1. School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
2. School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, United Kingdom
3. National Centre for Earth Observation, University of Leicester, Leicester LE1 7RH, United Kingdom
4. Earth Observation Science, School of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, United Kingdom
5. Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, United States