Air calibration of an oxygen optode on an underwater glider
Air calibration of an oxygen optode on an underwater glider
复制标题
水下滑翔机氧气光极的空气校准
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Melanie Feen
中科院分区：
文献类型：
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作者：
D. Nicholson;Melanie Feen
Aanderaa Data Instruments 4831 氧气光极配置在水下滑翔机上，使得光极在每个滑翔机水面间隔期间延伸到大气中，从而能够通过直接测量大气中已知的氧分压来对传感器进行原位校准。该方法之前曾在剖面浮标上实施过，但没有在滑翔机上实施过，在 2016 年 6 月新英格兰陆架断裂处的 15 天部署期间进行了测试，在此期间表面 O2 饱和度平均为 110%。结果通过船上 Winkler O2 校准模型进行验证，该校准模型用于确定传感器增益系数为 1.055±0.004。与剖面浮标观测结果一致，空气测量结果包含传感器表面溅水和/或残留海水的污染。滑翔机表面测量结果被确定为 36% 的地表水和 64% 的大气的线性组合。当针对这种影响校正空气测量值时，通过将滑翔机空气测量值与根据附近 NOAA 浮标的大气压力和湿度数据计算出的预期大气 pO2 进行比较，计算出传感器增益校正为 1.055±0.005。因此，这两种方法是一致的，并且都被证明精确度在±0.5%以内。我们预计，通过增加光极的垂直定位、延长部署时间或在表面 O2 饱和度接近平衡的水域中运行，可以进一步减少空气校准的不确定性。
An Aanderaa Data Instruments 4831 oxygen optode was configured on an underwater glider such that the optode extended into the atmosphere during each glider surface interval enabling in situ calibration of the sensor by directly measuring the known oxygen partial pressure of the atmosphere. The approach, which has previously been implemented on profiling floats but not on gliders, was tested during a 15‐d deployment at the New England shelf break in June 2016, a productive period during which surface O2 saturation averaged 110%. Results were validated by shipboard Winkler O2 calibration casts, which were used to determine a sensor gain factor of 1.055 ± 0.004. Consistent with profiling float observations, air measurements contain contamination from splashing water and/or residual seawater on the sensor face. Glider surface measurements were determined to be a linear combination of 36% of surface water and 64% atmospheric air. When correcting air measurements for this effect, a sensor gain correction of 1.055 ± 0.005 was calculated based on comparing glider air measurements to the expected atmospheric pO2 calculated from atmospheric pressure and humidity data from a nearby NOAA buoy. Thus, the two approaches were in agreement and were both demonstrated to be accurate to within ±0.5%. We expect uncertainty in the air‐calibration could be further reduced by increasing the vertical positioning of the optode, lengthening deployment time, or operating in waters with surface O2 saturation closer to equilibrium.
氧光极在分析平台上的时间响应及其对流速和温度的依赖性
DOI：
10.4319/lom.2014.12.617
发表时间：
2014
期刊：
Limnology and Oceanography: Methods
影响因子：
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作者：
Bittig;B. Fiedler;R. Scholz;G. Krahmann;A. Körtzinger
通讯作者：
A. Körtzinger