1. School of Energy and Environment, City University of Hong Kong, Tat Chee Avenue, Hong Kong, China
2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China
3. Earth System Science Programme, Faculty of Science, The Chinese University of Hong Kong, Hong Kong China
4. Department of Civil and Environmental Engineering, National University of Singapore, Singapore
5. The Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong, China