Numerical simulation of nitrous oxide over Asia using regional climate-chemistry-ecology coupling model RegCM-Chem-YIBs

Abstract. Nitrous oxide (N₂O) is a significant greenhouse gas that not only contributes to global warming but also depletes the ozone layer. In our study, we enhanced a regional climate-chemistry-ecology model to better understand how N₂O is emitted, transported, and dispersed in the atmosphere. We focused on East Asia, South Asia, and Southeast Asia, using two different datasets to analyze the patterns of N₂O in 2020. Our model showed good agreement with real-world observations, revealing that N₂O levels vary seasonally and spatially. For example, the lowest concentrations were found in June, while the highest were in December. Certain areas, like the North China Plain and the Ganges River Basin, had higher N₂O levels. We also found that N₂O concentrations decrease with altitude. By validating our model, we gained insights into the complex interactions between N₂O emissions and atmospheric processes. This research helps policymakers develop strategies to reduce N₂O emissions. In the future, we aim to refine our model further to improve predictions of N₂O emissions and distribution, which will support efforts to combat climate change and protect the ozone layer.