Quantifying Po-210/Pb-210 Disequilibrium in Seawater
The disequilibrium between lead-210 (Pb-210) and polonium-210 (Po-210) is increasingly used in oceanography to quantify particulate organic carbon (POC) export from the upper ocean. This proxy is based on the deficits of Po-210 typically observed in the upper water column due to the preferential rem...
| Autores: | , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:307049 |
| Acceso en línea: | https://ddd.uab.cat/record/307049 https://dx.doi.org/urn:doi:10.3389/fmars.2021.684484 |
| Access Level: | acceso abierto |
| Palabra clave: | Po/Pb disequilibrium Co-APDC Fe(OH) Marine chemistry Particle export Polonium isotopes Precipitation methods Radiochemistry |
| Sumario: | The disequilibrium between lead-210 (Pb-210) and polonium-210 (Po-210) is increasingly used in oceanography to quantify particulate organic carbon (POC) export from the upper ocean. This proxy is based on the deficits of Po-210 typically observed in the upper water column due to the preferential removal of Po-210 relative to (21)0Pb by sinking particles. Yet, a number of studies have reported unexpected large Po-210 deficits in the deep ocean indicating scavenging of Po-210 despite its radioactive mean life of similar to 200 days. Two precipitation methods, Fe(OH)(3) and Co-APDC, are typically used to concentrate Pb and Po from seawater samples, and deep Po-210 deficits raise the question whether this feature is biogeochemically consistent or there is a methodological issue. Here, we present a compilation of Pb-210 and Po-210 studies that suggests that Po-210 deficits at depths. |
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