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. To mitigate the human impact on climate change, it is essential to determine thecontribution of emissions to the concentration of trace gases. In particular,the source attribution of short-lived species such as OH and HO2 isimportant as they play a crucial role for atmospheric chemistry. This studypresents an advanced version of a tagging method for OH and HO2 ( HOx ) which attributes HOx concentrations to emissions.While the former version (V1.0) only considered 12 reactions in thetroposphere, the new version (V1.1), presented here, takes 19 reactions in thetroposphere into account. For the first time, the main chemicalreactions for the HOx chemistry in the stratosphere are also regarded(in total 27 reactions). To fully take into account the main HO2 source by the reaction of H and O2 , the tagging of the H radical isintroduced. In order to ensure the steady-state assumption, we introduce restterms which balance the deviation of HOx production and loss. Thiscloses the budget between the sum of all contributions and the totalconcentration. The contributions to OH and HO2 obtained by theadvanced tagging method V1.1 deviate from V1.0 in certain source categories.For OH, major changes are found in the categories biomass burning, biogenicemissions and methane decomposition. For HO2 , the contributionsdiffer strongly in the categories biogenic emissions and methanedecomposition. As HOx reacts with ozone ( O3 ), carbonmonoxide (CO), reactive nitrogen compounds ( NOy ), non-methanehydrocarbons (NMHCs) and peroxyacyl nitrates (PAN), the contributions to thesespecies are also modified by the advanced HOx tagging method V1.1.The contributions to NOy , NMHC and PAN show only little change,whereas O3 from biogenic emissions and methane decompositionincreases in the tropical troposphere. Variations for CO from biogenicemissions and biomass burning are only found in the Southern Hemisphere.

geoscientific model development

An advanced method of contributing emissions to short-lived chemical species (OH and HO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;): the TAGGING 1.1 submodel based on the Modular Earth Submodel System (MESSy 2.53)