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. Nitryl chloride (ClNO2), an important precursor of Cl atoms,significantly affects atmospheric oxidation capacity and O3 formation.However, sources of ClNO2 in inland China have not been fullyelucidated. In this work, laboratory experiments were conducted toinvestigate heterogeneous reactions of N2O5 with eight salinemineral dust samples collected from different regions in China, andsubstantial formation of ClNO2 was observed in these reactions.ClNO2 yields, φ(ClNO2), showed large variations (rangingfrom &lt;0.05 to ∼0.77) for different saline mineraldust samples, depending on mass fractions of particulate chloride. Inaddition, φ(ClNO2) could increase, decrease or showinsignificant change for different saline mineral dust samples when relativehumidity (RH) increased from 18 % to 75 %. We further found that currentparameterizations significantly overestimated φ(ClNO2) forheterogeneous uptake of N2O5 onto saline mineral dust. Inaddition, assuming a uniform φ(ClNO2) value of 0.10 forN2O5 uptake onto mineral dust, we used a 3-D chemical transportmodel to assess the impact of this reaction on tropospheric ClNO2 inChina and found that weekly mean nighttime maximum ClNO2 mixing ratioscould have been increased by up to 85 pptv during a severe dust event in May2017. Overall, our work showed that heterogeneous reaction of N2O5with saline mineral dust could be an important source of troposphericClNO2 in inland China.

atmospheric chemistry and physics

N&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;O&amp;lt;sub&amp;gt;5&amp;lt;/sub&amp;gt; uptake onto saline mineral dust: a potential missing source of tropospheric ClNO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; in inland China