1. Earth System Science Programme, Faculty of Science, The Chinese University of Hong Kong, Hong Kong, China
2. Department of Chemistry, The Chinese University of Hong Kong, Hong Kong, China
3. The University Research Facility in Life Sciences, The Hong Kong Polytechnic University, Hong Kong, China
4. Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, USA
5. Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong, China
6. Department of Chemical Pathology, The Chinese University of Hong Kong, Hong Kong, China
7. The Institute of Environment, Energy and Sustainability, The Chinese University of Hong Kong, Hong Kong, China