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The impact of a recently proposed HNO3-forming channel of the HO2+ NO reaction on atmospheric ozone, methane and their precursors isassessed with the aim to investigate its effects on aviation NOxinduced radiative forcing. The first part of the study addresses the differences in stratospheric andtropospheric HOx-NOx chemistry in general, by comparing a globalclimate simulation without the above reaction to two simulations withdifferent rate coefficient parameterizations for HO2 + NO →HNO3. A possible enhancement of the reaction by humidity, asfound by a laboratory study, particularly reduces the oxidation capacity ofthe atmosphere, increasing methane lifetime significantly. Since methanelifetime is an important parameter for determining global methane budgets,this might affect estimates of the anthropogenic greenhouse effect. In the second part aviation NOx effects are isolated independently foreach of the three above simulations. Warming and cooling effects of aircraftNOx emissions are both enhanced when considering the HNO3-formingchannel, but the sum is shifted towards negative radiative forcing.Uncertainties associated with the inclusion of the HO2 + NO →HNO3 reaction and with its corresponding rate coefficient propagate aconsiderable additional uncertainty on estimates of the climate impact ofaviation and on NOx-related mitigation strategies

atmospheric chemistry and physics

Global sensitivity of aviation NO&amp;lt;sub&amp;gt;x&amp;lt;/sub&amp;gt; effects to the HNO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;-forming channel of the HO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; + NO reaction