Preprints
https://doi.org/10.5194/gmd-2021-441
https://doi.org/10.5194/gmd-2021-441

Submitted as: development and technical paper 13 Jan 2022

Submitted as: development and technical paper | 13 Jan 2022

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

Formulation of a new explicit tidal scheme in ocean general circulation model

Jiangbo Jin1,2, Run Guo1,3, Minghua Zhang4, Guangqing Zhou1, and Qingcun Zeng1 Jiangbo Jin et al.
  • 1International Center for Climate and Environment Sciences, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 2State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
  • 3College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
  • 4School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, New York, USA

Abstract. Tides play an important role in ocean energy transfer and mixing, and provide major energy for maintaining thermohaline circulation. This study proposes a new explicit tidal scheme and assesses its performance in a global ocean model. Instead of using empirical specifications of tidal amplitudes and frequencies, the new scheme directly uses the positions of the Moon and Sun in a global ocean model to incorporate tides. Compared with the traditional method that has specified tidal constituents, the new scheme can better simulate the diurnal and spatial characteristics of the tidal potential of spring and neap tides as well as the spatial patterns and magnitudes of major tidal constituents (K1 and M2). It significantly reduces the total errors of eight tidal constituents (with the exception of N2 and Q1) in the traditional explicit tidal scheme. Relative to the control simulation without tides, both the new and traditional tidal schemes can lead to better dynamic sea level (DSL) simulation in the North Atlantic, reducing significant negative biases in this region. The new tidal scheme also shows smaller positive bias than the traditional scheme in the Southern Ocean. The new scheme is suited to calculate regional distributions of sea level height in addition to tidal mixing.

Jiangbo Jin et al.

Status: open (until 10 Mar 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CEC1: 'Comment on gmd-2021-441', Juan Antonio Añel, 19 Jan 2022 reply
    • AC1: 'Reply on CEC1', Run Guo, 21 Jan 2022 reply
      • CEC2: 'Reply on AC1', Juan Antonio Añel, 23 Jan 2022 reply
        • AC2: 'Reply on CEC2', Run Guo, 24 Jan 2022 reply

Jiangbo Jin et al.

Jiangbo Jin et al.

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Short summary
In this paper, the inclusion of tides in a global model via the explicit calculation of the tide-generating force based on the positions of the Sun and Moon is proposed, rather than the traditional method of including about eight tidal constituents with empirical amplitudes and frequencies. The new scheme can better simulate the diurnal and spatial characteristics of the tidal potential of spring and neap tides as well as the spatial patterns and magnitudes of major tidal constituents.