well as for increased consideration of those factors in wide-scale assessments of carbon fluxes in the high latitudes. |
format |
Article in Journal/Newspaper |
author |
Schaller, Jörg Stimmler, Peter Göckede, Mathias Augustin, Jürgen Lacroix, Fabrice Hoffmann, Mathias |
spellingShingle |
Schaller, Jörg Stimmler, Peter Göckede, Mathias Augustin, Jürgen Lacroix, Fabrice Hoffmann, Mathias Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. |
author_facet |
Schaller, Jörg Stimmler, Peter Göckede, Mathias Augustin, Jürgen Lacroix, Fabrice Hoffmann, Mathias |
author_sort |
Schaller, Jörg |
title |
Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. |
title_short |
Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. |
title_full |
Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. |
title_fullStr |
Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. |
title_full_unstemmed |
Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. |
title_sort |
arctic soil co2 release during freeze-thaw cycles modulated by silicon and calcium. |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://boris.unibe.ch/178334/1/1-s2.0-S0048969723005582-main.pdf https://boris.unibe.ch/178334/ |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic permafrost |
genre_facet |
Arctic Arctic permafrost |
op_source |
Schaller, Jörg; Stimmler, Peter; Göckede, Mathias; Augustin, Jürgen; Lacroix, Fabrice; Hoffmann, Mathias (2023). Arctic soil CO2 release during freeze-thaw cycles modulated by silicon and calcium. The Science of the total environment, 870(161943), p. 161943. Elsevier 10.1016/j.scitotenv.2023.161943 <http://dx.doi.org/10.1016/j.scitotenv.2023.161943> |
op_relation |
https://boris.unibe.ch/178334/ |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.scitotenv.2023.161943 |
container_title |
Science of The Total Environment |
container_volume |
870 |
container_start_page |
161943 |
_version_ |
1774713455529426944 |