Molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the East Siberian Arctic Shelf seas
Global warming triggers permafrost thaw, which increases the release of terrigenous organic matter (terr-OM) to the Arctic Ocean by coastal erosion and rivers. Terrigenous OM degradation in the Arctic Ocean contributes to greenhouse gas emissions and severe ocean acidification, yet the vulnerability...
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fttomskstateuniv:koha:001010831 2023-12-31T10:03:17+01:00 Molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the East Siberian Arctic Shelf seas Matsubara, Felipe Wild, Birgit Martens, Jannik Andersson, A. Wennström, R. Bröder, L. Dudarev, Oleg V. Semiletov, Igor P. Gustafsson, Örjan 2022 application/pdf https://doi.org/10.1029/2022GB007428 https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001010831 eng eng koha:001010831 doi:10.1029/2022GB007428 https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001010831 Global biogeochemical cycles. 2022. Vol. 36, № 12. P. e2022GB007428 (1-19) деградация органические вещества арктический шельф Восточная Сибирь терригенные отложения статьи в журналах info:eu-repo/semantics/article 2022 fttomskstateuniv https://doi.org/10.1029/2022GB007428 2023-12-05T17:42:25Z Global warming triggers permafrost thaw, which increases the release of terrigenous organic matter (terr-OM) to the Arctic Ocean by coastal erosion and rivers. Terrigenous OM degradation in the Arctic Ocean contributes to greenhouse gas emissions and severe ocean acidification, yet the vulnerability of different terr-OM components is poorly resolved. Here, terr-OM degradation dynamics are studied with unprecedented spatial coverage over the World's largest shelf sea system—the East Siberian Arctic Shelf (ESAS), using a multi-proxy molecular biomarker approach. Mineral-surface-area-normalized concentrations of terr-OM compounds in surface sediments decreases offshore. Differences between terr-OM compound classes (lignin phenols, high-molecular weight [HMW] n-alkanes, n-alkanoic acids and n-alkanols, sterols, 3,5-dihydroxybenzoic acids, cutin acids) reflect contrasting influence of sources, propensity to microbial degradation and association with sedimenting particles, with lignin phenols disappearing 3-times faster than total terr-OM, and twice faster than other biomarkers. Molecular degradation proxies support substantial terr-OM degradation across the ESAS, with clearest trends shown by: 3,5-dihydroxybenzoic acid/vanillyl phenol ratios, acid-to-aldehyde ratios of syringyl and vanillyl phenols, Carbon Preference Indices of HMW n-alkyl compounds and sitostanol/β-sitosterol. The combination of terr-OM biomarker data with δ13C/Δ14C-based source apportionment indicates that the more degraded state of lignin is influenced by the relative contribution of river-transported terr-OM from surface soils, while HMW n-alkanoic acids and stigmasterol are influenced by erosion-derived terr-OM from Ice Complex deposits. Our findings demonstrate differences in vulnerability to degradation between contrasting terr-OM pools, and underscore the need to consider molecular properties for understanding and modeling of large-scale biogeochemical processes of the permafrost carbon-climate feedback. Article in Journal/Newspaper Arctic Arctic Ocean Global warming Ice Ocean acidification permafrost Tomsk State University Research Library Global Biogeochemical Cycles 36 12 |
institution |
Open Polar |
collection |
Tomsk State University Research Library |
op_collection_id |
fttomskstateuniv |
language |
English |
topic |
деградация органические вещества арктический шельф Восточная Сибирь терригенные отложения |
spellingShingle |
деградация органические вещества арктический шельф Восточная Сибирь терригенные отложения Matsubara, Felipe Wild, Birgit Martens, Jannik Andersson, A. Wennström, R. Bröder, L. Dudarev, Oleg V. Semiletov, Igor P. Gustafsson, Örjan Molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the East Siberian Arctic Shelf seas |
topic_facet |
деградация органические вещества арктический шельф Восточная Сибирь терригенные отложения |
description |
Global warming triggers permafrost thaw, which increases the release of terrigenous organic matter (terr-OM) to the Arctic Ocean by coastal erosion and rivers. Terrigenous OM degradation in the Arctic Ocean contributes to greenhouse gas emissions and severe ocean acidification, yet the vulnerability of different terr-OM components is poorly resolved. Here, terr-OM degradation dynamics are studied with unprecedented spatial coverage over the World's largest shelf sea system—the East Siberian Arctic Shelf (ESAS), using a multi-proxy molecular biomarker approach. Mineral-surface-area-normalized concentrations of terr-OM compounds in surface sediments decreases offshore. Differences between terr-OM compound classes (lignin phenols, high-molecular weight [HMW] n-alkanes, n-alkanoic acids and n-alkanols, sterols, 3,5-dihydroxybenzoic acids, cutin acids) reflect contrasting influence of sources, propensity to microbial degradation and association with sedimenting particles, with lignin phenols disappearing 3-times faster than total terr-OM, and twice faster than other biomarkers. Molecular degradation proxies support substantial terr-OM degradation across the ESAS, with clearest trends shown by: 3,5-dihydroxybenzoic acid/vanillyl phenol ratios, acid-to-aldehyde ratios of syringyl and vanillyl phenols, Carbon Preference Indices of HMW n-alkyl compounds and sitostanol/β-sitosterol. The combination of terr-OM biomarker data with δ13C/Δ14C-based source apportionment indicates that the more degraded state of lignin is influenced by the relative contribution of river-transported terr-OM from surface soils, while HMW n-alkanoic acids and stigmasterol are influenced by erosion-derived terr-OM from Ice Complex deposits. Our findings demonstrate differences in vulnerability to degradation between contrasting terr-OM pools, and underscore the need to consider molecular properties for understanding and modeling of large-scale biogeochemical processes of the permafrost carbon-climate feedback. |
format |
Article in Journal/Newspaper |
author |
Matsubara, Felipe Wild, Birgit Martens, Jannik Andersson, A. Wennström, R. Bröder, L. Dudarev, Oleg V. Semiletov, Igor P. Gustafsson, Örjan |
author_facet |
Matsubara, Felipe Wild, Birgit Martens, Jannik Andersson, A. Wennström, R. Bröder, L. Dudarev, Oleg V. Semiletov, Igor P. Gustafsson, Örjan |
author_sort |
Matsubara, Felipe |
title |
Molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the East Siberian Arctic Shelf seas |
title_short |
Molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the East Siberian Arctic Shelf seas |
title_full |
Molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the East Siberian Arctic Shelf seas |
title_fullStr |
Molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the East Siberian Arctic Shelf seas |
title_full_unstemmed |
Molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the East Siberian Arctic Shelf seas |
title_sort |
molecular-multiproxy assessment of land-derived organic matter degradation over extensive scales of the east siberian arctic shelf seas |
publishDate |
2022 |
url |
https://doi.org/10.1029/2022GB007428 https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001010831 |
genre |
Arctic Arctic Ocean Global warming Ice Ocean acidification permafrost |
genre_facet |
Arctic Arctic Ocean Global warming Ice Ocean acidification permafrost |
op_source |
Global biogeochemical cycles. 2022. Vol. 36, № 12. P. e2022GB007428 (1-19) |
op_relation |
koha:001010831 doi:10.1029/2022GB007428 https://vital.lib.tsu.ru/vital/access/manager/Repository/koha:001010831 |
op_doi |
https://doi.org/10.1029/2022GB007428 |
container_title |
Global Biogeochemical Cycles |
container_volume |
36 |
container_issue |
12 |
_version_ |
1786820057931710464 |