Extended Data Fig. 1: Response in the HIO3 concentration to varying the mixing fan speed.
From: The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source
A strong sensitivity of the HIO3 concentration to changes in the wall loss lifetime twall (dashed black line) is observed. While other parameters are held constant, stirring of the CLOUD atmospheric simulation chamber is reduced at 19:57 UTC, increasing the wall loss lifetime by a factor of four. HIO3 concentrations recover by a factor 12. The superlinear response is evidence for a reasonably long-lived precursor (that is, IO) that gets lost to the chamber walls. At 20:25 UTC, light is turned off, HIO3 production stops, and the HIO3 concentration is efficiently lost to the chamber walls. The model reproduces the observed behaviour if IO is considered to efficiently get lost to the chamber wall.
