Corresponding Author

• sieh@ntu.edu.sg

Earth Observatory of Singapore, Nanyang Technological University, Singapore

Correspondence to: K. Sieh,

sieh@ntu.edu.sg

Earth Observatory of Singapore, Nanyang Technological University, Singapore

National University of Singapore, University Town, Singapore

Archaeology Unit, Institute of Southeast Asian Studies, Singapore

Earth Observatory of Singapore, Nanyang Technological University, Singapore

Institute of Marine and Coastal Science, Rutgers University, New Brunswick, NJ, USA

Institute of Earth, Ocean, and Atmospheric Sciences, Rutgers University, New Brunswick, New Jersey, USA

Earth Observatory of Singapore, Nanyang Technological University, Singapore

Earth Observatory of Singapore, Nanyang Technological University, Singapore

Institute of Marine and Coastal Science, Rutgers University, New Brunswick, NJ, USA

Institute of Earth, Ocean, and Atmospheric Sciences, Rutgers University, New Brunswick, New Jersey, USA

Earth Observatory of Singapore, Nanyang Technological University, Singapore

Department of Geosciences, National Taiwan University, Taipei, Taiwan

Department of Physics/Geophysics, Faculty of Mathematic and Natural Sciences, Syiah Kuala University, Banda Aceh, Indonesia

Centre for Environmental Geochemistry, British Geological Survey, Nottingham, UK

Asia Research Institute, National University of Singapore, Singapore