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A method for in-situ calibration of Aanderaa oxygen sensors on surface moorings

机译：一种在表面系泊处对Aanderaa氧气传感器进行原位校准的方法

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摘要

Oxygen-based mass balance estimates of net biological production can be calculated using accurate in-situ O_2 measurements. All presently available oxygen sensors drift if deployed for periods of months in the sun-lit surface ocean and must be calibrated to maintain accuracy. We have developed an in-situ calibration system in which Aanderaa optode oxygen sensors periodically determine the pO_2 of air. In the moored application described here, the optode is housed in a subsurface chamber on a surface mooring where it alternately measures the pO_2 of the water and air. During calibration intervals, atmospheric air is pumped into the optode housing, displacing the water. Subsequent oxygen measurements of the air inside the housing provide a measurement of the atmospheric pO_2, which can then be compared to expected atmospheric pO_2 based on measured pressure and temperature. We present calibrations for one optode in both water (against Winkler titrations) and air (against atmospheric oxygen). The optode response in lab experiments was different in air than in water, measuring low and exhibiting temperature dependence (-1% at 20 ℃ and -2.3% at 3 ℃). Initial field tests in a freshwater inlet confirmed this offset and showed a drift of - 0.5% over 3 months of deployments.
机译：可以使用准确的原位O_2测量值来计算净生物生产的基于氧气的质量平衡估计值。如果所有现有的氧气传感器在阳光照射下的海洋中部署数月，它们都会漂移，并且必须进行校准以保持精度。我们开发了一种现场校准系统，其中Aanderaa optode氧气传感器定期确定空气的pO_2。在此处所述的系泊应用中，将光电二极管容纳在表面系泊系统的地下室中，在该系泊机中交替测量水和空气的pO_2。在校准间隔期间，大气被泵送到optode外壳中，从而排出水。壳体内部空气的后续氧气测量结果提供了大气pO_2的测量值，然后可以根据测得的压力和温度将其与预期的大气pO_2进行比较。我们在水（针对Winkler滴定）和空气（针对大气氧气）中均针对一个光电二极管进行了校准。实验室实验中的光电二极管响应在空气中与水中不同，测量结果较低，并且表现出对温度的依赖性（20℃时为-1％，3℃时为-2.3％）。最初在淡水进口处进行的现场测试证实了这种偏移，并且在部署的3个月中显示出-0.5％的漂移。

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