苏禄—苏拉威西海内孤立波动力参数时空变化特征

doi:10.11978/2021183

Abstract

Abstract:

On the basis of the weakly nonlinear theory of internal solitary waves (ISWs) and the reanalyzed assimilation data in the Sulu-Celebes Sea in both summer and winter, we calculate the dynamic parameters of the ISWs, including the linear wave speed, the first- and second-order nonlinear parameters and the linear dispersion parameter, and investigate the spatial-temporal variations of these parameters. We find that, although the intrusion from the north Pacific Ocean into the Celebes Sea is very obvious, the spatial-temporal variations of the dynamic parameters of the ISWs in the Sulu Sea is more significant than that in the Celebes Sea. In the Sulu sea, the linear speed of ISW in summer is ~0.1 m·s^-1 larger than that in winter; however, in the Celebes Sea, the linear speed of ISW in summer is ~0.05 m·s^-1 smaller than that in winter. Regardless of the first- and second-order nonlinear parameters, their variations in the Celebes Sea are relatively weak, but in the Sulu Sea, their variations are significant. In the Sulu Sea, the first-order nonlinear parameter in summer is ~3×10^-3 s^-1 higher than that in winter, but the second-order nonlinear parameter in summer is ~3×10^-5 m^-1·s^-1 lower than that in winter. In addition, in both the Sulu and Celebes Sea, the linear dispersion parameter in summer tends to reduce, but the reduction magnitude in Sulu Sea is relatively large. This paper shows that the variation in the depth of the maximum buoyancy frequency in the Sulu-Celebes Sea is the dominant factor that in turn results in the associated spatial-temporal variations of the dynamic parameters of ISWs.

Key words: Sulu-Celebes Sea, internal solitary waves, dynamic parameters, spatial-temporal variations, maximum buoyancy frequency

CLC Number:

P731.24

XIE Jieshuo, GONG Yankun, NIU Jianwei, HE Yinghui, CHEN Zhiwu, XU Jiexin, CAI Shuqu. Spatial-temporal variations of the dynamic parameters of internal solitary waves in the Sulu-Celebes Sea[J].Journal of Tropical Oceanography, 2022, 41(6): 132-142.

Figures/Tables 9

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Spatial-temporal variations of the dynamic parameters of internal solitary waves in the Sulu-Celebes Sea

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