Simulation of global M2 barotropic tide based on POM
The Princeton ocean model(POM)is a widely-used regional numerical model,but its applicability to numerical simulation of global tide has not been verified.In this study,the tripolar grid and tidal potential was introduced into POM to simulate the global ocean tide including the North Pole and established a numerical model of global tide with a horizontal resolution of 1° × 1° to simulate the global M2 barotropic tide.The model results showed that there are 5 amphidromic points of M2 tidal component in the Pacific Ocean,4 in the Atlantic Ocean,3 in the Indian Ocean,and 2 in the Arctic Ocean.The amplitude of the M2 tidal component is generally smaller than that of the nearshore.There are two high amplitude regions of the M2 tidal component in the equatorial Pacific Ocean and the amplitude of the Arctic Ocean is the smallest in comparison with the other three oceans.The results are highly consistent with that from the TPXO7.2 global ocean tidal assimilation model,with a root mean square error of the tidal amplitude of 5.6 cm,a root mean square deviation of the phase of 10.0°,and a mean relative error of amplitude of 12.5％.The simulated results of POM were then compared with the global tidal constants(GTCs)data set and the results show an root mean square error of 21.4 cm for amplitude,29.1° for phase,and a mean relative error of 25.1％for amplitude.This suggests that the proposed model based on POM can accurately simulate and obtain the distribution characteristics of the global ocean tide,thus providing a reference for the application of POM into other research on global ocean dynamic processes.
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