Preprints
https://doi.org/10.5194/gmd-2022-254
https://doi.org/10.5194/gmd-2022-254
Submitted as: model evaluation paper
24 Oct 2022
Submitted as: model evaluation paper | 24 Oct 2022
Status: this preprint is currently under review for the journal GMD.

Development and validation of a global 1/32° surface wave-tide-circulation coupled ocean model: FIO-COM32

Bin Xiao1,2,3, Fangli Qiao1,2,3, Qi Shu1,2,3, Xunqiang Yin1,2,3, Guansuo Wang1,2,3, and Shihong Wang1,2,3 Bin Xiao et al.
  • 1First Institute of Oceanography, and Key Laboratory of Marine Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China
  • 2Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China
  • 3Shandong Key Laboratory of Marine Science and Numerical Modeling, Qingdao 266061, China

Abstract. Model resolution and the included physical processes are two of the most important factors that determine the realism of ocean model simulations. In this study, a new global surface wave-tide-circulation coupled ocean model FIO-COM32 with a resolution of 1/32°×1/32° is developed and validated. Promotion of the horizontal resolution from 1/10° to 1/32° leads to significant improvements in the simulations of surface eddy kinetic energy (EKE), main paths of the Kuroshio and Gulf Stream, and the global tides. We propose the Integrated Circulation Route Error (ICRE) as a quantitative criteria to evaluate the simulated main paths of Kuroshio and Gulf Stream. The non-breaking surface wave-induced mixing (Bv) is proven to still be an important contributor that improves the agreement of the simulated summer mixed layer depth (MLD) and the Argo observations even with a high horizontal resolution of 1/32°. The mean error of the simulated mid-latitude summer MLD is reduced from -4.8 m in the numerical experiment without Bv to -0.6 m in experiment with Bv. By including the global tide, the global distributions of internal tide can be explicitly simulated in this new model and are comparable to the satellite observations. Based on Jason3 along-track sea surface height (SSH), wave number spectral slopes of mesoscale ranges and wave number-frequency analysis show that the unbalanced motions induced SSH undulation is a key factor for the substantially improved agreement between model and satellite observations in the low latitudes and low EKE regions. For ocean model community, surface waves, tidal currents and ocean circulations have been separated into different streams for more than half a century. This paper suggests that it should be the time to merge these three streams for new generation ocean model development.

Bin Xiao et al.

Status: open (until 11 Jan 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on gmd-2022-254', Paul PUKITE, 26 Oct 2022 reply
  • RC1: 'Comment on gmd-2022-254', Anonymous Referee #1, 01 Dec 2022 reply

Bin Xiao et al.

Bin Xiao et al.

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Short summary
A new global surface wave-tide-circulation coupled ocean model FIO-COM32 with resolution of 1/32° × 1/32° is developed and validated. Both the promotion of the horizontal resolution and included physical processes are proved to be important contributors to the significant improvements of FIO-COM32 simulations. It should be the time to merge these separated model components (surface wave, tidal current and ocean circulation) for new generation ocean model development.