1. COM – LMGEM CPPM Tamburini C., Robert A., Fuda JL., Lefèvre D…
Data transfer between an autonomous oceanographic mooring line and the secondary junction box : Hydrology-O2 & Remineralisation
COM – LMGEM
Tamburini C., Robert A., Fuda JL., Lefèvre D…
CPPM
Billault M., Payre P., Arnaud K., Beurthey S. Curtil C. Escoffier S….

3. O2 in the Ocean
Deep
Ocean

4. Why monitoring Deep in situ Oxygen [AOU=f(t)]
To follow a decrease in oxygen concentration related to an increase in temperature (reducing the deep ocean ventilation), and linked to climate change
To follow the deep oxygen consumption due to biological activity leading to an increase in CO2 production in the deep ocean, linked to the oceanic carbon cycle, carbon exportation to the deep ocean.
AOU-T Diagram from Antares Site
May 2007, WMDW
T-S Diagram from Antares Site
May 2007 56 57 58 59 60 61 62 63 64 65 66
Obs Temp
t+ 0.01°C
t+ 0.05°C
AOU (µmol dm-3)
DAOU=f(t°C)
13.1
13.15
13.2
13.25
13.3
13.35
Temperature (°C) 4

5. Change in circulation, Heat flux or Biological oxygen demand ?

6. Bacteria O2 consumption in the deep ocean
In Situ long term survey of TS-O2
[O2] = in situ oxygen concentration
 O2 optode sensor
IODA6000
[O2] = f(T, S, p) & Biological activity
CTD
C* = O2 solubility
(Benson & Krause, DSR 1984)
Bacteria O2 consumption in the deep ocean
C* value will be determined during the deep-sea formation
at the ocean surface
Apparent Oxygen Utilisation (AOU) = C*- [O2]
AOU is providing an estimation of the biological oxygen consumption since the water has left the ocean surface. 6

7. Biological activity evaluation: different time scales
MW1, T, S, O2 O2
Obs [O2]
AOU
MW = Mode Water
Mixing Line
MW2, T, S, O2
T (°C)
In Situ O2 = Time integrated Biological Activity
Months to years, upon water circulation
AOU = Departure from mixing line
IODA = Oxygen dynamics : Biological Activity Daily to weekly scale 7

8. COM implication into IL07
COM is member of the ANTARES collaboration since nov'05 (Ravenna collaboration meeting)
videomonitoring camera  bioluminescence
MicroCAT CTD  T, S
O2 optode sensor (Aanderaa 3830)  [O2]
videomonitoring camera bioluminescence

9. IL07 Time series January – June 2008 – Floor 3 & 4 T S O2

10. IODA6000 v3.0 for ANTARES Line 12
2 O2 optode sensors: 1 internal and one external

12. BOUM Cruise – June July 2008 – Depth :100 m

13. Why AN ESONET DEMO PROJECT ?
Buoy
T, S O2
Currents
IODA
UVP
Xmissiometer
Data
Transmission
Antares
DataBase
Wireless
transmission
Acoustic releaser
JBX
Weight

14. IODA6000 v4.0, requirements: Alimentation: 12V / 250 mA
O2 optode Aanderaa:12V / 100 mA (continuous)
Motors: 12 V / 0.5 A (1 min d-1)
Readout: RS232
Weight: 4 kg in water / 7 kg in air
ANTARES "slow control" for driving, data storage, data access 14

15. Thank You

16. Link between OM and prokaryotes OM + O2 => CO2
Azam & Long (2001)

17. 2 years operation from 05 to 07
Interdisciplinary
Instrumentation line
Lines Std
MILOM
IL 07
Ligne 12
6 storeys with new devices:
Cameras O2
Hydrophones for
acoustic detection
Deployed in July 07
hydrophones CT
IODA (F25)
Seismometer (BSS)
Line with 3 storeys:
ADCP SV CT
C-Star
Seismometer
OMs
LOB
2 years operation from 05 to 07
14.5m
Camera
ADCP
Ligne 5 OM
80m
C-Star
Courantometer AquaDopp (F23) SV CT
14.5m
hydrophones
Ligne 4 O2
14.5m
SV–CTD (F24)
hydrophones
C-Star
80m
Camera
Extension OM
ADCP
hydrophone
98m
Secondary JB Pr …
Sismomètre