The Characteristics of Gravity and Regional Ocean Tides at Zhongshan Station in Antarctic

• Main Authors: LIU Qingchao, SUN Heping, WANG Zemin, CHEN Xiaodong, ZHANG Shengkai, XU Jianqiao
• Format: Article in Journal/Newspaper
• Language: Chinese
• Published: Surveying and Mapping Press 2018
• Subjects: Antarctic; tidal gravity; regional and global ocean tide model; Mathematical geography. Cartography; GA1-1776; Zhongshan; Zhongshan Station; Antarc*
• Online Access: https://doi.org/10.11947/j.AGCS.2018.20170123; https://doaj.org/article/970388c9d6464f4199148dbe9e09e0eb

This study investigates the characteristics of gravity and ocean tides using time series recorded with the spring gravimeter and tide gauge at Zhongshan station, CATS2008 regional ocean tide model, and Eot11a global ocean tide model. The results show that the ocean tidal amplitude of O1 wave reaches 28 cm in the diurnal tidal bands. The sum of four tidals (Q1, O1, P1 and K1) difference between the global model and the tide gauge station is 4.2 cm, and that between the regional model and the tide gauge station is 4.4 cm. In contrast, the tidal amplitude of M2 wave reaches 20 cm in the semi-diurnal bands, and the sum of four tidals (N2, M2, S2 and K2) difference are 7.7 cm and 5.1 cm, respectively. This shows that correcting global ocean tide model using regional models is important. Subsequent to the correction of global oceanic loading using the regional model, the amplitudes of final residuals for the main gravity waves K1, M2, and S2 decreased by 9.84%, 56.14%, and 37.08%, respectively, which indicates that the regional ocean tide model can better reflect the true characteristics of ocean tides. Moreover, the validity of correcting global ocean tide model using the regional model is verified.