Fig. 6: Metrics for dominant OA chemical regime differentiation.

Panels a and b present the cases of Sheep and Left Hand fires, respectively. Change in CO and WSOC as a function of flight time (i), O3-CH4 correlation (ii), O3:CO ratio as a function of flight time, and (iv) RH during the sapling for selected fire plumes of a sheep and b left hand Figures S16 and S17 present the metrics for the rest of the examined fire plumes. The correlation between O3 and CH4, along with the O3:CO ratio, provided notable indications of the dominant in-plume OA regime. All examined times are in the UTC time zone.