1. Department of Physics and AstronomyUniversity of Leicester Leicester UK
2. National Centre for Earth ObservationUniversity of Leicester Leicester UK
3. Leicester Institute for Space and Earth ObservationUniversity of Leicester Leicester UK
4. Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of Leeds Leeds UK
5. National Centre for Earth ObservationUniversity of Leeds Leeds UK
6. Lancaster Environment CentreLancaster University Lancaster UK
7. Department of ChemistryUniversity of Waterloo Waterloo Ontario Canada
8. National Centre for Atmospheric ScienceUniversity of Leeds Leeds UK
9. Department of Chemistry and BiochemistryOld Dominion University Norfolk VA USA