1. South China Sea Institute of Planning and Environmental Research, State Oceanic Administration, Guangzhou 510300, China
2. Key Laboratory of Marine Resources and Coastal Engineering, School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China
3. Key Laboratory of Gemological Design and Testing, School of Jewelry and Art Design, Wuzhou University, Wuzhou 543002, China
4. School of Earth Sciences and Engineering, Sun Yat-sen University, Zhuhai 519082, China
5. Fourth Institute of Oceanography, Ministry of Natural Resources, Beihai 536000, China
6. South China Sea Marine Survey and Technology Center, State Oceanic Administration, Guangzhou 510300, China