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- Matsubara, Felipe,1991-Stockholms universitet,Institutionen för miljövetenskap,Bolincentret för klimatforskning (tills m KTH & SMHI) (author)
Molecular-Multiproxy Assessment of Land-Derived Organic Matter Degradation Over Extensive Scales of the East Siberian Arctic Shelf Seas
- Article/chapterEnglish2022
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- 2022
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- LIBRIS-ID:oai:DiVA.org:su-215160
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-215160URI
- https://doi.org/10.1029/2022GB007428DOI
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- Language:English
- Summary in:English
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- 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.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences hsv//eng
- Arctic Ocean
- carbon cycling
- permafrost
- biomarker
- organic matter degradation
- continental shelf
Added entries (persons, corporate bodies, meetings, titles ...)
- Wild, BirgitStockholms universitet,Institutionen för miljövetenskap,Bolincentret för klimatforskning (tills m KTH & SMHI)(Swepub:su)bwild (author)
- Martens, Jannik,1991-Stockholms universitet,Institutionen för miljövetenskap,Bolincentret för klimatforskning (tills m KTH & SMHI)(Swepub:su)jama3823 (author)
- Andersson, AugustStockholms universitet,Institutionen för miljövetenskap,Bolincentret för klimatforskning (tills m KTH & SMHI)(Swepub:su)auand (author)
- Wennström, R.Stockholms universitet,Institutionen för miljövetenskap (author)
- Bröder, L. (author)
- Dudarev, O. V. (author)
- Semiletov, I. (author)
- Gustafsson, ÖrjanStockholms universitet,Institutionen för miljövetenskap,Bolincentret för klimatforskning (tills m KTH & SMHI)(Swepub:su)ogust (author)
- Stockholms universitetInstitutionen för miljövetenskap (creator_code:org_t)
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- In:Global Biogeochemical Cycles36:120886-62361944-9224
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