Editing Specification report of common test protocols and intercomparison methodologies

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During R/V SONNE Cruises SO234/2 and SO235 (July/Aug. 2014), a HydroC pCO<sub>2</sub> sensor was operated continuously on pumped surface seawater in a flow-through tank. The sensor-based pCO<sub>2</sub> measurements agree to within 3 µatm with the reference system (Fig. 4). This confirms earlier findings that measurements with the HydroC pCO<sub>2</sub> sensor can be made with an estimated accuracy of ≤ 3 µatm. Such high quality, however, is only achievable under the following tightly constrained operation conditions: (i) the sensor has to undergo individual multi-point calibration (e.g., by manufacturer) prior to field deployment, (ii) the auto zero function of the sensor has to be used frequently (i.e., at least every 12 h) throughout the deployment to correct for the zero drift, (iii) the sensor has to undergo a post-deployment calibration under the same conditions as the pre-deployment calibration, (iv) the span (response) drift of the sensor has to be corrected for by using the pre- and post-deployment calibration results and by making the correction factor itself a function of the zero drift of the sensor.
 
During R/V SONNE Cruises SO234/2 and SO235 (July/Aug. 2014), a HydroC pCO<sub>2</sub> sensor was operated continuously on pumped surface seawater in a flow-through tank. The sensor-based pCO<sub>2</sub> measurements agree to within 3 µatm with the reference system (Fig. 4). This confirms earlier findings that measurements with the HydroC pCO<sub>2</sub> sensor can be made with an estimated accuracy of ≤ 3 µatm. Such high quality, however, is only achievable under the following tightly constrained operation conditions: (i) the sensor has to undergo individual multi-point calibration (e.g., by manufacturer) prior to field deployment, (ii) the auto zero function of the sensor has to be used frequently (i.e., at least every 12 h) throughout the deployment to correct for the zero drift, (iii) the sensor has to undergo a post-deployment calibration under the same conditions as the pre-deployment calibration, (iv) the span (response) drift of the sensor has to be corrected for by using the pre- and post-deployment calibration results and by making the correction factor itself a function of the zero drift of the sensor.
  
''Significant results''
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===Significant results===
  
 
The following results can be considered robust and significant:
 
The following results can be considered robust and significant:

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