The Role of Coastal Yedoma Deposits and Continental Shelf Sediments in the Arctic Ocean Silicon Cycle
| Author(s) | Ray, Nicholas E. | |
| Author(s) | Martens, Jannik | |
| Author(s) | Ajmar, Marco | |
| Author(s) | Tesi, Tommaso | |
| Author(s) | Yakushev, Evgeniy | |
| Author(s) | Gangnus, Ivan | |
| Author(s) | Strauss, Jens | |
| Author(s) | Schirrmeister, Lutz | |
| Author(s) | Semiletov, Igor | |
| Author(s) | Wild, Birgit | |
| Date Accessioned | 2024-03-15T19:40:42Z | |
| Date Available | 2024-03-15T19:40:42Z | |
| Publication Date | 2024-01-09 | |
| Description | This article was originally published in Global Biogeochemical Cycles by American Geophysical Union. The version of record is available at: https://doi.org/10.1029/2023GB007746. © 2024. The Authors. | |
| Abstract | The availability of silicon (Si) in the ocean plays an important role in regulating biogeochemical and ecological processes. The Si budget of the Arctic Ocean appears balanced, with inputs equivalent to outputs, though it is unclear how a changing climate might aggravate this balance. In this study, we focus on Si cycling in Arctic coastal areas and continental shelf sediments to better constrain the Arctic Ocean Si budget. We provide the first estimate of amorphous Si (ASi) loading from erosion of coastal Yedoma deposits (30–90 Gmol yr−1), demonstrating comparable rates to particulate Si loading from rivers (10–90 Gmol yr−1). We found a positive relationship between surface sediment ASi and organic matter content on continental shelves. Combining these values with published Arctic shelf sediment properties and burial rates we estimate 70 Gmol Si yr−1 is buried on Arctic continental shelves, equivalent to 4.5% of all Si inputs to the Arctic Ocean. Sediment dissolved Si fluxes increased with distance from river mouths along cruise transects of shelf regions influenced by major rivers in the Laptev and East Siberian seas. On an annual basis, we estimate that Arctic shelf sediments recycle approximately up to twice as much DSi (680 Gmol Si) as is loaded from rivers (340–500 Gmol Si). Key Points - Coastal erosion loads 30–90 Gmol Si yr−1 to the Arctic Ocean in the form of amorphous silicon - Continental shelf sediments in the Arctic Ocean recycle more silicon than is loaded from rivers - Approximately 4.5% of silicon loaded on the Arctic Ocean is buried in continental shelf sediments | |
| Sponsor | We thank the crew and scientific team of the ISSS-2020 expedition. This work was funded by the Swedish Research Council VR (Grants 2018-05489 to B.W., 2021–06670 to J. M., as well as 2017-01601), the Swedish Research Council for Sustainable Development Formas (Grant 2018-01547 to B.W.), and Research Council of Norway (Grant 315317 for E.Y). JS and LS as well as the terrestrial Yedoma sampling were part of the joint National Environmental Research Council (UK) - Federal Ministry of Education and Research (BMBF; Germany) project #03F0806A, European Research Council starting grant #338335, German Research Foundation project POLYGON (He3622/16-1), and BMBF projects #3F0764B, # 03 G0836, and # 03G0569. We thank Daniel Conley for providing the external Si reference material. The field work was supported by the Russian Science Foundation (Grant: 21-77-30001 awarded to I.S.). Additional support was from the Ministry of Science and Higher Education of the Russian Federation (Grant “Priority-2030”, Tomsk State University). The charter of the R/V Akademik Mstislav Keldysh was funded by Grant 121021500057-4 from the Ministry of Science and Higher Education of the Russian Federation. | |
| Citation | Ray, N. E., Martens, J., Ajmar, M., Tesi, T., Yakushev, E., Gangnus, I., et al. (2024). The role of coastal Yedoma deposits and continental shelf sediments in the Arctic Ocean silicon cycle. Global Biogeochemical Cycles, 38, e2023GB007746. https://doi.org/10.1029/2023GB007746 | |
| ISSN | 1944-9224 | |
| URL | https://udspace.udel.edu/handle/19716/34200 | |
| Language | en_US | |
| Publisher | Global Biogeochemical Cycles | |
| dc.rights | Attribution 4.0 International | en |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | |
| Keywords | silicon | |
| Keywords | Arctic Ocean | |
| Keywords | continental shelf | |
| Keywords | Yedoma | |
| Keywords | coastal erosion | |
| Title | The Role of Coastal Yedoma Deposits and Continental Shelf Sediments in the Arctic Ocean Silicon Cycle | |
| Type | Article |
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