南极中山站重力潮汐观测的海潮负荷效应  

Loading Effects of the Ocean Tides on the Tidal Gravity Observations at Zhongshan Station in the Antarctic

作　　者：徐建桥[1] 孙和平 周江存[1] 

机构地区：[1]中国科学院测量与地球物理研究所,湖北武汉430077

出　　处：《测绘学报》2002年第3期228-233,共6页Acta Geodaetica et Cartographica Sinica

基　　金：中国科学院资助项目 (KZCX2 10 6;KZ95 1 A1 2 0 5 0 2 ) ;国家自然科学基金资助项目 (4 992 5 411)

摘　　要：综合分析了LaCoste Romberg (LCR)ET2 1高精度弹簧重力仪 1 998年 1 2月 2 6日至 2 0 0 0年 1月 9日在南极中山站的重力潮汐观测资料 ,采用目前普遍使用的Schwiderski、Csr 3.0和Fes96.2全球海潮模型研究中山站重力潮汐观测的海潮负荷改正问题。结果表明在南极地区 ,目前的海潮模型存在较大的不确定性 ,还不足以精密确定该区域的海潮负荷改正。经海潮改正后 ,重力潮汐观测结果与潮汐理论值之间还存在比较大的差异 ,观测的周日 (O1 )和半日(M2 )潮波重力振幅因子与相应的理论值之间的平均偏差分别为 3.8%和 7.8%。南极地区附近海域海冰的变化将导致该地区海潮负荷响应非常明显的季节性系统变化。The tidal gravity observations, recorded with a high precision LaCoste Romberg (LCR) gravimeter ET21 from December 26, 1998 to January 9, 2000 at Zhongshan station in the Antarctic, are comprehensively analyzed. Several commonly adopted global ocean co tidal models, such as Schwiderski, Csr3.0 and Fes96.2, are employed to investigate the loading correction of ocean tides to the tidal gravity observations at Zhongshan station. The final results indicate that all the present ocean co tidal models are too uncertain to determine accurately the oceanic correction in the Antarctic region. After oceanic correction, there still exists very large discrepancy between the tidal gravity observations and the corresponding theoretical values of Earth's tides. The average discrepancy between the observed and the corresponding theoretical amplitude factors of the tidal gravity is about 3.8% in the diurnal tidal band, and about 7.8% in the semi diurnal band. Seasonal variation of the huge sea ice, which covers over the sea nearby the Antarctic continent, may be responsible for the obviously seasonal variation of the oceanic loading response in this area.

关 键 词：负荷效应 南极 中山站 重力潮汐观测资料 海潮模型 潮汐理论值 

分 类 号：P223.39[天文地球—大地测量学与测量工程]