Characteristics of tidal gravity changes in Lhasa,Tibet,China
Characteristics of tidal gravity changes in Lhasa,Tibet,China作者机构：State Key Laboratory of Geodesy and Earth＇s Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077China
出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)
年 卷 期：2012年第57卷第22期
页 面：2586-2594页
核心收录：
基 金：supported by the National Natural Science Foundation of China(40874038 41074053 and 41021003)
主 题：超导重力仪 潮汐变化 拉萨 国际重力潮汐基准 青藏高原地区 重力潮汐观测 重力观测 中国
摘 要：Tidal gravity changes arise from the response of the solid Earth to the tidal forces of the Sun,Moon and planets close to the Earth,and are a comprehensive reflection of the structure and distribution of physical properties of the Earth s *** a result,observations of tidal gravity changes are the basis of studies on other global and/or regional dynamic *** characteristics of tidal gravity changes in the region of the Tibetan Plateau were investigated through continuous gravity measurements recorded with a superconducting gravimeter (SG) installed in Lhasa over a *** contrast measurements with a spring gravimeter LaCoste-Romberg ET20 at the same site,the gravity observations in Lhasa were scaled to the international tidal gravity reference in ***,the scale factor of the SG was determined accurately as-777.358 ± 0.136 nm s-2V-1,which is about 2.2% less than the value provided by the *** results indicate that the precision of the tidal gravity observations made with the SG in Lhasa was very *** standard deviation was 0.459 nm s-2,and the uncertainties of for the four main tidal waves (i.e.O 1,K 1,M 2 and S 2) were better than 0.006%.In addition,the observations of the diurnal gravity tides had an obvious pattern of nearly diurnal *** a result,it is affirmed that the Lhasa station can provide a local tidal gravity reference for gravity measurements on the Tibetan Plateau and its surrounding *** loading effects of oceanic tides on tidal gravity observations in Lhasa are so weak that the resulting perturbations in the gravimetric factors are less than 0.6%.However,the loading effects of the local atmosphere on either the tidal or nontidal gravity observations are significant,although no seasonal variations were *** removal of the atmospheric effects,the standard deviation of the SG observations in Lhasa decreased obviously from 2.009 to 0.459 nm *** removed the loading effects of ocea
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