The reduced winter vertical mixing in the subtropical oceans by the surface wave-induced mixing

Chen Siyu; Qiao Fangli; Huang Chuanjiang; Song Zhenya

doi:10.3969/j.issn.0253-4193.2020.05.003

Volume 42 Issue 5

Nov. 2020

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Chen Siyu，Qiao Fangli，Huang Chuanjiang, et al. The reduced winter vertical mixing in the subtropical oceans by the surface wave-induced mixing[J]. Haiyang Xuebao，2020, 42(5)：22–30，doi:10.3969/j.issn.0253−4193.2020.05.003

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The reduced winter vertical mixing in the subtropical oceans by the surface wave-induced mixing

doi: 10.3969/j.issn.0253-4193.2020.05.003

Chen Siyu^{1, 2
,},
Qiao Fangli^{2, 3, 4
,
,},
Huang Chuanjiang^{2, 3},
Song Zhenya^{2, 3}

1.
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
2.
First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
3.
Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
4.
Key Lab of Marine Environmental Science and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China

Received Date: 2019-04-08
Rev Recd Date: 2019-05-09

Available Online: 2020-11-18

Publish Date: 2020-05-25

Abstract

Abstract

The ocean mixing is one of the most important parameters in the global climate system. The simulation biases of the stratification and the ocean mixing are still open questions. Compared to observations, the simulated multi-model mean stratification during winter in the subtropical regions of both hemispheres shows week bias from 45 CMIP5 climate models. Our results from two numerical experiments using one of CMIP5 models, FIO-ESM v1.0, show that the non-breaking surface wave-induced vertical mixing can serve as a remedy. It increases the temperature of the upper ocean in winter which then stabilize the upper ocean and increase the stratification in subtropical regions. As a result, the stronger stratification restrains the ocean vertical mixing. The simulation of ocean mixing reduce from 227 cm/m² to 178 cm/m² in the north subtropical in winter, and from 189 cm/m² to 165 cm/m² in the south subtropical. They reduced by 21.6% and 12.7%, respectively. Further analysis indicated that the the surface wave-induced mixing strengthen the stratification by the increasing the upper ocean heat content and then improve the simulation of the ocean mixing.
- ocean mixing,
- surface wave-induced mixing,
- numerical model,
- winter,
- subtropical oceans

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References(39)

References

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