Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf
Arctic rivers will be increasingly affected by the hydrological and biogeochemical consequences of thawing permafrost. During transport, permafrost-derived organic carbon (OC) can either accumulate in floodplain and shelf sediments or be degraded into greenhouse gases prior to final burial. Thus, th...
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ftdoajarticles:oai:doaj.org/article:df7eeb7242fe41eeaaa4279a670e4156 2023-05-15T15:16:24+02:00 Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf D. Jong L. Bröder T. Tesi K. H. Keskitalo N. Zimov A. Davydova P. Pika N. Haghipour T. I. Eglinton J. E. Vonk 2023-01-01T00:00:00Z https://doi.org/10.5194/bg-20-271-2023 https://doaj.org/article/df7eeb7242fe41eeaaa4279a670e4156 EN eng Copernicus Publications https://bg.copernicus.org/articles/20/271/2023/bg-20-271-2023.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-20-271-2023 1726-4170 1726-4189 https://doaj.org/article/df7eeb7242fe41eeaaa4279a670e4156 Biogeosciences, Vol 20, Pp 271-294 (2023) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2023 ftdoajarticles https://doi.org/10.5194/bg-20-271-2023 2023-01-22T01:39:03Z Arctic rivers will be increasingly affected by the hydrological and biogeochemical consequences of thawing permafrost. During transport, permafrost-derived organic carbon (OC) can either accumulate in floodplain and shelf sediments or be degraded into greenhouse gases prior to final burial. Thus, the net impact of permafrost OC on climate will ultimately depend on the interplay of complex processes that occur along the source-to-sink system. Here, we focus on the Kolyma River, the largest watershed completely underlain by continuous permafrost, and marine sediments of the East Siberian Sea, as a transect to investigate the fate of permafrost OC along the land–ocean continuum. Three pools of riverine OC were investigated for the Kolyma main stem and five of its tributaries: dissolved OC (DOC), suspended particulate OC (POC), and riverbed sediment OC (SOC). They were compared with earlier findings in marine sediments. Carbon isotopes ( δ 13 C , Δ 14 C ), lignin phenol, and lipid biomarker proxies show a contrasting composition and degradation state of these different carbon pools. Dual C isotope source apportionment calculations imply that old permafrost-OC is mostly associated with sediments (SOC; contribution of 68±10 %), and less dominant in POC ( 38±8 %), whereas autochthonous primary production contributes around 44±10 % to POC in the main stem and up to 79±11 % in tributaries. Biomarker degradation indices suggest that Kolyma DOC might be relatively degraded, regardless of its generally young age shown by previous studies. In contrast, SOC shows the lowest Δ 14 C value (oldest OC), yet relatively fresh compositional signatures. Furthermore, decreasing mineral surface area-normalised OC- and biomarker loadings suggest that SOC might be reactive along the land–ocean continuum and almost all parameters were subjected to rapid change when moving from freshwater to the marine environment. This suggests that sedimentary dynamics play a crucial role when targeting permafrost-derived OC in aquatic systems and ... Article in Journal/Newspaper Arctic East Siberian Sea kolyma river permafrost Directory of Open Access Journals: DOAJ Articles Arctic East Siberian Sea ENVELOPE(166.000,166.000,74.000,74.000) East Siberian Shelf ENVELOPE(-162.267,-162.267,74.400,74.400) Kolyma ENVELOPE(161.000,161.000,69.500,69.500) Biogeosciences 20 1 271 294 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
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Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 D. Jong L. Bröder T. Tesi K. H. Keskitalo N. Zimov A. Davydova P. Pika N. Haghipour T. I. Eglinton J. E. Vonk Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Arctic rivers will be increasingly affected by the hydrological and biogeochemical consequences of thawing permafrost. During transport, permafrost-derived organic carbon (OC) can either accumulate in floodplain and shelf sediments or be degraded into greenhouse gases prior to final burial. Thus, the net impact of permafrost OC on climate will ultimately depend on the interplay of complex processes that occur along the source-to-sink system. Here, we focus on the Kolyma River, the largest watershed completely underlain by continuous permafrost, and marine sediments of the East Siberian Sea, as a transect to investigate the fate of permafrost OC along the land–ocean continuum. Three pools of riverine OC were investigated for the Kolyma main stem and five of its tributaries: dissolved OC (DOC), suspended particulate OC (POC), and riverbed sediment OC (SOC). They were compared with earlier findings in marine sediments. Carbon isotopes ( δ 13 C , Δ 14 C ), lignin phenol, and lipid biomarker proxies show a contrasting composition and degradation state of these different carbon pools. Dual C isotope source apportionment calculations imply that old permafrost-OC is mostly associated with sediments (SOC; contribution of 68±10 %), and less dominant in POC ( 38±8 %), whereas autochthonous primary production contributes around 44±10 % to POC in the main stem and up to 79±11 % in tributaries. Biomarker degradation indices suggest that Kolyma DOC might be relatively degraded, regardless of its generally young age shown by previous studies. In contrast, SOC shows the lowest Δ 14 C value (oldest OC), yet relatively fresh compositional signatures. Furthermore, decreasing mineral surface area-normalised OC- and biomarker loadings suggest that SOC might be reactive along the land–ocean continuum and almost all parameters were subjected to rapid change when moving from freshwater to the marine environment. This suggests that sedimentary dynamics play a crucial role when targeting permafrost-derived OC in aquatic systems and ... |
format |
Article in Journal/Newspaper |
author |
D. Jong L. Bröder T. Tesi K. H. Keskitalo N. Zimov A. Davydova P. Pika N. Haghipour T. I. Eglinton J. E. Vonk |
author_facet |
D. Jong L. Bröder T. Tesi K. H. Keskitalo N. Zimov A. Davydova P. Pika N. Haghipour T. I. Eglinton J. E. Vonk |
author_sort |
D. Jong |
title |
Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf |
title_short |
Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf |
title_full |
Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf |
title_fullStr |
Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf |
title_full_unstemmed |
Contrasts in dissolved, particulate, and sedimentary organic carbon from the Kolyma River to the East Siberian Shelf |
title_sort |
contrasts in dissolved, particulate, and sedimentary organic carbon from the kolyma river to the east siberian shelf |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/bg-20-271-2023 https://doaj.org/article/df7eeb7242fe41eeaaa4279a670e4156 |
long_lat |
ENVELOPE(166.000,166.000,74.000,74.000) ENVELOPE(-162.267,-162.267,74.400,74.400) ENVELOPE(161.000,161.000,69.500,69.500) |
geographic |
Arctic East Siberian Sea East Siberian Shelf Kolyma |
geographic_facet |
Arctic East Siberian Sea East Siberian Shelf Kolyma |
genre |
Arctic East Siberian Sea kolyma river permafrost |
genre_facet |
Arctic East Siberian Sea kolyma river permafrost |
op_source |
Biogeosciences, Vol 20, Pp 271-294 (2023) |
op_relation |
https://bg.copernicus.org/articles/20/271/2023/bg-20-271-2023.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-20-271-2023 1726-4170 1726-4189 https://doaj.org/article/df7eeb7242fe41eeaaa4279a670e4156 |
op_doi |
https://doi.org/10.5194/bg-20-271-2023 |
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Biogeosciences |
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20 |
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271 |
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