General information or Introduction section
Sediment Traps and Sample CollectionSinking particulate matter was collected from January 2020 to December 2024 using cylindrical sediment traps (aspect ratio 10.9) deployed near the LéXPLORE platform at depths of 10, 30, 50, and 100 meters. Traps were retrieved twice monthly during summer months (June to September) and monthly otherwise. Contents were freeze-dried and weighed, and mass fluxes were calculated based on the dry mass, trap area, and deployment duration. Some temporal gaps occurred in sampling, notably from November 2021 to May 2022.
Sample Processing and Chemical AnalysesSediment samples were milled and analyzed for total nitrogen, total phosphorus, total organic and inorganic carbon, and major element concentrations (Ca, Mg, Al, Fe, K, Mn, Ti, Sr, Ba) at Eawag. Elemental carbon and nitrogen were measured with combustion elemental analyzers, phosphorus via flow-injection photometric analysis, and major elements using ICP-MS following acid digestion. Elemental fluxes were derived from concentration measurements combined with mass flux data.
Mass Balance and Fractional ContributionsThe dataset includes calculated fluxes for biomass, calcite (as CaCO₃), and mineral oxides typical of Rhône sediments. Biomass flux is estimated from organic elemental composition and stoichiometric ratios, while calcite flux is based on inorganic carbon measurements. Mineral oxide contributions (e.g., MgO, Al₂O₃, Fe₂O₃) were derived using conversions established for Rhône river sediments.
- author(s) info: Natacha Pasche, EPFL ENAC Limmnology Center, Guillaume Cunillera, EPFL ENAC Limmnology Center, Jérémy Keller, EPFL ENAC Limmnology Center- date of collection (dd.mm.yyyy): 18.12.2019 to 15.01.2025- geolocation data (use format): LéXPLORE platform, Lake Geneva, Switzerland. Coordinates: latitude 46°30'0.819" N and longitudes, 6°39'39.007" E. Depths: 10, 30, 50, and 100 m below water surface.- funding or sponsorship info: EPFL ENAC Limnology Center for the SEDTRAP project
Sharing / Access information or License section- licenses: CC-BY- terms of use: The datasets generated during and/or analysed during the current study are available in the Zenodo repository, 10.5281/zenodo.17607859.- citation instructions: Cite as: Pasche Natacha, Cunillera Guillaume, Keller Jérémy:(2025). Sediment traps dataset at LéXPLORE Platform (2020–2024): Fluxes for total mass, carbon-nitrogen-phosphorus content, and metal analyses in Lake Geneva.[Dataset]. EPFL. 10.5281/zenodo.17607859- links to related publications: Faval E, Cunillera G, Keller J, Dubois N, Janssen DJ, Pasche N. (2025) Rivers beneath the surface: how riverine inputs shape sedimentation in a large peri-alpine lake, submitted to Aquatic Sciences- links to other research outputs and datasets: LéXPLORE thermistor chain: https://www.datalakes-eawag.ch/datadetail/448, LéXPLORE CTD profiles: https://www.d
