CG型重力仪用于海潮负荷观测的可行性  

Feasibility of CG Gravimeters for Ocean Tide Loading Observation

作　　者：王笋 杨锦玲 林鸿杰 党学会[3] 叶友权 WANG Sun;YANG Jinling;LIN Hongjie;DANG Xuehui;YE Youquan(Marine Earthquake Observation Center of Fujian Province,669 Shengguang Road,Xiamen 361021,China;Fujian Seismic Station,7 Huahong Road,Fuzhou 350003,China;The First Monitoring and Application Center,CEA,7 Naihuo Road,Tianjin 300180,China)

机构地区：[1]福建省海洋地震观测中心,厦门市盛光路669号,361021 [2]福建省地震台,福州市华鸿路7号,350003 [3]中国地震局第一监测中心,天津市耐火路7号,300180

出　　处：《大地测量与地球动力学》2023年第12期1253-1255,1274,共4页Journal of Geodesy and Geodynamics

基　　金：福建省地震局科技基金(SF202104);国家自然科学基金(42104091)。

摘　　要：为验证便携式相对重力仪用于短时重力潮汐观测的可行性,在厦门地震台进行同址对比测试。以利用gPhone重力仪的长观测时段数据修正的FES2004海潮模型为参考,分离出gPhone、CG-5和CG-6型重力仪的静态观测残差序列。结果表明,CG-5和CG-6型重力仪在1 CPD(circle per day)和2 CPD附近的噪声水平(非线性漂移)与gPhone重力仪接近,对主要的全日分潮和半日分潮分析影响较小,观测精度能满足短时海潮模型修正的需要。以CG-5型重力仪在平潭岛的短时重力潮汐数据修正FES2014海潮模型得到测站海潮模型,并回测35 d前绝对重力观测时段的重力海潮负荷值。改正后组均值残差标准差从FES2014模型的2.7μGal降至1.8μGal,由此验证了CG型便携式相对重力仪用于海潮负荷观测的可行性。To verify the feasibility of using portable relative gravimeters for short-term gravity tidal observations to improve the ocean tidal model,we conduct a same-site comparison at the Xiamen seismic station.Using the stational ocean tidal model corrected from FES2004 with long term gPhone data as the reference,we separate the static observation residual sequences of gPhone,CG-5 and CG-6 gravimeters.The spectrums show that the noise level(non-linear drift)of CG-5 and CG-6 at 1 CPD(circle per day)and 2 CPD are slightly higher than that of the gPhone.This indicates that the impact on the semi-diurnal and full-diurnal tides analysis is small,and the observation accuracy can meet the needs of short-time tide model correction.We built the stational tide model at Pingtan island,which is corrected from FES2014 with the data recorded by a CG-5 gravimeter.The gravity tidal load during the absolute gravity observation period 35 d ago is remeasured.In contrast with the FES2014 model,the standard deviation of group mean residual after ocean tidal correction with our stational model is reduced from 2.7μGal to 1.8μGal.The feasibility of CG portable relative gravimeter for tidal load observation is verified.

关 键 词：重力海潮负荷 CG型重力仪 重力潮汐观测 

分 类 号：P223[天文地球—大地测量学与测量工程]