Submitted as: development and technical paper
25 Apr 2022
Submitted as: development and technical paper | 25 Apr 2022
Status: this preprint is currently under review for the journal GMD.

Improved ocean circulation modeling with combined effects of surface waves and M2 internal tides on vertical mixing: a case study for the Indian Ocean

Zhanpeng Zhuang1,2,3, Quanan Zheng4, Yongzeng Yang1,2,3, Zhenya Song1,2,3, Yeli Yuan1,2,3, Chaojie Zhou5, Xinhua Zhao6, Ting Zhang1, and Jing Xie7 Zhanpeng Zhuang 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
  • 4Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20740-20742, USA
  • 5Hainan Institute of Zhejiang University, Yazhou Bay Science and Technology City, Sanya 572025, China
  • 6Jiangsu Marine Resources Development Research Institute, Jiangsu Ocean University, Lianyungang 222005, China
  • 7School of Information and Control Engineering, Qingdao University of Technology, Qingdao 266520, China

Abstract. The surface waves and internal tides have great contribution to the vertical mixing processes in the upper ocean. In this study, three mixing schemes, including the non-breaking surface-wave-generated turbulent mixing, the mixing induced by the wave transport flux residue, and the internal-tide-generated turbulent mixing, are introduced to study the effects the surface waves and the internal tides on the vertical mixing. The three schemes are jointly incorporated into the Marine Science and Numerical Modeling (MASNUM) ocean circulation model as a part of the vertical diffusive terms, which are calculated by the surface wave parameters simulated from the MASNUM wave model and the surface amplitudes of the mode-1 M2 internal tides extracted from the satellite altimetry data using a two-dimensional plane wave fit method. The effects of the mixing schemes on the Indian Ocean modeling are tested by five climatological experiments. The surface waves and internal tides lead to enhance the vertical mixing processes in the sea surface and ocean interior, respectively. The combination of the mixing schemes is able to strengthen the vertical water exchange and draw more water from the sea surface to the ocean interior. The simulated results gain significant improvement in the thermal structure and the mixed layer depth if the three schemes are all adopted.

Zhanpeng Zhuang et al.

Status: open (until 20 Jun 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on gmd-2022-110', Anonymous Referee #1, 14 May 2022 reply

Zhanpeng Zhuang et al.

Data sets

Simulation data for the Indian Ocean in this study Zhanpeng Zhuang

Model code and software

MASNUM wave spectrum model Yongzeng Yang, Yeli Yuan, Zhanpeng Zhuang

MASNUM ocean circulation model Zhanpeng Zhuang, Yeli Yuan

Zhanpeng Zhuang et al.


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Short summary
We evaluate the impacts of surface waves and internal tides on the upper-ocean mixing in the Indian Ocean. The surface-wave-generated turbulent mixing is dominant if depth < 30 m, while the internal-tide-induced mixing is larger than surface wave in the ocean interior from 40 m to 130 m. The simulated thermal structure and mixed layer depths are both improved when the wave- and tide-induced mixing are jointly incorporated into the ocean model because of the strengythened vertical mixing.