Preprints
https://doi.org/10.5194/npg-2021-31
https://doi.org/10.5194/npg-2021-31

  07 Sep 2021

07 Sep 2021

Review status: this preprint is currently under review for the journal NPG.

Regional study of mode-2 internal solitary waves in the Pacific coast of Central America using marine seismic survey data

Wenhao Fan, Haibin Song, Yi Gong, Shun Yang, and Kun Zhang Wenhao Fan et al.
  • State Key laboratory of Marine Geology, School of Ocean and Earth Science, Tongji University, Shanghai, 200092, China

Abstract. In this paper, a regional study of the mode-2 internal solitary waves (ISWs) in the Pacific coast of Central America is carried out by using seismic reflection method. The observed relationship between the dimensionless phase velocity and the dimensionless amplitude (DA) of the mode-2 ISWs was analysed. When DA < 1, the dimensionless phase velocity increases with the increasing dimensionless amplitude, divided into two parts with different growth rates. When DA > 1, the dimensionless phase velocity increases with the increasing dimensionless amplitude at a relatively small growth rate. We suggest that the influences of seawater depth (submarine topography), pycnocline depth, and pycnocline thickness on the phase velocity of the mode-2 ISWs in the study area, cause the relationship between the dimensionless phase velocity and the dimensionless amplitude diversified. The observed relationship between the dimensionless wavelength and the dimensionless amplitude of the mode-2 ISWs was also analysed. When DA < 1 and DA > 2, the dimensionless wavelength decreases and increases with the increasing dimensionless amplitude, respectively. Additionally, the seawater depth has a great influence on the wavelength of the mode-2 ISWs in the study area, and overall the wavelength increases with the increasing seawater depth. As for the vertical structure of the amplitude of the mode-2 ISWs in the study area, we find that it is affected by the nonlinearity of the ISWs and the pycnocline deviation (especially the downward pycnocline deviation).

Wenhao Fan et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on npg-2021-31', Anonymous Referee #1, 17 Sep 2021
  • RC2: 'Comment on npg-2021-31', Anonymous Referee #2, 20 Oct 2021

Wenhao Fan et al.

Wenhao Fan et al.

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Short summary
A large number of mode-2 ISWs have been imaged using seismic reflection method. It is found that the relationships between propagation velocity and amplitude, as well as wavelength and amplitude of the mode-2 ISWs in the study area are diverse and affected by factors such as seawater depth, pycnocline depth, and pycnocline thickness. The vertical structure of the mode-2 ISWs’ amplitude in the study area is affected by the ISWs nonlinearity and the shift of the pycnocline center.