文献类型：期刊文献

中文题名：The cruise observation of turbulent mixing in the upwelling region east of Hainan Island in the summer of 2012

英文题名：The cruise observation of turbulent mixing in the upwelling region east of Hainan Island in the summer of 2012

作者：Li Mingming[1];Xie Lingling[1];Zong Xiaolong[2];Zhang Shuwen[1];Zhou Lei[3,4];Li Junyi[1]

机构：[1]Guangdong Ocean Univ, Guangdong Key Lab Coastal Ocean Variabil & Disast, Zhanjiang 524088, Peoples R China;[2]Ocean Univ China, Phys Oceanog Lab, Qingdao 266003, Peoples R China;[3]Shanghai Jiao Tong Univ, Inst Oceanog, Shanghai 200240, Peoples R China;[4]Pilot Natl Lab Marine Sci & Technol Qingdao, Lab Reg Oceanog & Numer Modeling, Qingdao 266200, Peoples R China

年份：2018

卷号：37

期号：9

起止页码：1

中文期刊名：Acta Oceanologica Sinica

外文期刊名：ACTA OCEANOLOGICA SINICA

收录：SCI-EXPANDED(收录号：WOS:000445730400001)、CSTPCD、、Scopus(收录号：2-s2.0-85053822401)、WOS、CSCD2017_2018、CSCD

基金：The National Natural Science Foundation of China under contract Nos 41476009, 41776034 and 41476010; the Natural Science Foundation of Guangdong Province of China under contract No. 2016A030312004; the Global Air-Sea Interaction Project of State Oceanic Administration under contract No. GASI-IPOVAI-01-02; the Laboratory of Tropical Ocean Open Foundation under contract No. LT1404.

语种：英文

中文关键词：coastal upwelling mixing turbulent kinetic energy;dissipation rate;eddy diffusivity;South China Sea

外文关键词：coastal upwelling; mixing; turbulent kinetic energy dissipation rate; eddy diffusivity; South China Sea

中文摘要：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 Kρ is O（10–6 m2/s）, which is one order of magnitude lower than that in the open ocean. The values are elevated to Kρ≈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 Mac Kinnon 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.

外文摘要：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 degrees C 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 epsilon in the upwelling region is O (10(-9) W/kg), which is comparable to the general oceanic dissipation. The inferred eddy diffusivity K is O (10(-6) m(2)/s), which is one order of magnitude lower than that in the open ocean. The values are elevated to K approximate to O (10(-4) m(2)/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.