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Driftende Bojen

Folgende Systeme sind entwicklet worden. Für Detailinformationen klicken Sie bitte auf die entsprechende Registerkarte. Die Gerätespezifikationen sind z.Z. noch in englischer Sprache. Die deutsche Version wird in Kürze verfügbar sein.

The SC 40 and SC40 G drifting buoys are ocean floats that use the moving satellites from the ARGOS system to position themselves and collect their data.

Thanks to their highly optimised cost, these floats can be used for scientific experiments as current sensors and can therefore be equipped with a "Holey Sock" drogue (optional).

Characteristics

The SC 40 buoy measures and sends the surface temperature of the ocean at each transmission; it has a one-year electric autonomy.

The SC 40 G buoy is fitted with a GPS receiver, which activates on a regular basis (15, 20, 30, 60 or 120 minutes). The positions are memorised and form a trail that allows the complete and regular tracking of the buoys thanks to the moving satellites of the ARGOS system. A sensor used to detect the presence of seawater on top of the buoy allows the drogue to be detected by sending the ratio of immersion and emergence periods.

SVP: Surface velocity Program

 

Atmospheric CO2 is one of the elements responsible for the greenhouse effect on Earth. The way its concentration evolves has significant consequences on the climate of our planet. Oceans are known to act as both CO2 sinks and sources, and for the essential, though badly quantified, role they play in the evolution of atmospheric CO2. It is critical to better understand and characterise the gas exchange process between the atmosphere and the ocean. The concentration in atmospheric CO2 is relatively well known, and that of the ocean must be accurately measured.

Given the great space and time variability of dissolved CO2 at the surface of the ocean, an experimental approach aimed at acquiring series of measurements can be adopted using drifting platforms, such as the CARIOCA buoy, in order to complement the data acquired with ships and anchored buoys.

Reference to the article: New in situ estimates of carbon biological prodution rates in southern Ocean from Carioca drifter measurements by J Boutin et L. Merlivat ( Geophysical Research letter vol 36 L13608 - 2009)

CARIOCA is an automated drifting buoy that measures the partial pressure of dissolved CO2 in seawater in order to quantify air/ocean exchanges. pCO2 is measured in liquid phase by colorimetry on a reagent using a 3-wavelength spectrophotometer with a 4 µatm accuracy.

Characteristics:


Other measurements are integrated on the buoy.

chlorophyll A by fluorescence,
atmospheric pressure,
wind speed,
surface temperature,
surface salinity,
dissolved oxygen (optionnal)

The buoy is autonomous, data are sent via the ARGOS satellite system, which also controls the positioning. The buoy's autonomy is one year based on an hourly measurement rate.

Measuring campaigns have been carried out in the Mediterranean, Greenland Sea, Equatorial Pacific and the Antarctic. The CARIOCA project is part of the EUREKA EU 819 programme.

 
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