A new device to follow temporal variations of oxygen demand in deltaic sediments: the LSCE benthic station

Type Article
Date 2014-11
Language English
Other localization http://www.aslo.org/lomethods/free/2014/0729.html
Author(s) Toussaint Flora1, Rabouille Christophe1, Cathalot Cecile1, Bombled Bruno1, Abchiche Abdel2, Aouji Oualid2, Buchholtz Gilles2, Clemencon Aurelien2, Geyskens Nicolas2, Repecaud MichelORCID3, Pairaud IvaneORCID4, Verney RomaricORCID5, Tisnerat-Laborde Nadine1
Affiliation(s) 1 : CEA, CNRS, UVSQ Terrasse, Lab Sci Climat & Environm UMR 8212, F-91190 Gif Sur Yvette, France.
2 : CNRS, DT INSU, Div Inst Natl Sci Univ, F-92195 Meudon, France.
3 : IFREMER, LDCM, F-29280 Plouzane, France.
4 : IFREMER, LER PAC, F-83507 La Seyne Sur Mer, France.
5 : IFREMER, DYNECO PHYSED, F-29280 Plouzane, France.
Source Limnology And Oceanography-methods (1541-5856) (Amer Soc Limnology Oceanography), 2014-11 , Vol. 12 , P. 729-741
DOI 10.4319/lom.2014.12.729
WOS© Times Cited 13
Abstract A new benthic station equipped with oxygen microelectrodes and environmental sensors was developed by Laboratoire des Sciences du Climat et de L’Environnement (LSCE) and Division Technique of the Institut National des Sciences de L’Univers (DT-INSU) to perform in situ time series monitoring of sediment oxygen demand, linked to the mineralization of organic matter. The time series typically cover periods of 2-3 months, with a base frequency of 1 set of oxygen profiles per day. The profiling head assessed the lateral heterogeneity of the sediment oxygen demand at the beginning of the time series over a 0.8-m long rectangle to discriminate spatial and temporal variability. A continuous recalibration is performed using a moored oxygen optode anchored to the benthic station together with a set of environmental sensors. These sensors (turbidity, temperature, salinity, and oxygen) can trigger a high-frequency profiling mode to investigate the fate of particulate organic matter delivered during floods, resuspension, and deposition events. Deployments of the benthic station were performed in the Rhone River subaqueous delta (Mediterranean Sea). We show that “stable” periods (when neither floods nor storms occur) were characterized by a stable oxygen demand. In the case of resuspension events, an increase of the sediment oxygen demand by a factor of 2-3 with a relaxation time of 1 day was observed, indicating that the new benthic station can adequately capture the impact of resuspension events on the oxygen demand in deltaic sediments.
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Toussaint Flora, Rabouille Christophe, Cathalot Cecile, Bombled Bruno, Abchiche Abdel, Aouji Oualid, Buchholtz Gilles, Clemencon Aurelien, Geyskens Nicolas, Repecaud Michel, Pairaud Ivane, Verney Romaric, Tisnerat-Laborde Nadine (2014). A new device to follow temporal variations of oxygen demand in deltaic sediments: the LSCE benthic station. Limnology And Oceanography-methods, 12, 729-741. Publisher's official version : https://doi.org/10.4319/lom.2014.12.729 , Open Access version : https://archimer.ifremer.fr/doc/00230/34126/