Vertical distributions of temperature, salinity, dissolved oxygen concentrations and saturations, Chl-a, turbidity and pH in the water column of the continental shelf off the Gironde (North East Atlantic, France)

Date 2022-07
Temporal extent 2016-10-25 -2021-10-28
Author(s) Dubosq NicolasORCID1, Schmidt SabineORCID2, Deflandre BrunoORCID1
Affiliation(s) 1 : Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, F-33600 Pessac, France
2 : CNRS, Univ. Bordeaux, Bordeaux INP, EPOC, UMR 5805, F-33600 Pessac, France
DOI 10.17882/89508
Publisher SEANOE
Keyword(s) continental shelf, Bay of Biscay, Riomar, West Gironde Mud Patch, water column, temperature, salinity, dissolved oxygen, Chl-a, turbidity, pH
Abstract

The aim of this work was to document the seasonal and inter-annual dynamic of dissolved oxygen and ancillary data (T, S, Chl-a, turbidity, pH) along a cross-shelf transect off the Gironde estuary. This work has been motivated by recent simulations that suggest the occurrence of seasonal bottom deoxygenations in this River-dominated Ocean Margin (Riomar); but unfortunately there were no data sets to test this hypothesis until now. Profiles of temperature, salinity and dissolved oxygen were performed in the water column of the West Gironde Mud Patch off the Gironde estuary (from 45°46.383’N – 1°28.925’W to 45°35.524’N - 1°50.689’W) during seven cruises on the R/V Côte de la Manche (doi: 10.18142/284 ; 10.17600/18000861) between 2016 and 2021 (October 2016, August 2017, January 2018, April 2018, July 2019, April 2021, October 2021). Turbidity was measured in January and April 2018, July 2019 and October 2021, Chl-a in October 2016, August 2017, January 2018, April 2018 and July 2019 and pH in October 2021. This dataset had permitted to validate the occurrence of bottom deoxygenations when the water column is stratified.

Licence CC-BY-NC
Acknowledgements We sincerely acknowledge the captains and crews of the R/V “Côtes de la Manche” (CNRS-INSU) for their great help during the cruises. This work was supported by: (1) the JERICO-NEXT project (European Union's Horizon 2020 Research and Innovation program under grant agreement no. 654410), (2) the LEFE- EC2CO VOG project, and (3) the MAGMA project (LabEx COTE, ANR-10-LABX-45; Nouvelle-Aquitaine Regional Council; French Biodiversity Agency). A doctoral fellowship was provided to N. Dubosq by the French Ministry of Higher Education, Research and Innovation.
Sensor metadata

The measurements were performed using a SeaBird SBE-19plus, a Wimo Plus multiparameter probe (NKE Instrumentation) and autonomous sensors (STPS, SDOT and STBD, NKE Instrumentation). The measured parameters were temperature (SeaBird SBE-19plus: -5 to +35°C, <±1%; STPS: -5 to +35°C, <± 1% ; Wimo Plus: -2 to +35°C, ±0.02°C), salinity (SeaBird SBE-19plus: 2 – 42 , <±1% ; STPS: 2 - 42, <±1% ; Wimo Plus: 2 – 42, ±0.1%), dissolved oxygen (SDOT: 0 – 500µM, 0 – 150%, <±5% ; Wimo Plus: 0 – 700µM, 0 – 250%, <±1%), turbidity (STBD: 0 – 2000 NTU, <±5%, Wimo Plus: 0 – 4000 NTU, <±5%), Chl-a (SeaBird SBE-19plus: 0.03 – 75 µg/L, <±5%) and pH (Wimo Plus: 0 – 14, ±0.1). Turbidity sensors were intercalibrated using formazin, allowing to provide turbidity data in Formazin Nephelometric Units (FNU). Missing data are replaced by the value “-9999”.

Data
File Size Format Processing Access
1 MB CSV Quality controlled data Access on demand until 2024-07-01
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How to cite 

Dubosq Nicolas, Schmidt Sabine, Deflandre Bruno (2022). Vertical distributions of temperature, salinity, dissolved oxygen concentrations and saturations, Chl-a, turbidity and pH in the water column of the continental shelf off the Gironde (North East Atlantic, France). SEANOE. https://doi.org/10.17882/89508