Extensive loss of past permafrost carbon but a net accumulation into present-day soils
Atmospheric concentrations of carbon dioxide increased between the Last Glacial Maximum (LGM, around 21,000 years ago) and the preindustrial era1. It is thought that the evolution of this atmospheric carbon dioxide (and that of atmospheric methane) during the glacial-to-interglacial transition was i...
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ftzenodo:oai:zenodo.org:3202535 2024-09-15T18:29:20+00:00 Extensive loss of past permafrost carbon but a net accumulation into present-day soils Lindgren, Amelie Hugelius, Gustaf Kuhry, Peter 2018-08-01 https://doi.org/10.1038/s41586-018-0371-0 unknown Zenodo https://zenodo.org/communities/nunataryuk https://zenodo.org/communities/eu https://doi.org/10.1038/s41586-018-0371-0 oai:zenodo.org:3202535 info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode info:eu-repo/semantics/article 2018 ftzenodo https://doi.org/10.1038/s41586-018-0371-0 2024-07-27T03:35:54Z Atmospheric concentrations of carbon dioxide increased between the Last Glacial Maximum (LGM, around 21,000 years ago) and the preindustrial era1. It is thought that the evolution of this atmospheric carbon dioxide (and that of atmospheric methane) during the glacial-to-interglacial transition was influenced by organic carbon that was stored in permafrost during the LGM and then underwent decomposition and release following thaw2,3. It has also been suggested that the rather erratic atmospheric δ13C and Δ14C signals seen during deglaciation1,4 could partly be explained by the presence of a large terrestrial inert LGM carbon stock, despite the biosphere being less productive (and therefore storing less carbon)5,6. Here we present an empirically derived estimate of the carbon stored in permafrost during the LGM by reconstructing the extent and carbon content of LGM biomes, peatland regions and deep sedimentary deposits. We find that the total estimated soil carbon stock for the LGM northern permafrost region is smaller than the estimated present-day storage (in both permafrost and non-permafrost soils) for the same region. A substantial decrease in the permafrost area from the LGM to the present day has been accompanied by a roughly 400-petagram increase in the total soil carbon stock. This increase in soil carbon suggests that permafrost carbon has made no net contribution to the atmospheric carbon pool since the LGM. However, our results also indicate potential postglacial reductions in the portion of the carbon stock that is trapped in permafrost, of around 1,000 petagrams, supporting earlier studies7. We further find that carbon has shifted from being primarily stored in permafrost mineral soils and loess deposits during the LGM, to being roughly equally divided between peatlands, mineral soils and permafrost loess deposits today. Article in Journal/Newspaper permafrost Zenodo Nature 560 7717 219 222 |
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Atmospheric concentrations of carbon dioxide increased between the Last Glacial Maximum (LGM, around 21,000 years ago) and the preindustrial era1. It is thought that the evolution of this atmospheric carbon dioxide (and that of atmospheric methane) during the glacial-to-interglacial transition was influenced by organic carbon that was stored in permafrost during the LGM and then underwent decomposition and release following thaw2,3. It has also been suggested that the rather erratic atmospheric δ13C and Δ14C signals seen during deglaciation1,4 could partly be explained by the presence of a large terrestrial inert LGM carbon stock, despite the biosphere being less productive (and therefore storing less carbon)5,6. Here we present an empirically derived estimate of the carbon stored in permafrost during the LGM by reconstructing the extent and carbon content of LGM biomes, peatland regions and deep sedimentary deposits. We find that the total estimated soil carbon stock for the LGM northern permafrost region is smaller than the estimated present-day storage (in both permafrost and non-permafrost soils) for the same region. A substantial decrease in the permafrost area from the LGM to the present day has been accompanied by a roughly 400-petagram increase in the total soil carbon stock. This increase in soil carbon suggests that permafrost carbon has made no net contribution to the atmospheric carbon pool since the LGM. However, our results also indicate potential postglacial reductions in the portion of the carbon stock that is trapped in permafrost, of around 1,000 petagrams, supporting earlier studies7. We further find that carbon has shifted from being primarily stored in permafrost mineral soils and loess deposits during the LGM, to being roughly equally divided between peatlands, mineral soils and permafrost loess deposits today. |
format |
Article in Journal/Newspaper |
author |
Lindgren, Amelie Hugelius, Gustaf Kuhry, Peter |
spellingShingle |
Lindgren, Amelie Hugelius, Gustaf Kuhry, Peter Extensive loss of past permafrost carbon but a net accumulation into present-day soils |
author_facet |
Lindgren, Amelie Hugelius, Gustaf Kuhry, Peter |
author_sort |
Lindgren, Amelie |
title |
Extensive loss of past permafrost carbon but a net accumulation into present-day soils |
title_short |
Extensive loss of past permafrost carbon but a net accumulation into present-day soils |
title_full |
Extensive loss of past permafrost carbon but a net accumulation into present-day soils |
title_fullStr |
Extensive loss of past permafrost carbon but a net accumulation into present-day soils |
title_full_unstemmed |
Extensive loss of past permafrost carbon but a net accumulation into present-day soils |
title_sort |
extensive loss of past permafrost carbon but a net accumulation into present-day soils |
publisher |
Zenodo |
publishDate |
2018 |
url |
https://doi.org/10.1038/s41586-018-0371-0 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
https://zenodo.org/communities/nunataryuk https://zenodo.org/communities/eu https://doi.org/10.1038/s41586-018-0371-0 oai:zenodo.org:3202535 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.1038/s41586-018-0371-0 |
container_title |
Nature |
container_volume |
560 |
container_issue |
7717 |
container_start_page |
219 |
op_container_end_page |
222 |
_version_ |
1810470738643124224 |