TY - JOUR
AU - Körtzinger, Arne
AB - This paper presents a detailed quality assessment of a novel underwater sensor for the measurement of CO 2 partial pressure ( p CO 2 ) based on surface water field deployments carried out between 2008 and 2011. The commercially available sensor, which is based on membrane equilibration and nondispersive IR (NDIR) spectrometry is small and can be integrated into mobile platforms. It is calibrated in water against a proven flow-through p CO 2 instrument within a custom-built calibration setup. The aspect of highest concern with respect to achievable data quality of the sensor is the compensation for signal drift inevitably connected to absorption measurements. Three means are used to correct for drift effects: (i) a filter correlation or dual-beam setup, (ii) regular zero gas measurements realized automatically within the sensor, and (iii) a zero-based transformation of two sensor calibrations flanking the time of sensor deployment. Three sensors were tested against an underway p CO 2 system during two major research cruises, providing an in situ temperature range from 7.4° to 30.1°C and p CO 2 values between 289 and 445 μ atm. The average difference between sensor and reference p CO 2 was found to be −0.6 ±3.0 μ atm with an RMSE of 3.7 μ atm.
TI - In situ Quality Assessment of a Novel Underwater p CO 2 Sensor Based on Membrane Equilibration and NDIR Spectrometry
JO - Journal of Atmospheric and Oceanic Technology
DO - 10.1175/JTECH-D-13-00083.1
DA - 2013-04-22
UR - https://www.deepdyve.com/lp/american-meteorological-society/in-situ-quality-assessment-of-a-novel-underwater-p-co-2-sensor-based-5yDgavzK75
SP - 181
EP - 196
VL - 31
IS - 1
DP - DeepDyve
ER -