Tanghua Li¹, Nicole Khan², Simon E Engelhart³, Matteo Vacchi⁴, W Richard Peltier⁵, Patrick P C Wu^2,6 and Benjamin Peter Horton^1,7, (1)Nanyang Technological University, Earth Observatory of Singapore, Singapore, Singapore, (2)University of Hong Kong, Department of Earth Sciences, Hong Kong, Hong Kong, (3)University of Rhode Island, Department of Geosciences, Narragansett, RI, United States, (4)CEREGE, Aix-en-Provence Cedex, France, (5)Univ Toronto, Toronto, ON, Canada, (6)University of Calgary, Department of Geoscience, Calgary, AB, Canada, (7)Nanyang Technological University, Asian School of the Environment, Singapore, Singapore