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Please note: The system runs continuously during all cruises. Support is given by the board electricians. Plaease ask them if you need specific info, or contact the responsible AWI scientist.

The OceanPack Sea-Air-Exchange system measures the partial pressure of CO2 (pCO2) in seawater using membrane equilibration and Li-cor IR analyser for CO2 detection. The instrument reports mole fraction of CO2 in wet air in ppm. Values of pCO2 in microatm can only be obtained with shore-based data processing.

The system consists of a flow-through unit for CO2 extraction at a membrane and CO2 detection by a Li-cor Infra Red (IR) analyser. The instrument reports "mole fraction of CO2 in wet air [ppm]". Values of "pCO2 [µatm] can only be obtained with shore-based data processing.

Time synchronising is regulated via DShip.
Geographical ship's position via DShip.

Data storage in the instrument itself and in the DShip system.

Uncorrected measurement data.

|| Device name | OceanPack pCO2 Analyzer || 
|| Parameters| xCO2 (air) \[ppm\]; xCO2 corrected (water) \[ppm\]; CO2 concentration\[mmol/m3\]; pressure difference (membrane; licor) \[mbar\]; xH2O (air) \[ppt\]; H2O concentration \[mmol/m3\]; xCO2 dry \[µmol/mol\] ||

After the cruise the (uncorrected) DShip data set can be extracted from https://dms.awi.de.
Data must be corrected before final use. Corrected data can only be obtained after on land processing.

|| File format(s) | stored in DShip system || 
|| Calibration certificates | NO ||

• Factsheet: pCO2 Analyser on R.V. Polarstern (Article, 28 kB)
    Factsheet for pCO2 Analyser on board of R.V. Polarstern
• OceanPack RACK MK-2 datasheet (Factsheet, 325 kB)