System Ⅱ型海洋重力仪静态观测结果与分析

根据青岛海洋地质研究所新购置System II型海洋重力仪的静态观测实验,分析了重力数据的变化情况,检测到该仪器单日记录数值较为稳定,但伴随有小于±0.1mGal左右的震荡。同时分析了该设备对固体潮的反映,静态观测重力值所展现的变化特征和周期性与固体潮相一致。鉴于其能明显反应固体潮对静态观测重力值的影响,可认为其静态观测精度优于0.2mGal。并测定了重力仪月漂值小于国家标准3mGal/月。同时比较讨论了与KSS31M型重力仪在中科院海洋研究所的静态观测数据的区别与联系。

Static Measurement Result of Micro-g Lacoste Air and Sea System II Marine Gravimeter and Its Analysis

To evaluate the performance of the newly acquired System II marine gravimeter, a fixed point static measurement was conducted in the gravity lab of Qingdao Institute of Marine Geology （QIMG）. Under the specific research and analysis of the performance of the instrument, several kinds of gravity changes were detected. The raw gravity data is generally stable with tiny oscillation（ small than＋0, lmGal） in a single day. Also, the solid earth tide could be clearly detected in this static measurement from the data collected, and it showed the periodic swing of the raw gravity record. Accordingly, the accuracy of the gravimeter was excellent and could sufficiently detect the tiny variation of gravity. The gravity drift rate was less than 3reGal per month under measurement. In addition, we discussed the similarities and differences with the static measurement data of KSS31M in IOCAS （Institute of Oceanology China Academy of Science）.