Preprints
https://doi.org/10.5194/npg-2021-17
https://doi.org/10.5194/npg-2021-17

  20 Apr 2021

20 Apr 2021

Review status: this preprint has been withdrawn by the authors.

On the Generation and Evolution of Internal Solitary Waves in the Andaman Sea

Yujun Yu1, Jinhu Wang1, Shuya Wang1, Qun Li2, Xu Chen1, Jing Meng1, Kexiao Lu1, and Guixia Wang3 Yujun Yu et al.
  • 1Key Laboratory of Physical Oceanography, Ocean University of China and Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266100, China
  • 2Polar Research Institute of China (PRIC), Shanghai, 200000, China
  • 3College of Mathematical Science, Inner Mongolia Normal University, Hohhot, 010022, China

Abstract. Internal solitary waves (ISWs) are ubiquitous in the Andaman Sea, as revealed by synthetic aperture radar (SAR) images, but their generation mechanisms and corresponding influencing factors remain unknown. Based on a nonhydrostatic two-dimensional model, the generation of ISW packets along a transect of a channel lying between Batti Malv Island and Car Nicobar Island is investigated. Additionally, the influences of topographic characteristics, seasonal stratification variables and tidal forcings are analysed through a series of sensitivity runs. The simulated results indicate that bidirectional rank-ordered ISW packets are generated by the nonlinear steepening of internal tides. An east-west ISW asymmetry is observed, which is attributed to distinct topographic characteristics. The surrounding sills are also capable of generating internal wave beams, which modulate the intensity of ISWs. However, the topographic structure of the west flank of the ridge mainly contributes to the suppression of westward ISWs, which decrease the modulating effect of internal wave beams. During spring tide, the generation of ISWs is enhanced. Under neap tide, ISWs are weak, and the east-west ISW asymmetry is less obvious. Moreover, seasonally varied stratification only has a minor effect on the generation and evolution of ISWs.

This preprint has been withdrawn.

Yujun Yu et al.

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Interactive discussion

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Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Yujun Yu et al.

Yujun Yu et al.

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Short summary
According to synthetic aperture radar images, bidirectional rank-ordered internal solitary waves (ISWs) are visible in the channel lying between Car Nicobar Island and Batti Malv Island. In order to explore the generation and evolution of these ISWs, numerical simulations were performed. The generation mechanism and its variable factors were discussed. The asymmetrical feature of bidirectional of ISWs highlights the effect of topographic structure in simulation research of ISW.