CARIOCA is an automatic drifting or fixed buoy designed to measure the concentration of pCO2 at the surface of the ocean in order to qualify the CO2 exchange between atmosphere and ocean. The buoy is equipped with the pCO2 sensor of NKE Instrumentation that used a revolutionary approach based on spectrophotometry.

CARIOCA buoy performs hourly measurements of several parameters:

 Concentration of seawater dissolved pCO2

 Sea Surface Temperature (SST)

 Practical Salinity


 Air temperature

 Atmospheric pressure

 Dissolved Oxygen


Features and benefits

  • CO2 partial pressure in seawater
  • One year operating autonomy
  • One measurement per hour
  • Chlorophyll, Barometric pressure, Wind speed, Air and Water temperature, Dissolved Oxygen
  • Examples of use

  • oceans
  • Technical data

  • CO2 partial pressure (pCO2):
    Range: 250 to 550 µatm
    Initial accuracy: +/- 3µatm
  • Internal temperature:
    Range: -2 to +32°C
    Initial accuracy: +/-0.01°C
  • Chlorophyll:
    Range: 0.03 to 75µg/l
    Sensitivity: 0.03µg/l
  • Wind speed:
    Range: 0.01 to 60 m/s
    Initial accuracy:
    +/-3% 0.01 m/s to 40m/s
    +/-5% 0.01 m/s to 40 m/s
  • Air temperature:
    Range: -40 to 70°C
    Initial accuracy: +/-0.3°C @ 20°C
  • Barometric pressure:
    Range: 300 to 1100 hPa
    Initial accuracy: +/-0.5 hPa @ 25°C
  • Conductivity:
    Range: 0 to 65.5 mS/cm
    Initial accuracy: +/-0.003 mS/cm
  • Temperature:
    Range: +/-0.002 (-5 to 35°C)
    Initial accuracy: +/-0.01 (35 to 45°C)
  • Dissolved Oxygen (DO):
    Range: 0 to 500 µmol/l
    Initial accuracy: <8µmol/l
  • Water temperature:
    Range: 0 to 36°C
    Initial accuracy: +/-0.1°C
  • Electric autonomy: one-year
  • Measurement frequency: one measurement per hour
  • Data transmission: ARGOS system
  • Water circulation: Electrical pump
  • Mechanical:
    Weight: 130 kg (including yellow floating body)
    Height: 2.5m
    Hull diameter: 0.2m
    Float diameter 0.6m
  • Downloads