Effects of near-inertial internal wave breaking mixing scheme on the MOM4 model

Wu Fanghua; Fan Zhisong; Chu Hetao

doi:10.3969/j.issn.0253-4193.2019.03.001

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Wu Fanghua, Fan Zhisong, Chu Hetao. Effects of near-inertial internal wave breaking mixing scheme on the MOM4 model[J]. Haiyang Xuebao, 2019, 41(3): 1-11. doi: 10.3969/j.issn.0253-4193.2019.03.001

Citation:

Wu Fanghua, Fan Zhisong, Chu Hetao. Effects of near-inertial internal wave breaking mixing scheme on the MOM4 model[J]. Haiyang Xuebao, 2019, 41(3): 1-11. doi: 10.3969/j.issn.0253-4193.2019.03.001

Wu Fanghua, Fan Zhisong, Chu Hetao. Effects of near-inertial internal wave breaking mixing scheme on the MOM4 model[J]. Haiyang Xuebao, 2019, 41(3): 1-11. doi: 10.3969/j.issn.0253-4193.2019.03.001

Citation:

Wu Fanghua, Fan Zhisong, Chu Hetao. Effects of near-inertial internal wave breaking mixing scheme on the MOM4 model[J]. Haiyang Xuebao, 2019, 41(3): 1-11. doi: 10.3969/j.issn.0253-4193.2019.03.001

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Effects of near-inertial internal wave breaking mixing scheme on the MOM4 model

doi: 10.3969/j.issn.0253-4193.2019.03.001

1.
National Climate Center, Beijing 100081, China;Laboratory for Climate Studies, China Meteorological Administration, Beijing 100081, China
2.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
3.
Laixi Meteorological Bureau, Laixi 266600, China

Received Date: 2018-01-08
Rev Recd Date: 2018-04-07

Abstract

Abstract

Diapycnal mixing due to wind-generated near-inertial internal wave breaking plays an important role in the ocean interior mixing. However, the effects of its parameterization on the simulation in oceanic model remain to be studied progressively. In this paper, a diapycnal mixing parameterization due to wind-generated near-inertial wave breaking is implemented to the Modular Ocean Model (MOM) below the ocean surface boundary layer. Simulation results show that the proposed scheme can effectively improve the upper 1 000 m temperature and salinity deviations simulated by MOM4, especially in the ventilation areas of the North Pacific Ocean and the North Atlantic Ocean. Numerical experiments show that the near-inertial wave breaking may be one of the most important mechanisms to maintain the oceanic ventilation processes. It makes temperature colder, salinity fresher and isopyncal layer depth deeper in the ventilation area. The maintenance of ventilation processes extends the impact of the subpolar gyre to the subtropical gyre in the North Pacific. Therefore, the simulated temperature and salinity in the source region of the North Pacific Intermediate Water and the eastern part of the subtropical gyre are closer to the observation. Meanwhile, the simulation of the North Atlantic Ocean overturning circulation intensity is more reasonable.
- diapycnal mixing,
- near-inertial internal wave breaking,
- North Pacific Intermediate Water,
- Atlantic meridional overturning circulation

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