Evaluation of Methods for Long-term Conductivity Measurements for the World Ocean Circulation Experiment (WOCE)

该项目涉及传感器和记录系统 需要对水进行长期的原位测量 特性. 获得所需的主要问题 精度（盐度约为0.01 ppt）是 电导率测量 首席研究员已经 在过去的15年里， 多年来，他一直使用电极和电感传感器。 在 在深海，已经观察到非常小的漂移， 几个月，但在浅水沃茨，漂移大到 0.1在盐度的PPT发生在几个月。 四项工作 将进行：（1）电导率传感器的性能 将总结各种配置和位置，（ii） 将研究空间和时间混叠误差， (iii)将估计采样和数字化精度， (iv)将导出功率预算和存储器大小。

This project addresses the sensors and recording system necessary to make long term in situ measurements of water properties. The main problem in obtaining the required accuracy (about 0.01 ppt for salinity) is the stability of conductivity measurements. The principal investigator has been working with moored conductivity measurements for the past 15 years and has used both electrode and inductive sensors. In the deep ocean, very small drifts have been observed over several months, but in shallow waters, drifts of as large as 0.1 ppt in salinity have occurred in a few months. Four tasks will be carried out: (1) conductivity sensor performance in various configurations and locations will be summarized, (ii) spatial and temporal aliasing errors will be investigated, (iii) sampling and digitizing accuracy will be estimated, and (iv) a power budget and memory size will be derived.