Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia
Arctic warming is causing permafrost thaw and release of organic carbon (OC) to fluvial systems. Permafrost-derived OC can be transported downstream and degraded into greenhouse gases that may enhance climate warming. Susceptibility of OC to decomposition depends largely upon its source and composit...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/659602 2024-04-21T08:06:35+00:00 Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia Keskitalo, Kirsi H. Bröder, Lisa id_orcid:0 000-0002-5454-7883 Tesi, Tommaso Mann, Paul J. Jong, Dirk J. Bulte Garcia, Sergio Davydova, Anna Davydov, Sergei Zimov, Nikita Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. 2024 application/application/pdf https://hdl.handle.net/20.500.11850/659602 https://doi.org/10.3929/ethz-b-000659602 en eng Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-21-357-2024 info:eu-repo/semantics/altIdentifier/wos/001168771900001 http://hdl.handle.net/20.500.11850/659602 doi:10.3929/ethz-b-000659602 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International Biogeosciences, 21 (2) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2024 ftethz https://doi.org/20.500.11850/65960210.3929/ethz-b-00065960210.5194/bg-21-357-2024 2024-03-27T15:05:05Z Arctic warming is causing permafrost thaw and release of organic carbon (OC) to fluvial systems. Permafrost-derived OC can be transported downstream and degraded into greenhouse gases that may enhance climate warming. Susceptibility of OC to decomposition depends largely upon its source and composition, which vary throughout the seasonally distinct hydrograph. Most studies on carbon dynamics to date have focused on larger Arctic rivers, yet little is known about carbon cycling in lower-order rivers and streams. Here, we characterize the composition and sources of OC, focusing on less studied particulate OC (POC), in smaller waterways within the Kolyma River watershed. Additionally, we examine how watershed characteristics control carbon concentrations. In lower-order systems, we find rapid initiation of primary production in response to warm water temperatures during spring freshet, shown by decreasing δ¹³C-POC, in contrast to larger rivers. This results in CO₂ uptake by primary producers and microbial degradation of mainly autochthonous OC. However, if terrestrially derived inorganic carbon is assimilated by primary producers, part of it is returned via CO₂ emissions if the autochthonous OC pool is simultaneously degraded. As Arctic warming and hydrologic changes may increase OC transfer from smaller waterways to larger river networks, understanding carbon dynamics in smaller waterways is crucial. ISSN:1726-4170 ISSN:1726-4170 Article in Journal/Newspaper kolyma river permafrost Siberia ETH Zürich Research Collection |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
description |
Arctic warming is causing permafrost thaw and release of organic carbon (OC) to fluvial systems. Permafrost-derived OC can be transported downstream and degraded into greenhouse gases that may enhance climate warming. Susceptibility of OC to decomposition depends largely upon its source and composition, which vary throughout the seasonally distinct hydrograph. Most studies on carbon dynamics to date have focused on larger Arctic rivers, yet little is known about carbon cycling in lower-order rivers and streams. Here, we characterize the composition and sources of OC, focusing on less studied particulate OC (POC), in smaller waterways within the Kolyma River watershed. Additionally, we examine how watershed characteristics control carbon concentrations. In lower-order systems, we find rapid initiation of primary production in response to warm water temperatures during spring freshet, shown by decreasing δ¹³C-POC, in contrast to larger rivers. This results in CO₂ uptake by primary producers and microbial degradation of mainly autochthonous OC. However, if terrestrially derived inorganic carbon is assimilated by primary producers, part of it is returned via CO₂ emissions if the autochthonous OC pool is simultaneously degraded. As Arctic warming and hydrologic changes may increase OC transfer from smaller waterways to larger river networks, understanding carbon dynamics in smaller waterways is crucial. ISSN:1726-4170 ISSN:1726-4170 |
format |
Article in Journal/Newspaper |
author |
Keskitalo, Kirsi H. Bröder, Lisa id_orcid:0 000-0002-5454-7883 Tesi, Tommaso Mann, Paul J. Jong, Dirk J. Bulte Garcia, Sergio Davydova, Anna Davydov, Sergei Zimov, Nikita Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. |
spellingShingle |
Keskitalo, Kirsi H. Bröder, Lisa id_orcid:0 000-0002-5454-7883 Tesi, Tommaso Mann, Paul J. Jong, Dirk J. Bulte Garcia, Sergio Davydova, Anna Davydov, Sergei Zimov, Nikita Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia |
author_facet |
Keskitalo, Kirsi H. Bröder, Lisa id_orcid:0 000-0002-5454-7883 Tesi, Tommaso Mann, Paul J. Jong, Dirk J. Bulte Garcia, Sergio Davydova, Anna Davydov, Sergei Zimov, Nikita Haghipour, Negar Eglinton, Timothy I. Vonk, Jorien E. |
author_sort |
Keskitalo, Kirsi H. |
title |
Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia |
title_short |
Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia |
title_full |
Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia |
title_fullStr |
Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia |
title_full_unstemmed |
Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia |
title_sort |
seasonal particulate organic carbon dynamics of the kolyma river tributaries, siberia |
publisher |
Copernicus |
publishDate |
2024 |
url |
https://hdl.handle.net/20.500.11850/659602 https://doi.org/10.3929/ethz-b-000659602 |
genre |
kolyma river permafrost Siberia |
genre_facet |
kolyma river permafrost Siberia |
op_source |
Biogeosciences, 21 (2) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bg-21-357-2024 info:eu-repo/semantics/altIdentifier/wos/001168771900001 http://hdl.handle.net/20.500.11850/659602 doi:10.3929/ethz-b-000659602 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_doi |
https://doi.org/20.500.11850/65960210.3929/ethz-b-00065960210.5194/bg-21-357-2024 |
_version_ |
1796945988786585600 |