1 School of Geography and Ocean Science, Nanjing University, Nanjing 210023, China.
2 State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
3 Collaborative Innovation Center of South China Sea Studies, Nanjing University, Nanjing 210093, China.
4 College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
5 Institute for Marine and Antarctic Studies-Hobart, University of Tasmania, Hobart, TAS 7004, Australia.