Processing of Underway CTD Data
Processing of Underway CTD Data
复制标题
正在进行的 CTD 数据处理
DOI：
10.1175/jtech-d-13-00200.1
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发表时间：
2014
影响因子：
2.2
通讯作者：
D. Hebert
中科院分区：
文献类型：
--
作者：
D. Ullman;D. Hebert
本文提出了一种利用在航CTD（UCTD）测量值计算精确盐度的处理方法。UCTD是一种快速分析传感器包，没有泵，泵依赖于仪器运动来产生通过电导池的流动。在可变的仪器下降速率下，通过池的流量不是恒定的，这对处理具有重要意义。正如预期的那样，发现原始温度和电导率的不对准是仪器下降速率的函数。应用恒定的时间提前的电导率或温度，如与泵的CTD所做的，产生不可接受的盐度尖峰。随着UCTD的下降速率达到4 dbar s-1以上，热敏电阻的粘性加热效应显示出产生高达0.005 psu的显着盐度误差，并根据以前的实验室工作进行校正。并对电导池热质量引起的误差进行了修正。
AbstractA processing methodology for computation of accurate salinity from measurements with an underway CTD (UCTD) is presented. The UCTD is a rapidly profiling sensor package lacking a pump that relies on instrument motion to produce flow through the conductivity cell. With variable instrument descent rate, the flow through the cell is not constant, and this has important implications for the processing. As expected, the misalignment of the raw temperature and conductivity is found to be a function of the instrument descent rate. Application of a constant temporal advance of conductivity or temperature as is done with pumped CTDs is shown to produce unacceptable salinity spiking. With the descent rate of the UCTD reaching upwards of 4 dbar s−1, the effect of viscous heating of the thermistor is shown to produce a significant salinity error of up to 0.005 psu, and a correction based on previous laboratory work is applied. Correction of the error due to the thermal mass of the conductivity cell is achieve...