1 Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Ocean University of China, Qingdao, 266100, P.R. China.
2 Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, P.R. China.
3 Key Laboratory of Marine Environment & Ecology, Ministry of Education, Qingdao, 266100, P.R. China.
4 Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao, Shandong, 266061, China.
5 Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC, 27695, USA.
6 The Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao, 266071, P.R. China.
7 Physical Oceanography Laboratory/CIMST, Ocean University of China, Qingdao, 266100, P.R. China.
8 Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266061, P.R. China. tianjw@ouc.edu.cn.
9 Physical Oceanography Laboratory/CIMST, Ocean University of China, Qingdao, 266100, P.R. China. tianjw@ouc.edu.cn.