Wenhui CUI, University of Macau, Department of Ocean Science and Technology, Faculty of Science and Technology, Macau, China, Zhiqin Jiang, South China Sea Institute of Oceanology, Chinese Academy of Sciences, State Key Laboratory of Tropical Oceanography, Guangzhou, China and Jie Xu, University of Macau, Ocean Science and Technology and Centre for Regional Oceans, Macau, China