Temperature, salinity, dissolved oxygen, suspended particulate matter and fluorescence in surface waters of the Charente estuary (North East Atlantic, France)

There are at least a dozen small hyper-turbid estuaries facing the Bay of Biscay, geographically situated between the two major estuaries of the Gironde and the Loire. MAGEST and SYVEL high-frequency multi-site monitoring revealed that the Loire, and to a lesser extent the Gironde, are subject to summer hypoxia. These observations raised the question of the potential occurrence of hypoxia in the small estuaries in between, motivating an investigation of dissolved oxygen in one of them, the Charente estuary. Oxygen and salinity sensors were placed at L'Houmée (2019), Tonnay-Charente (2018; 2019), Rochefort (2020; 2021; 2022), Martrou (2020) during summer, the most critical period for dissolved oxygen; a multiparameter probe was placed at Tonnay-Charente from April to November 2020. Longitudinal investigations along the estuary axis were also carried out during the summers of 2018 and 2019. All the measurements were acquired at 0.5 ± 0.2 meters below the surface. The dataset enabled us to identify the occurrence of summer hypoxia and an oxygen depletion zone in the Charente estuary. These results resulted in the implementation of high-frequency monitoring at Tonnay-Charente, operational since November 2020.

Simple

Date (Publication)
2023-07-22
Date (Revision)
2024-04-17
Other citation details
Schmidt Sabine, Diallo Ibrahima (2023). Temperature, salinity, dissolved oxygen, suspended particulate matter and fluorescence in surface waters of the Charente estuary (North East Atlantic, France). SEANOE. https://doi.org/10.17882/95886
Credit
This work was a contribution to the project QUEtSCHE (trajectoires de la QUalité des eaux et du fonctionnement des écosystèmes des EStuaires aquitains face au CHangEment climatique) funded by the OASU (Aquitaine Observatory of the Sciences of the Universe) and the AEAG (Agence de l’Eau Adour Garonne).
Author
  CNRS, UMR5805 EPOC, France - Schmidt Sabine
Author
  Rectorat de Bordeaux - Diallo Ibrahima
Publisher
  SEANOE
Theme
  • estuary
  • Charente
  • surface water
  • temperature
  • salinity
  • dissolved oxygen
  • suspended particle
  • fluorescence
  • Chemical oceanography
ODATIS aggregation parameters and Essential Variable names
SeaDataNet Parameter Disciplines
Type de jeux de donnée ODATIS
Use limitation
CC-BY-NC (Creative Commons - Attribution, No commercial usage)
Use constraints
Other restrictions
Date (Publication)
2024
Publisher
  Copernicus GmbH
Author
  Schmidt Sabine
Author
  Diallo Ibrahima Iris
Unique resource identifier
10.5194/bg-21-1785-2024
Association Type
Cross reference
Initiative Type
Study
Date (Publication)
2023
Publisher
  Copernicus GmbH
Author
  Schmidt Sabine
Author
  Diallo Ibrahima I.
Unique resource identifier
10.5194/bg-2023-150
Association Type
Cross reference
Initiative Type
Study
Metadata language
English
Topic category
  • Oceans
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Begin date
2018-07-19
End date
2020-11-16
Distribution format
  • CSV ( )

OnLine resource
Quality controlled data ( WWW:DOWNLOAD-1.0-link--download )

Salinity, temperature and dissolved oxygen in surface water at L'Houmée [RESTRICTED] - 523 KB

OnLine resource
Quality controlled data ( WWW:DOWNLOAD-1.0-link--download )

Salinity, temperature, dissolved oxygen, suspended particulate matter and fluoresence in surface water at Tonnay-Charente [RESTRICTED] - 3 MB

OnLine resource
Quality controlled data ( WWW:DOWNLOAD-1.0-link--download )

Salinity, temperature and dissolved oxygen in surface water at Rochefort [RESTRICTED] - 1 MB

OnLine resource
Quality controlled data ( WWW:DOWNLOAD-1.0-link--download )

Salinity, temperature and dissolved oxygen in surface water at Martrou [RESTRICTED] - 242 KB

OnLine resource
Quality controlled data ( WWW:DOWNLOAD-1.0-link--download )

Longitudinal transects in the Charente estuary in summer 2018 and 2019 [RESTRICTED] - 12 KB

OnLine resource
DOI of the product ( WWW:LINK-1.0-http--metadata-URL )
OnLine resource
Seanoe ( rel-canonical )
Hierarchy level
Dataset
Statement
Measurements were taken using HOBO U26 Dissolved Oxygen and U24 Conductivity/Salinity loggers, except at Tonnay-Charente in 2020 where a SAMBAT multiparameter probe (NKE Instrumentation, France) was deployed. The measured parameters are temperature (−-5 to +35°C; ± < 1%), salinity (range 0.1 -42; ± < 5%), turbidity (Turner Designs CYCLOPS-7; 0 - 3000 NTU; ± < 5%) converted in suspended particulate matter (SPM using a NTU-SPM rating curve established for Charente SPM, dissolved oxygen (0 - 20 mg L-1;  ±0.1 mg L-1) and fluorescence (Turner Designs CYCLOPS-70 - 50 µg L-1; ± < 5%).
File identifier
seanoe:95886 XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2024-04-17
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
1.0
Point of contact
  CNRS, UMR5805 EPOC, France - Schmidt Sabine
 
 

Overviews

overview
The SAMBAT multiparameter probe on the floating pontoon of Tonnay-Charente in 2020

Spatial extent

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Keywords

Charente Chemical oceanography dissolved oxygen estuary fluorescence salinity surface water suspended particle temperature
ODATIS aggregation parameters and Essential Variable names
Dissolved oxygen Fluorescence Salinity Sea temperature Suspended matter
Type de jeux de donnée ODATIS
/Observational data/in-situ

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