Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia
<p>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...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2024-01-01
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| Series: | Biogeosciences |
| Online Access: | https://bg.copernicus.org/articles/21/357/2024/bg-21-357-2024.pdf |
| _version_ | 1827376565882716160 |
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| author | K. H. Keskitalo K. H. Keskitalo L. Bröder L. Bröder T. Tesi P. J. Mann D. J. Jong S. Bulte Garcia A. Davydova S. Davydov N. Zimov N. Haghipour N. Haghipour T. I. Eglinton J. E. Vonk |
| author_facet | K. H. Keskitalo K. H. Keskitalo L. Bröder L. Bröder T. Tesi P. J. Mann D. J. Jong S. Bulte Garcia A. Davydova S. Davydov N. Zimov N. Haghipour N. Haghipour T. I. Eglinton J. E. Vonk |
| author_sort | K. H. Keskitalo |
| collection | DOAJ |
| description | <p>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 <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC, in contrast to larger rivers. This results in CO<span class="inline-formula"><sub>2</sub></span> 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 CO<span class="inline-formula"><sub>2</sub></span> 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.</p> |
| first_indexed | 2024-03-08T12:24:30Z |
| format | Article |
| id | doaj.art-bd9451357a914c6b8c09201bfaea6edf |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-03-08T12:24:30Z |
| publishDate | 2024-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-bd9451357a914c6b8c09201bfaea6edf2024-01-22T13:16:15ZengCopernicus PublicationsBiogeosciences1726-41701726-41892024-01-012135737910.5194/bg-21-357-2024Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, SiberiaK. H. Keskitalo0K. H. Keskitalo1L. Bröder2L. Bröder3T. Tesi4P. J. Mann5D. J. Jong6S. Bulte Garcia7A. Davydova8S. Davydov9N. Zimov10N. Haghipour11N. Haghipour12T. I. Eglinton13J. E. Vonk14Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, the NetherlandsDepartment of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, UKDepartment of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, the NetherlandsDepartment of Earth Sciences, Swiss Federal Institute of Technology, Zurich, SwitzerlandNational Research Council, Institute of Polar Sciences in Bologna, Bologna, ItalyDepartment of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, UKDepartment of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, the NetherlandsDepartment of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, the NetherlandsPacific Geographical Institute, Far East Branch, Russian Academy of Sciences, Northeast Science Station, Cherskiy, Republic of Sakha, Yakutia, RussiaPacific Geographical Institute, Far East Branch, Russian Academy of Sciences, Northeast Science Station, Cherskiy, Republic of Sakha, Yakutia, RussiaPacific Geographical Institute, Far East Branch, Russian Academy of Sciences, Northeast Science Station, Cherskiy, Republic of Sakha, Yakutia, RussiaDepartment of Earth Sciences, Swiss Federal Institute of Technology, Zurich, SwitzerlandLaboratory of Ion Beam Physics, Swiss Federal Institute of Technology, Zurich, SwitzerlandDepartment of Earth Sciences, Swiss Federal Institute of Technology, Zurich, SwitzerlandDepartment of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands<p>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 <span class="inline-formula"><i>δ</i><sup>13</sup></span>C-POC, in contrast to larger rivers. This results in CO<span class="inline-formula"><sub>2</sub></span> 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 CO<span class="inline-formula"><sub>2</sub></span> 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.</p>https://bg.copernicus.org/articles/21/357/2024/bg-21-357-2024.pdf |
| spellingShingle | K. H. Keskitalo K. H. Keskitalo L. Bröder L. Bröder T. Tesi P. J. Mann D. J. Jong S. Bulte Garcia A. Davydova S. Davydov N. Zimov N. Haghipour N. Haghipour T. I. Eglinton J. E. Vonk Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia Biogeosciences |
| title | 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_short | Seasonal particulate organic carbon dynamics of the Kolyma River tributaries, Siberia |
| title_sort | seasonal particulate organic carbon dynamics of the kolyma river tributaries siberia |
| url | https://bg.copernicus.org/articles/21/357/2024/bg-21-357-2024.pdf |
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