Stabilization of mineral-associated organic carbon in Pleistocene permafrost
Ice-rich Pleistocene-age permafrost is particularly vulnerable to rapid thaw, which may quickly expose a large pool of sedimentary organic matter (OM) to microbial degradation and lead to emissions of climate-sensitive greenhouse gases. Protective physico-chemical mechanisms may, however, restrict m...
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2023
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ftawi:oai:epic.awi.de:57709 2023-06-11T04:12:33+02:00 Stabilization of mineral-associated organic carbon in Pleistocene permafrost Martens, Jannik Mueller, Carsten W Joshi, Prachi Rosinger, Christoph Maisch, Markus Kappler, Andreas Bonkowski, Michael Schwamborn, Georg Schirrmeister, Lutz Rethemeyer, Janet 2023-04-13 application/pdf https://epic.awi.de/id/eprint/57709/ https://epic.awi.de/id/eprint/57709/1/Martens_et_al_2023_nature_comm.pdf https://hdl.handle.net/10013/epic.27a82ef6-d35f-4aeb-b61a-ca5017bb701c unknown Springer Nature https://epic.awi.de/id/eprint/57709/1/Martens_et_al_2023_nature_comm.pdf Martens, J. , Mueller, C. W. , Joshi, P. , Rosinger, C. , Maisch, M. , Kappler, A. , Bonkowski, M. , Schwamborn, G. , Schirrmeister, L. and Rethemeyer, J. (2023) Stabilization of mineral-associated organic carbon in Pleistocene permafrost , Nature Communications, 14 . doi:10.1038/s41467-023-37766-5 <https://doi.org/10.1038/s41467-023-37766-5> , hdl:10013/epic.27a82ef6-d35f-4aeb-b61a-ca5017bb701c EPIC3Nature Communications, Springer Nature, 14, 8 p., ISSN: 2041-1723 Article isiRev 2023 ftawi https://doi.org/10.1038/s41467-023-37766-5 2023-04-23T23:18:38Z Ice-rich Pleistocene-age permafrost is particularly vulnerable to rapid thaw, which may quickly expose a large pool of sedimentary organic matter (OM) to microbial degradation and lead to emissions of climate-sensitive greenhouse gases. Protective physico-chemical mechanisms may, however, restrict microbial accessibility and reduce OM decomposition; mechanisms that may be influenced by changing environmental conditions during sediment deposition. Here we study different OM fractions in Siberian permafrost deposited during colder and warmer periods of the past 55,000 years. Among known stabilization mechanisms, the occlusion of OMin aggregates is of minor importance, while 33-74% of the organic carbon is associated with small, <6.3 μm mineral particles. Preservation of carbon in mineral-associated OM is enhanced by reactive iron minerals particularly during cold and dry climate, reflected by low microbial CO2 production in incubation experiments. Warmer and wetter conditions reduce OM stabilization, shown by more decomposed mineral-associated OM and up to 30% higher CO2 production. This shows that considering the stability and bioavailability of Pleistocene-age permafrost carbon is important for predicting future climate-carbon feedback. Article in Journal/Newspaper Ice permafrost Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Nature Communications 14 1 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Ice-rich Pleistocene-age permafrost is particularly vulnerable to rapid thaw, which may quickly expose a large pool of sedimentary organic matter (OM) to microbial degradation and lead to emissions of climate-sensitive greenhouse gases. Protective physico-chemical mechanisms may, however, restrict microbial accessibility and reduce OM decomposition; mechanisms that may be influenced by changing environmental conditions during sediment deposition. Here we study different OM fractions in Siberian permafrost deposited during colder and warmer periods of the past 55,000 years. Among known stabilization mechanisms, the occlusion of OMin aggregates is of minor importance, while 33-74% of the organic carbon is associated with small, <6.3 μm mineral particles. Preservation of carbon in mineral-associated OM is enhanced by reactive iron minerals particularly during cold and dry climate, reflected by low microbial CO2 production in incubation experiments. Warmer and wetter conditions reduce OM stabilization, shown by more decomposed mineral-associated OM and up to 30% higher CO2 production. This shows that considering the stability and bioavailability of Pleistocene-age permafrost carbon is important for predicting future climate-carbon feedback. |
format |
Article in Journal/Newspaper |
author |
Martens, Jannik Mueller, Carsten W Joshi, Prachi Rosinger, Christoph Maisch, Markus Kappler, Andreas Bonkowski, Michael Schwamborn, Georg Schirrmeister, Lutz Rethemeyer, Janet |
spellingShingle |
Martens, Jannik Mueller, Carsten W Joshi, Prachi Rosinger, Christoph Maisch, Markus Kappler, Andreas Bonkowski, Michael Schwamborn, Georg Schirrmeister, Lutz Rethemeyer, Janet Stabilization of mineral-associated organic carbon in Pleistocene permafrost |
author_facet |
Martens, Jannik Mueller, Carsten W Joshi, Prachi Rosinger, Christoph Maisch, Markus Kappler, Andreas Bonkowski, Michael Schwamborn, Georg Schirrmeister, Lutz Rethemeyer, Janet |
author_sort |
Martens, Jannik |
title |
Stabilization of mineral-associated organic carbon in Pleistocene permafrost |
title_short |
Stabilization of mineral-associated organic carbon in Pleistocene permafrost |
title_full |
Stabilization of mineral-associated organic carbon in Pleistocene permafrost |
title_fullStr |
Stabilization of mineral-associated organic carbon in Pleistocene permafrost |
title_full_unstemmed |
Stabilization of mineral-associated organic carbon in Pleistocene permafrost |
title_sort |
stabilization of mineral-associated organic carbon in pleistocene permafrost |
publisher |
Springer Nature |
publishDate |
2023 |
url |
https://epic.awi.de/id/eprint/57709/ https://epic.awi.de/id/eprint/57709/1/Martens_et_al_2023_nature_comm.pdf https://hdl.handle.net/10013/epic.27a82ef6-d35f-4aeb-b61a-ca5017bb701c |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
EPIC3Nature Communications, Springer Nature, 14, 8 p., ISSN: 2041-1723 |
op_relation |
https://epic.awi.de/id/eprint/57709/1/Martens_et_al_2023_nature_comm.pdf Martens, J. , Mueller, C. W. , Joshi, P. , Rosinger, C. , Maisch, M. , Kappler, A. , Bonkowski, M. , Schwamborn, G. , Schirrmeister, L. and Rethemeyer, J. (2023) Stabilization of mineral-associated organic carbon in Pleistocene permafrost , Nature Communications, 14 . doi:10.1038/s41467-023-37766-5 <https://doi.org/10.1038/s41467-023-37766-5> , hdl:10013/epic.27a82ef6-d35f-4aeb-b61a-ca5017bb701c |
op_doi |
https://doi.org/10.1038/s41467-023-37766-5 |
container_title |
Nature Communications |
container_volume |
14 |
container_issue |
1 |
_version_ |
1768388485826215936 |