[1] Univ Cambridge, Dept Chem, Cambridge CB2 1EW, England
[2] Univ Lancaster, Lancaster Environm Ctr, Lancaster LA1 4YQ, England
[3] Univ Edinburgh, Sch Geosci, Edinburgh EH9 3JW, Midlothian, Scotland
[4] Univ Leicester, Dept Phys & Astron, Leicester LE1 7RH, Leics, England
[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[6] Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester M13 3PL, Lancs, England
[7] Ctr Ecol & Hydrol, Penicuik EH26 0QB, Midlothian, Scotland
[8] Univ York, Dept Chem, York YO10 5DD, N Yorkshire, England
[9] Met Off, Exeter, Devon, England
[10] Univ Edinburgh, Dept Chem, Edinburgh EH8 9YL, Midlothian, Scotland
[11] Univ Malaya, Inst Ocean & Earth Sci, Kuala Lumpur 50603, Malaysia
[12] Univ Malaya, Dept Chem, Kuala Lumpur 50603, Malaysia
[13] Univ E Anglia, Sch Environm Sci, Norwich NR4 7TJ, Norfolk, England
[14] Global Satria Life Sci Lab, Tawau 91000, Sabah, Malaysia
[15] Ketua Stesen GAW Lembah Danum, Malaysian Meteorol Dept, Tawau 91011, Sabah, Malaysia
[16] Univ Malaysia Sabah, Sch Sci & Technol, Kota Kinabalu, Malaysia
[17] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA
[18] NOAA, Earth Syst Res Lab, Boulder, CO USA