KSS31M型海洋重力仪在动_静态条件下观测到的读数变化及分析.pdfVIP

1 9 2 Vol. 19 No. 2 2004 6 (442~ 448) PROGRESS IN GEOPHYSICS June 2004 KSS31M 栾锡武 ( , 266071) 2002 年中国科学院海洋研究所从德国引进了KSS31M 型海洋重力仪. 为对该重力仪的工作性能有详细的了 ,分别在德国重力仪生产厂实验室中国科学院海洋研究所重力仪实验室进行了静态的定点观测, 将重力仪安装在 考察船上在黄埔江渔政码头等地进行了动态条件下的定点观测. 动静态的定点观测发现了多种规律性的重力仪读 数变化,分析认为这些规律性的读数变化分别是重力仪的随机振荡月潮的重力效应海潮的重力效应和重力仪的线 性漂移. 它们各自有着不同的变化规律, 并在海洋重力观测时总是同时存在. 重力仪的随机振荡是重力仪自身固有 的, 其振荡幅度随外界条件的变化而变化, 一般为0.04 mGal~ 0.5 mGal, 周期为2~ 5 min 不等. 在德国的重力仪厂家 实验室和中国科学院海洋研究所重力实验室中观测到了月潮引起的重力变化, 其变化幅度为 0. 2 mGal. 月潮引起的 重力变化和海潮引起的重力变化同步,但相位相反. 本文指出, 仪器的月漂往往很难精确判定, 本文用多种方法计算 得到的仪器月漂在 1. 2 mGal 到2. 3 mGal 之间. KSS31M 海洋重力仪, 随机振荡, 月潮重力效应, 海潮重力效应, 月漂 P738 A 1004-2903(2004)02-0442-07 The fixed points gravity data measurment used by KSS31M and data analysis LUAN Xi- u ( I nst it ute of Oceanology , Chi nese A cademy of Sciences ( I OCA S ) , Q i ng dao 266071, Chi na) Abstract To evaluate the performance of the ne ly developed KSS31M marine gravity meter, fixed points gravity data measurement as conducted in gravity lab of the German Gravity Meter Company and gravity lab of IOCAS and also on the research vessel at harbor of Huangpu River. Several kinds of gravity changes ere recorded during the measurement, they are namely instrument random oscillation, moon tide gravity change and sea tide gravity change and drift. Each of the kinds of the gravity change has its o n regulation but exits at the same time during the marine gravity measurement. The instru- ment random oscillation is an intrinsic property of th