Study on tidal gravity observations obtained at stations Zhongshan and Changcheng, Antarctic  

作　　者：徐建桥 郝兴华 孙和平 吕纯操 

出　　处：《地震学报》2001年第3期307-313,共7页Acta Seismologica Sinica

基　　金：State Natural Science Foundation of China (49925411 and 49774223) ;the Projects from Chinese Academy of Sciences (KZCX2-106 a

摘　　要：Based on the international tidal gravity reference values at station Wuhan, the tidal gravity parameters, including the amplitude factors and phase differences are determined accurately by using the observations with three LaCoste-Romberg (LCR) gravimeters (G-589, ET-20 and ET-21) at stations Zhongshan and Changcheng in the Antarctic, respectively. The standard deviations of the determined amplitude factors of the main tidal waves are better than 0.5%. The amplitude of each tidal wave observed at station Zhongshan is much less than that of the same wave at station Changcheng. The differences of amplitude factors in the diurnal band (O1) at these two stations are less than 7% while those in the semi-diurnal band (M2) are larger than 40%. The influences of meteorology factors, such as atmospheric pressure and temperature, on the tidal gravity observations are very obvious. The oceanic loading effects on the tidal gravity are also very prominent. It is found that the amplitude of the final residual vector of every tidal wave reduces significantly after oceanic correction based on the Schwiderski(s global co-tides. However, because the local oceanic loading is not taken into account, the discrepancies of amplitude factors of wave O1 observed at Zhongshan from the corresponding values of theoretical tidal model are about 4%, and 9% at Changcheng.Based on the international tidal gravity reference values at Wuhan station, the tidal gravity parameters, including the amplitude factors and phase differences are determined accurately by using the observations with three LaCoste Romberg (LCR) gravimeters (G 589, ET 20 and ET 21) at stations Zhongshan and Changcheng in the Antarctic, respectively. The standard deviations of the determined amplitude factors of the main tidal waves are better than 0.5%. The amplitude of each tidal wave observed at zhongshan station is much less than one of the same wave at Changcheng. The differences of amplitude factors in the diurnal band (O 1) at these two stations are less than 7% while those in the semi diurnal band (M 2) are larger than 40%. The influences of meteorology factors, such as atmospheric pressure and temperature, on the tidal gravity observations are very obvious. The oceanic loading effects on the tidal gravity are also very prominent. It is found that the amplitude of the final residual vector of every tidal wave reduces significantly after oceanic correction based on the Swiderski′s global co tides. However, because the local oceanic loading is not taken into account, the discrepancies of amplitude factors of wave O 1 observed at Zhongshan from the corresponding values of theoretical tidal model are about 4%, and 9% at Changcheng.

关 键 词：南极 中山站 长城站 重力潮汐观测 国际重力潮汐基准 理论潮汐模型 

分 类 号：P312.4[天文地球—固体地球物理学]