The cruise observation of turbulent mixing in the upwelling region east of Hainan Island in the summer of 2012

LI Mingming; XIE Lingling; ZONG Xiaolong; ZHANG Shuwen; ZHOU Lei; LI Junyi

doi:10.1007/s13131-018-1260-y

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Article Navigation > Acta Oceanologica Sinica > 2018 > 37(9): 1-12

LI Mingming, XIE Lingling, ZONG Xiaolong, ZHANG Shuwen, ZHOU Lei, LI Junyi. The cruise observation of turbulent mixing in the upwelling region east of Hainan Island in the summer of 2012[J]. Acta Oceanologica Sinica, 2018, 37(9): 1-12. doi: 10.1007/s13131-018-1260-y

Citation:

LI Mingming, XIE Lingling, ZONG Xiaolong, ZHANG Shuwen, ZHOU Lei, LI Junyi. The cruise observation of turbulent mixing in the upwelling region east of Hainan Island in the summer of 2012[J]. Acta Oceanologica Sinica, 2018, 37(9): 1-12. doi: 10.1007/s13131-018-1260-y

Citation:

LI Mingming, XIE Lingling, ZONG Xiaolong, ZHANG Shuwen, ZHOU Lei, LI Junyi. The cruise observation of turbulent mixing in the upwelling region east of Hainan Island in the summer of 2012[J]. Acta Oceanologica Sinica, 2018, 37(9): 1-12. doi: 10.1007/s13131-018-1260-y

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The cruise observation of turbulent mixing in the upwelling region east of Hainan Island in the summer of 2012

doi: 10.1007/s13131-018-1260-y

1.
Guangdong Key Laboratory of Coastal Ocean Variability and Disaster Prediction, Guangdong Ocean University, Zhanjiang 524088, China
2.
Physical Oceanography Laboratory, Ocean University of China, Qingdao 266003, China
3.
Institute of Oceanography, Shanghai Jiaotong University, Shanghai 200240, China;Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266200, China

Received Date: 2017-12-25

Abstract

Abstract

The turbulent mixing in the upwelling region east of Hainan Island in the South China Sea is analyzed based on in situ microstructure observations made in July 2012. During the observation, strong upwelling appears in the coastal waters, which are 3℃ cooler than the offshore waters and have a salinity 1.0 greater than that of the offshore waters. The magnitude of the dissipation rate of turbulent kinetic energy ε in the upwelling region is O (10^-9 W/kg), which is comparable to the general oceanic dissipation. The inferred eddy diffusivity K_ρ is O (10^-6 m²/s), which is one order of magnitude lower than that in the open ocean. The values are elevated to K_ρ≈O (10^-4 m²/s) near the boundaries. Weak mixing in the upwelling region is consistent with weak instability as a result of moderate shears versus strong stratifications by the joint influence of surface heating and upwelling of cold water. The validity of two fine-scale structure mixing parameterization models are tested by comparison with the observed dissipation rates. The results indicate that the model developed by MacKinnon and Gregg in 2003 provides relatively better estimates with magnitudes close to the observations. Mixing parameterization models need to be further improved in the coastal upwelling region.
- coastal upwelling,
- mixing,
- turbulent kinetic energy dissipation rate,
- eddy diffusivity,
- South China Sea

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