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| Pàgina inicial > Articles > Articles publicats > Assessment of Short-Term Sediment Deposition Patterns Along the Palamós Submarine Canyon (NW Mediterranean) Using 234Th |
| Data: | 2025 |
| Resum: | Sedimentary dynamics in the Palamós Canyon are influenced by river inputs and storm resuspension, as well as by bottom trawling on the canyon flanks. In this study, we estimate recent sediment deposition patterns along the canyon axis using the excess activity concentration of the short-lived radiotracer 234Th (half-life of 24. 1 days). Sediment cores were obtained at various locations along the canyon axis from a depth of approximately 800 m to 2100 m in June 2023 and August 2024. Excess 234Th (234Thxs) was detected in all sampled sites with variable penetration depths (0. 5-3. 5 cm). 234Thxs-derived estimations of mixing rates decreased downcanyon from up to 15. 6 cm2 y-1 at the canyon head (~800 m) to negligible mixing at the canyon mouth (~2100 m). 234Thxs inventories, a proxy of recent sediment deposition, were high (1800-3490 Bq m-2) at the canyon head and at the upper canyon (~1400 m) close to fishing grounds and decreased downcanyon (82-694 Bq m-2) at the lower canyon (~1800 m) and canyon mouth. Inventories varied 2-fold across years presumably attributed to enhanced riverine and bottom trawling sediment fluxes. Similar 234Th-derived sediment deposition patterns can be found in submarine canyons worldwide, highlighting the value of this radiotracer for sedimentary dynamics studies in such complex environments. |
| Ajuts: | Ministerio de Ciencia, Innovación y Universidades TED2021-129426B-I00 Agencia Estatal de Investigación PID2023-151302NA-I00 "la Caixa" Foundation 100010434 European Commission 847648 Ministerio de Ciencia, Innovación y Universidades CEX2019-000928-S-20-2 Generalitat de Catalunya 2021/BP-00109 Agencia Estatal de Investigación RYC2023-045355-I Generalitat de Catalunya 2022/BP-00112 Agencia Estatal de Investigación RYC2023-045093-I Ministerio de Ciencia e Innovación CEX2024-001494-S Ministerio de Ciencia e Innovación CEX2024-001506-M Generalitat de Catalunya 2021/SGR-433 Generalitat de Catalunya 2021/SGR-640 |
| Nota: | Unidad de excelencia María de Maeztu CEX2024-001506-M |
| Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Matèria: | 234Th ; Particle tracer ; Environmental radioactivity ; Submarine canyon ; Mediterranean Sea ; Recent sedimentation ; Surface sediment ; Mixing rate ; Riverine inputs ; Bottom trawling |
| Publicat a: | Journal of marine science and engineering, Vol. 13, Num. 12 (December 2025) , art. 2383, ISSN 2077-1312 |
18 p, 4.5 MB |