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HO2 is an important atmospheric trace gas, whose sink to aerosol ispoorly understood yet significant. Previous parameterisations of the rate ofuptake have been limited by the lack of laboratory studies.This paper creates a parameterisation for γHO2based on the available laboratory studies. The calculated global meanγHO2 is 0.028, significantly lower than previous work (0.2).Modelled concentrations of HO2 show significant regional sensitivityto the value of γHO2 (up to +106% at the surface withthe parameterisationof γHO2 in this work as compared with a value of 0.2),but global sensitivity is small (+3.2%). The modelled response inO3 is also highly regional, being up to +27% at the surface overChina, and only+0.3% globally (with the parameterisation of γHO2 inthis work as compared with a value of 0.2). The impact ofγHO2 on sulfate is more complex, with up to +16% overChina and −5% over high latitudes, resulting in a global change of +1.2%(with the parameterisation of γHO2 inthis work as compared with a value of 0.2). Uncertainty in the reactionmechanism and hence products (previously assumed to be H2O2)impacts the processing of sulfur and hence aerosol loads. Further laboratorystudies are desirable to constrain the rate of reaction and to elucidatethe reaction mechanism and products

Parameterisation and impact of aerosol uptake of HO&lt;sub&gt;2&lt;/sub&gt; on a global tropospheric model

Parameterisation and impact of aerosol uptake of HO<sub>2</sub> on a global tropospheric model