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首页> 外文期刊>Estuarine Coastal and Shelf Science >Measurement of dissolved oxygen using optodes in a FerryBox system
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Measurement of dissolved oxygen using optodes in a FerryBox system

机译：在FerryBox系统中使用光电二极管测量溶解氧

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Optode sensors can provide detailed information on concentrations of dissolved oxygen, which in turn may be used to quantify variations in net primary productivity. Throughout 2005 and 2006 the performance of commercially available oxygen optodes was examined, one in each year. The optode was part of an autonomous measurement system (FerryBox) on a ferry operating between Portsmouth (UK) and Bilbao (Spain). On crossings during which water samples were collected manually, the optode outputs were compared to measurements of dissolved oxygen made by Winkler titrations. The optodes maintained good stability with no evidence of instrumental drift during the course of a year. Over the observed concentration range (230-330 mM m~(-3)) the optode data were approximately 2% low in both years. By fitting the optode data to the Winkler data the median difference between the optode and Winkler measurements is reduced to less than 1 mM m~(-3) (0.3%) in both years. The most appropriate calibration factor for 2005 was corrected O_2 = Optode O_2 × 1.018 and for 2006 the corresponding equation is corrected O_2 = Optode O_2 × 0.884 + 36.8. The standard deviation (95%) of the difference between the individual Winkler measurements was 5 mM m~(-3) and 3 mM m~(-3) in 2005 and 2006 respectively. Calculation of the oxygen saturation anomaly is required for calculation of the air sea exchange of oxygen and net biological production. This calculation requires the use of both salinity and temperature data. Salinity is measured to better than 0.1 so the corresponding error in anomaly is less than 0.2 mM m~(-3). Distortion of the temperature data is present due to warming of the water pumped to the optode. In winter this warming at the optode may be as great as 0.4 ℃. The difference in the pumped water temperature can be corrected for by reference to other measurements of sea surface temperature reducing the error to less than 1 mM m~(-3).
机译：光电传感器可以提供有关溶解氧浓度的详细信息，进而可以用来量化净初级生产力的变化。在整个2005年和2006年，每年都要检查一次商用氧气光电二极管的性能。该光电二极管是在朴茨茅斯（英国）和毕尔巴鄂（西班牙）之间运营的渡轮上的自主测量系统（FerryBox）的一部分。在人工收集水样的交叉口上，将光电二极管的输出与Winkler滴定法测量的溶解氧进行比较。光电二极管在一年的时间内保持良好的稳定性，没有仪器漂移的迹象。在观察到的浓度范围（230-330 mM m〜（-3））中，两年的光电二极管数据均低约2％。通过将光电二极管数据与Winkler数据拟合，在两年中，光电二极管和Winkler测量值之间的中值差异减小到小于1 mM m〜（-3）（0.3％）。对2005年最合适的校准系数进行了校正O_2 =光电二极管O_2×1.018，对于2006年，对相应的方程式进行了校正O_2 =光电二极管O_2×0.884 + 36.8。各个Winkler测量值之间的差异的标准偏差（95％）在2005年和2006年分别为5 mM m〜（-3）和3 mM m〜（-3）。计算空气中的氧气交换量和净生物产量需要计算氧饱和度异常。该计算需要使用盐度和温度数据。盐度测量结果优于0.1，因此相应的异常误差小于0.2 mM m〜（-3）。由于泵送至光电二极管的水变暖，因此温度数据存在失真。在冬季，光电二极管的这种变暖可能高达0.4℃。可以参考其他海表温度测量值来校正抽水温度的差异，从而将误差降低到小于1 mM m〜（-3）。

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