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              <p>&lt;div&gt;&lt;p&gt;In the context of climate change and increasing anthropogenic pressures in Africa, understanding the interactions between atmospheric chemistry, regional climate, and biogeochemical cycles is critical. This study investigates the potential role of biogenic nitric oxide emissions from African soils (BioNO), particularly in arid and semi-arid ecosystems, as major contributors to atmospheric nitrogen dioxide (NO 2 ) concentrations and regional atmospheric chemistry. To this end, we rely on a modelling approach based on the RegCM5 regional climate model, including an updated atmospheric chemistry module and, amongst other, a specific parametrization for BioNO emissions. Throughout the paper, the performances of the model are evaluated against various datasets, including in-situ observations from the INDAAF network and chemical reanalyses. Sensitivity studies demonstrate that integrating BioNO emissions into the model enhances the accuracy of simulated NO 2 , nitric acid (HNO 3 ), and ozone (O 3 ) seasonal cycles and surface concentrations, and reduces simulated biases compared to ground based observations. Despite these improvements, notable discrepancies still exist, in particular between simulated surface ozone concentrations and in-situ measurements. Similar biases are also observed in a chemical reanalysis model and in a state-of-the-art chemistry transport model used for comparison. In addition to highlighting the impact and added value of including BioNO fluxes in regional atmospheric chemistry models, our findings also highlight the suitability of the RegCM5 coupled system for studying regional climate, chemistry and nitrogen cycle interactions over Africa.&lt;/p&gt;&lt;/div&gt;</p>
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