Figure 6: Back trajectories by chemical regime.
From: A pervasive role for biomass burning in tropical high ozone/low water structures
10-day, HYSPLIT back trajectories for all CAST flights analysed here and CONTRAST RF03–05 and RF07–14 for observed pressures between 300 and 700 hPa. Trajectories are stopped when encountering convective precipitation and coloured by observed O3. Trajectories are separated by the CO regimes illustrated in Supplementary Fig. 2: (a) Polluted—low NO (CO >95 p.p.b.v. and NO <40 p.p.t.v.), (b) Polluted—high NO (CO >95 p.p.b.v. and NO >50 p.p.t.v.), and (c) Marine (CO <80 p.p.b.v. and NO <30 p.p.t.v.). The sum of January and February 2014 MODIS fire counts is shown in green.
