|
|
|
|
|
| Ait Ballagh, Fatima Ezzahra; Rabouille, Christophe; Andrieux Loyer, Francoise; Soetaert, Karline; Elkalay, Khalid; Khalil, Karima. |
| Sediments play an important role in dissolved inorganic phosphorus (DIP) recycling, which needs to be precisely quantified in eutrophic estuaries. A coupled field data and diagenetic modelling approach was used to study P dynamics in two estuaries (Elorn and Aulne, Brittany, France). An existing model (OMEXDIA) was extended with phosphorus (P) benthic cycle by adding dissolved inorganic phosphorus (DIP) and particulate P fractions (organic P, Fe-bound P and Ca-bound P). The model was fitted to pore water oxygen, nitrate, ammonium, oxygen demand units (reduced substances that were produced by the anoxic mineralization; Fe2+, Mn2+ and H2S; ODU), DIP, sediment organic P and C, Fe-bound P and Ca-bound P data from four seasons (February, May, July and October... |
| Tipo: Text |
Palavras-chave: Phosphorus; Estuarine sediments; Eutrophication; Diagenetic modelling; Fe-bound P formation-release; Ca-bound P precipitation. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00598/71041/73089.pdf |
| |
|
| |
|
|
| Nantke, Carla K. M.; Frings, Patrick J.; Stadmark, Johanna; Czymzik, Markus; Conley, Daniel J.. |
| Si fluxes from the continents to the ocean are a key element of the global Si cycle. Due to the ability of coastal ecosystems to process and retain Si, the ‘coastal filter’ has the potential to alter Si fluxes at a global scale. Coastal zones are diverse systems, sensitive to local environmental changes, where Si cycling is currently poorly understood. Here, we present the first palaeoenvironmental study of estuarine biogenic silica (BSi) fluxes and silicon isotope ratios in diatoms (δ30Sidiatom) using hand-picked diatom frustules in two sediment cores (CBdist and CBprox) from the Chesapeake Bay covering the last 12000 and 8000 years, respectively. Constrained by the well-understood Holocene evolution of the Chesapeake Bay, we interpret variations in Si... |
| Tipo: Text |
Palavras-chave: Diatoms; Estuarine sediments; Human impact; Si isotopes. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00589/70083/68065.pdf |
| |
|
|
|
