Long Wang¹, Benjamin Peter Horton^2,3, Nicole Khan⁴, Timothy Shaw³ and Tanghua Li², (1)East China Normal University, State key laboratory of estuarine and coastal research, Shanghai, China, (2)Nanyang Technological University, Earth Observatory of Singapore, Singapore, Singapore, (3)Nanyang Technological University, Asian School of the Environment, Singapore, Singapore, (4)University of Hong Kong, Department of Earth Sciences, Hong Kong, Hong Kong