The Computation Of Ocean Tidal Loading Effects In The Seas Adjacent To China And Over The Continent Of And Near China

The ocean tide loading effects in the seas adjacent to China and over the continent of and near China are computed in the present study. The TPXO7.0 is used as a global tide model, while the tidal data set developed by our group is used for the seas adjacent to China (105.5°E-141°E, 14°N-41°N). The loading tides are computed by using the load Green functions given by Farrell, which used Gutenberg-Bullen A Earth model. The elements of loading tides include the gravity, displacements, tilt, strain and self-attraction and loading (SAL). The obtained results are compared with those appeared in the published literatures, and a general consistency can be observed. Owing to the use of more accurate local tidal data, the results obtained in the present study should be more accurate than the existing ones. The result of the radial displacement loading tide shows that the amplitudes over the land are smaller than in the ocean, and reduces toward the inner part of the land. The maximum M₂ amplitude exceeding 28 mm appears east of Zhejiang coast; the second maximum exceeding 26 mm appears in the sea east of the Philippine Islands; and the third maximum exceeding 20 mm appears in the northern Bay of Bengal. In the South China Sea the M₂ amplitudes range from 2 to 10 mm. The amplitudes along the continental coast can reach 12 mm or so, and reduce toward the inner lands. The distribution pattern of the M₂ phases has a certain similarity to the ocean tide. A distinguished feature is that several amphidromic points also exist in the seas. The M₂ radial displacement loading tide has an amphidromic point in the western Qinghai province, around this point the occurrence time of peak value propagates clockwise. The maximum K₁ amplitude exceeding 17 mm appears in the southern South China Sea. In the Bohai, Yellow and East China Seas, the greater K1 amplitudes appear in the southeastern open ocean, and reduce toward the inner part of the seas. The minimum amplitudes appear in the Bohai Bay, the area near Dalian, and the Haizhou Bay. The K1 amplitude over the continent also reduces toward the inner lands. The K1 radial displacement loading tide does not have amphidromic point in the ocean, while it has an amphidromic point near the south boundary of Xizang, around which the occurrence time of peak value propagates clockwise. The distributions of the SAL and gravity loading tides are basically similar to that of the radial displacement loading tide. The maximum amplitude of the SAL appears east of the Philippine Islands, with a value exceeding 46 mm; the second maximum exceeding 42 mm appears east of the Zhejiang coast. The maximum amplitude of the gravity loading tide exceeding 9μGal appears east of the Zhejiang coast, and the second maximum amplitude exceeding 8μGal appears east of the Philippine Islands. The distributions of other elements are also described in the present dissertation.In this paper, the calculation of ocean loading tides and self-attraction loading tides in the seas adjacent to China is the first time, of while the radial displacement loading tide on the satellite altimeter data analysis and the self-attraction loading tides for the tidal dynamics simulation results both have application value.