Spatial variability of organic matter and phosphorus cycling in Rhône River prodelta sediments (NW Mediterranean Sea, France): a data-model approach
The 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.
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Date | 2020-04-24 |
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Date type | Creation: Date identifies when the resource was brought into existence |
Date | 2020-06-05 |
Date type | Revision: Date identifies when the resource was examined or re-examined and improved or amended |
Date | 2021-05-15 |
Date type | Publication: Date identifies when the resource was issued |
Date type | Publication: Date identifies when the resource was issued |
Unique resource identifier | a53ad03f-3733-7333-3332-000000073204 |
Unique resource identifier |
Point of contact
Organisation name | SEA scieNtific Open data Edition |
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Delivery point | By address: IFREMER / IDM / SISMER - Scientific Information Systems for the SEA, IFREMER Centre de Bretagne, ZI Pointe du diable CS 10070 |
City | PLOUZANE |
Postal code | 29280 |
Country | France |
Electronic mail address | data@seanoe.org |
Linkage | https://www.seanoe.org/ |
Role | Publisher: Publisher |
Point of contact
Organisation name | Ifremer, Scientific Information Systems for the sea |
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Delivery point | IFREMER Centre de Bretagne ZI Pointe du diable CS 10070 |
City | PLOUZANE |
Postal code | 29280 |
Country | France |
Electronic mail address | sismer@ifremer.fr |
Linkage | http://data.ifremer.fr/SISMER |
Role | Dataset Holding Organisation: Dataset Holding Organisation |
Point of contact
Organisation name | Ifremer, Scientific Information Systems for the sea |
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Delivery point | IFREMER Centre de Bretagne ZI Pointe du diable CS 10070 |
City | PLOUZANE |
Postal code | 29280 |
Country | France |
Electronic mail address | sismer@ifremer.fr |
Linkage | http://data.ifremer.fr/SISMER |
Role | Author: Party who authored the resource |
Descriptive keywords
GEMET - INSPIRE themes, version 1.0 | |
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SeaVoX salt and fresh water body gazetteer |
Mediterranean Region
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Mediterranean Sea
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Mediterranean Sea, Western Basin
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SeaDataNet Agreed Parameter Groups | Sediment pore water chemistry |
SeaDataNet device categories | unconsolidated sediment corers |
SeaVoX Device Catalogue | Unspecified sediment corer |
SeaDataNet Parameter Discovery Vocabulary |
Dissolved oxygen parameters for sediments
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Metal concentrations in sediment pore waters
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Nutrient concentrations in sediment pore waters
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CRUISE SUMMARY REPORT INVENTORY (CSR) | 486_18000473 |
SeaVoX Platform Categories | research vessel |
MEDIN data format categories | Documents |
Character set | UTF8: 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646 |
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Reference System Information
Anchor | WGS 1984 |
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Hierarchy level | Dataset: Information applies to the dataset |
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Statement | Processed data|The 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. |
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File identifier | a53ad03f-3733-7333-3332-000000073204 | ||||||||||||||
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Metadata language | English | ||||||||||||||
Character set | UTF8: 8-bit variable size UCS Transfer Format, based on ISO/IEC 10646 | ||||||||||||||
Hierarchy level | Dataset: Information applies to the dataset | ||||||||||||||
Date stamp | 2024-04-23T00:00:00 | ||||||||||||||
Metadata standard name | ISO 19115:2003/19139 | ||||||||||||||
Metadata standard version | 1.0 | ||||||||||||||
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