基于SCHISM模式的全球潮波模拟

基于非结构网格半隐式跨尺度海洋模式(semi-implicit cross-scale hydroscience integrated system model,SCHISM),作者采用非结构三角网格,对全球大洋潮波进行数值模拟.通过调和分析,将196个潮位站的实测数据与模拟结果进行比较验证,两者符合良好,M2、K1分...

Global tide simulation based on the semi-implicit cross-scale hydroscience integrated system model

Based on the SCHISM (semi-implicit cross-scale hydroscience integrated system model), an unstructured triangular grid is used to numerically simulate global ocean tides. Through harmonic analysis, the measured data of 196 tidal stations are compared with simulated results to verify that the two are in good agreement. The shape of the cotidal global M₂ and K₁chart components were found to be similar to those given by the TPXO8, FES2014b, and NAO99.b models. According to the simulated results, the cotidal charts of the four main components of M₂, S₂, K₁, and O₁ are given. The results show that there are eight M₂ amphidromic points in the Pacific Ocean, four M₂ amphidromic points in the Atlantic Ocean, and 3 M₂ amphidromic points in the Indian Ocean. Generally speaking, the amplitudes of the M₂ tidal component in the waters near the eastern border of the North Pacific and North Atlantic oceans are always greater than that of the waters near the western border, whereas the opposite is true in the South Pacific and South Atlantic oceans. The distribution characteristics of the S₂ tidal component are similar to that of the M₂ tidal component, although the amplitude is smaller. There are five K₁ amphidromic points in the Pacific Ocean, three K₁ amphidromic points in the Atlantic Ocean, and two K₁ amphidromic points in the Indian Ocean. The amplitude of the K₁ tidal component is generally small, not exceeding 30 cm in most sea areas, in the waters near the North Pacific and Antarctica with an increasing trend from an ocean to a nearshore. There are four amphidromic points of O₁ in the Pacific Ocean and two amphidromic points in the Atlantic and Indian Oceans. The amplitude of the O₁ tidal component does not exceed 20 cm in most sea areas, and in the waters near the North Pacific and Antarctica there is an increasing trend from an ocean to a nearshore. Finally, the reasons for the errors between the proposed model and the comparison model are discussed.