Kristine L DeLong^1,2, Gilman Ouellette Jr¹, Xianfeng Wang³, Tsai-Luen Yu⁴ and Chuan-Chou Shen⁵, (1)Louisiana State University, Geography & Anthropology, Baton Rouge, LA, United States, (2)Coastal Studies Institute, Baton Rouge, LA, United States, (3)Nanyang Technological University, Earth Observatory of Singapore, Singapore, Singapore, (4)National Taiwan University, High-precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Department of Geoscience, Taipei, Taiwan, (5)National Taiwan University, High-Precision Mass Spectrometry and Environment Change Laboratory (HISPEC), Taipei, Taiwan