Fang Cao¹, Ding He², Chen He³, Shi Quan³, Yuntao WANG⁴ and Yan Bai⁴, (1)East China Normal University, State Key Laboratory of Estuarine and Coastal Research, Shanghai, China, (2)School of Earth Sciences, Zhejiang University, Hangzhou, China, (3)China University of Petroleum, State Key Laboratory of Heavy Oil Processing, Beijing, China, (4)Second Institute of Oceanography State Oceanic Administration, Hangzhou, China