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Science Mission Task 3.2 Oxygen Consumption   

Science Mission results
The full report is downloadable as a pdf here, but key results are shown below.

The IODA₆₀₀₀ was set to run incubation of 120 hours(5 days) long. At the end of incubation, the incubation chamber opens fully and remains open for 3 hours. An in situ water sample is then enclosed in the chamber for the next 120 hour incubation period, and so on. Supplementary data were collected from an associated oxygen sensor (Aanderaa 3830) at 3 minutes intervals.

Oxygen concentration measured by the IODA6000 on ANTARES site between May 31st and December 8th 2008. Green line is the bulk in situ O2 concentration (external O2 optode sensor); Blue line is the concentration within the IODA6000 chamber; Pink line is the temperature measured by the internal optode sensor. A rupture of the optical-cable stopped the real-time acquisition between June 24th and September 6th 2008. NB: data are not validated. Data provided by the ANTARES collaboration

Oxygen concentration measured by the IODA6000 on ANTARES site between November 1st and December 1st 2008. Green line is the bulk in situ O2 concentration (external O2 optode sensor); Blue line is the concentration within the IODA6000 chamber; Pink and orange lines are respectively the temperature measured by the internal and the external optode sensors. Six cycles are presented here with the different respiration rates. NB: data are not validated. Data provided by the ANTARES collaboration

A new device (IODA₆₀₀₀) is being developed by CNRS, Marseille (Partner 8) to measure in situ oxygen consumption. This will be deployed first on the instrumental line of ANTARES connected to a shore station via optical cable and then subsequently at DYFAMED and at PAP to provide time varying measurements of oxygen consumption.

• Phase 1: mechanical electronic and biological validation of IODA₆₀₀₀.
• Phase 2: deployment of IODA₆₀₀₀ on moored lines at DYFAMED and PAP sites to compare O2 incubations and in situ O2 concentration variations.

Output: Temporal variability of in situ deep ocean oxygen consumption.