Xiaoqing Liu^1,2, Lihua Dong², Mengfan Chu², Mingzhi Liu², Xin Xiao², Hongyan Bao³, Guangjin Zheng², Dongyong Li², Lei Xing², Haoshuai Li², Zhiyou Jing⁴, Jihai Dong⁵, Jifan Shi⁶, Li Xu⁷, Zuosheng Yang², Thorsten Dittmar⁸ and Rui Bao², (1)University of Oldenburg, Oldenburg, Germany, (2)Ocean University of China, Qingdao, China, (3)Xiamen University, Xiamen, China, (4)South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China, (5)NUIST Nanjing University of Information Science and Technology, Marine Sciences, Nanjing, China, (6)Fudan University, Shanghai, China, (7)Woods Hole Oceanographic Institution, Woods Hole, United States, (8)University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM), Oldenburg, Germany