Vertical motions of tide gauge stations near the Bohai Sea and Yellow Sea

• Published in: Science China. Earth sciences Vol. 58; no. 12; pp. 2279 - 2288
• Main Authors: Liu, ShouHua, Chen, ChangLin, Liu, KeXiu, Mu, Lin, Wang, Hui, Wu, XinRong, Zhang, JianLi, Duan, XiaoFeng, Gao, Jia
• Format: Journal Article
• Language: English
• Published: Beijing Science China Press 01.12.2015; Springer Nature B.V
• Subjects: Earth and Environmental Science; Earth Sciences; Gauges; Normal distribution; Oceanography; Research Paper; Tidal waves; 卫星高度计; 垂直运动速率; 海平面上升; 渤海; 运动速度; 马尔可夫模型; 验潮记录; 黄潮; Yellow Sea; Bohai Sea; vertical ground motion; Gauss Markov model; tide gauge station; altimeter; sea level
• ISSN: 1674-7313; 1869-1897
• DOI: 10.1007/s11430-015-5167-6

A modified Gauss-Markov model with weighted constraints was constructed by combining satellite altimeter and tide gauge records. Vertical motion rates of nine tide gauge stations around the Bohal Sea and Yellow Sea are estimated. This is the first time systematic estimates have been derived in this region. Downward trends were seen at the six tide gauge stations located at Tanggu, Longkou, Laohutan, Bayuquan, Xiaochangshan, and Yantai; with vertical motion rates of-1.82±0.50, -1.65±0.46, -0.88±0.42, -0.58±0.62, -0.13±0.43, and -0.01±0.43 mm/yr, respectively. Upward trends were seen at the three tide gauge stations located at Qinhuangdao, Huludao and Chengshantou; with vertical motion rates of 1.12±0.46, 0.55±0.49 and 0.26±0.44 mm/yr, respectively. There was significant subsidence in Tanggu and Longkou, and a rising trend in Qinhuangdao. According to our results, the rate of sea level rise calculated from these tide gauge records can be improved using a more accurate measurement of the land elevation accounting for lifting or subsidence. The model derived can be used to estimate vertical motions of tide gauge stations, and can be widely applied to revise the benchmark levels of tide gauges.