Extended Data Fig. 2. Time and mass closure of hypothetical HIO₃ formation mechanisms.

Sensitivity studies assume hypothetical mechanisms that form HIO₃ from different precursors in the model. After the start of I₂ photolysis (Δt = 0), ΔHIO₃ is defined as HIO₃(Δt) - HIO₃(Δt = 0). HIO₃ measurements (thick black line, grey shading indicates 50 % uncertainty) and simulated time profiles assuming different hypothesised mechanisms in the model (coloured thin lines). The four panels a-d show the closure at different temperatures, and HIO₃ concentrations. The formation of HIO₃ via reactions R1 and R2 is the only mechanism compatible with observations regarding temporal and mass closure.

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