You are viewing an old version of this page. View the current version.

Compare with Current View Page History

« Previous Version 63 Next »

Attention:

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.

Summary

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.

Manufacturer subCtech GmbH
Model OceanPack SAE pCO2 Analyzer
Serial No. n/a
Type pCO2 Sensor
SENSOR-Link ↪

Contacts

Name Institution Role
Mario Hoppema Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research Principal Investigator, Data Scientist
Thomas Liebe F. Laeisz Engineer In Charge

Components

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.

Position

Infono xyz-position given, device located in G707

Data logging, storage and archiving

Logged parameters

Parameter Sensor Output Type Unit
CO2 air CO2 ppm
CO2 corrected water CO2 ppm
H2O air wet bulk density ppt
H2O density wet bulk density μmol/m3
xCO2 dry CO2 μmol/mol
CO2 density CO2 μmol/m3

Central geographical ship's position and time standard

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

Rawdata storage on board

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

Dship

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]

Data archiving on land

After the cruise the (uncorrected) DShip data set can be extracted from https://dship.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

Documentation

  • No labels

null