Cite this paper:
CHEN Siyu, QIAO Fangli, HUANG Chuanjiang, SONG Zhenya. Contribution of surface wave-induced vertical mixing to heat content in global upper ocean[J]. HaiyangYuHuZhao, 2020, 38(2): 307-313

Contribution of surface wave-induced vertical mixing to heat content in global upper ocean

CHEN Siyu1,2,3, QIAO Fangli2,3,4, HUANG Chuanjiang2,3,4, SONG Zhenya2,3,4
1 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, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;
4 Key Laboratory of Marine Sciences and Numerical Modeling, Ministry of Natural Resources, Qingdao 266061, China
Abstract:
Compared with observations, the simulated upper ocean heat content (OHC) determined from climate models shows an underestimation bias. The simulation bias of the average annual water temperature in the upper 300 m is 0.2℃ lower than the observational results. The results from our two numerical experiments, using a CMIP5 model, show that the non-breaking surface wave-induced vertical mixing can reduce this bias. The enhanced vertical mixing increases the OHC in the global upper ocean (65°S-65°N). Using non-breaking surface wave-induced vertical mixing reduced the disparity by 30% to 0.14℃. The heat content increase is not directly induced by air-sea heat fluxes during the simulation period, but is the legacy of temperature increases in the first 150 years. During this period, additional vertical mixing was initially included in the climate model. The non-breaking surface wave-induced vertical mixing improves the OHC by increasing the air-sea heat fluxes in the first 150 years. This increase in air-sea heat fluxes warms the upper ocean by 0.05-0.06℃. The results show that the incorporation of vertical mixing induced by nonbreaking surface waves in our experiments can improve the simulation of OHC in the global upper ocean.
Key words:    surface wave-induced|vertical mixing|upper ocean heat content|air-sea heat fluxes|climate model   
Received: 2019-01-16   Revised: 2019-04-15
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