Details of Spatial variability of organic matter and phosphorus cycling in Rhône River prodelta sediments (NW Mediterranean Sea, France): a data-model approach

Back

Dataset identification

Title of datasetSpatial variability of organic matter and phosphorus cycling in Rhône River prodelta sediments (NW Mediterranean Sea, France): a data-model approach
Narrative summary of datasetThe Mediterranean Sea (MS) is a large oligotrophic sea. Its productivity may be sensitive to riverine nutrient inputs. Understanding its productivity involves quantifying phosphorus (P) river supply which is crucial for calculating P mass balances in the anthropogenically disturbed sea. Yet the precise role of the deltaic filter is not known, especially concerning the  differential trapping/recycling of nutrients in deltaic sediments. A benthic dataset from the Rhône River prodelta was coupled to an early diagenetic model, including the benthic P cycle. The dataset comprised  porewater oxygen, nitrate, sulfate, dissolved inorganic carbon, ammonium, dissolved reduced and total iron, dissolved inorganic phosphorus (DIP) and solid data (organic carbon, Fe-bound P, Ca-bound P and organic P) for 9 stations from the Rhône River prodelta. The model results indicated that the intensity of biogeochemical processes occurring near the sediment–water interface decreased from the river mouth to the adjacent continental shelf. This decrease occurred according to OC fluxes to the seafloor, sedimentation rates and integrated rates of OC mineralization (from 160 mmol C m-2 d-1 near the mouth to 10 mmol m-2 d-1 on the shelf). The organic P mineralization was intense, especially near the river mouth (1196 µmol m-2 d-1), and its contribution to DIP release was large (> 90%). Fe-bound P had a key role in promoting Ca-bound P precipitation in anoxic sediments. These sediments played an important role as a source of regenerated DIP.A significant part of DIP was recycled to the overlying waters (72-94%), representing 25% of the riverine discharge input of DIP. While 6-28% of produced DIP was buried as Ca-bound P, which represented 3-6% of the riverine inputs. Important Note: This submission has been initially submitted to SEA scieNtific Open data Edition (SEANOE) publication service and received the recorded DOI. The metadata elements have been further processed (refined) in EMODnet Ingestion Service in order to conform with the Data Submission Service specifications.
Summary of processing methodologyThe Mediterranean Sea (MS) is a large oligotrophic sea. Its productivity may be sensitive to riverine nutrient inputs. Understanding its productivity involves quantifying phosphorus (P) river supply which is crucial for calculating P mass balances in the anthropogenically disturbed sea. Yet the precise role of the deltaic filter is not known, especially concerning the differential trapping/recycling of nutrients in deltaic sediments. A benthic dataset from the Rhône River prodelta was coupled to an early diagenetic model, including the benthic P cycle. The dataset comprised porewater oxygen, nitrate, sulfate, dissolved inorganic carbon, ammonium, dissolved reduced and total iron, dissolved inorganic phosphorus (DIP) and solid data (organic carbon, Fe-bound P, Ca-bound P and organic P) for 9 stations from the Rhône River prodelta. The model results indicated that the intensity of biogeochemical processes occurring near the sediment–water interface decreased from the river mouth to the adjacent continental shelf. This decrease occurred according to OC fluxes to the seafloor, sedimentation rates and integrated rates of OC mineralization (from 160 mmol C m-2 d-1 near the mouth to 10 mmol m-2 d-1 on the shelf). The organic P mineralization was intense, especially near the river mouth (1196 µmol m-2 d-1), and its contribution to DIP release was large (> 90%). Fe-bound P had a key role in promoting Ca-bound P precipitation in anoxic sediments. These sediments played an important role as a source of regenerated DIP.A significant part of DIP was recycled to the overlying waters (72-94%), representing 25% of the riverine discharge input of DIP. While 6-28% of produced DIP was buried as Ca-bound P, which represented 3-6% of the riverine inputs.
Cruise
  • 486_18000473
  • Start date2018-05-21
    End date2018-06-02

    Responsible organisations

    CountryFrance
    Organisation nameIfremer, Scientific Information Systems for the sea
    Role of organisationDataset Holding Organisation
    CountryFrance
    Organisation nameSEA scieNtific Open data Edition
    Role of organisationPublisher
    How to citeAit Ballagh Fatima Ezzahra, Rabouille Christophe, Andrieux-Loyer Françoise, Soetaert Karline, Lansard Bruno, Bombled Bruno, Monvoisin Gaël, Elkalay Khalid, Khalil Karima, Brethous Laurie, Villedieu Anouk (2020). Spatial variability of organic matter and phosphorus cycling in Rhône River prodelta sediments (NW Mediterranean Sea, France): a data-model approach. SEANOE. https://doi.org/10.17882/73204

    Dataset availability

    Original dataset download linkhttps://cloud.emodnet-ingestion.eu/index.php/s/AymMfT5Pg9sT3r2
    Dataset formatDocuments
    PDF
    Public accessNo limitations
    License for useCC-BY 4.0
    TypeDataset
    DOIhttps://doi.org/10.17882/73204

    Locations

    Map
    Latitude north boundary43.37922
    Longitude east boundary5.02361
    Latitude south boundary43.189
    Longitude west boundary4.657091
    Sea areaMediterranean Region
    Mediterranean Sea
    Mediterranean Sea, Western Basin

    Data types, collection and processing

    Observation typeSediment pore water chemistry
    ParameterDissolved oxygen parameters for sediments
    Metal concentrations in sediment pore waters
    Nutrient concentrations in sediment pore waters
    Instrument typeunconsolidated sediment corers
    Instrument nameUnspecified sediment corer
    Platform typeresearch vessel
    Platform nameTethys II
    Data quality processing informationProcessed data

    Process information

    Submitting organisationAtomic Energy and Alternative Energy Commission (headquarter)
    Submission identifier (UUID)a53ad03f-3733-7333-3332-000000073204
    Date of dataset creation2020-04-24
    Date of dataset revision2020-06-05
    Date of metadata creation2020-6-10
    Date of metadata latest revision2021-04-28
    Date of publishing2021-05-15
    Processing data centreIfremer, Scientific Information Systems for the sea
    Summary record-ID805