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

该项目涉及对水性质进行长期现场测量所需的传感器和记录系统。达到所需精度(盐度约为0.01ppt)的主要问题是电导率测量的稳定性。首席研究员在过去的15年里一直致力于系泊电导率的测量，并同时使用了电极和电感传感器。在深海，在几个月内观察到非常小的漂移，但在浅水，盐度高达0.1ppt的漂移在几个月内发生。将执行四项任务：(1)总结不同配置和位置的电导传感器的性能，(Ii)调查空间和时间混叠误差，(Iii)估计采样和数字化精度，以及(Iv)得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.