Climate Impact of Energetic Particle Precipitation in the Arctic Region

Energetic particle precipitation (EPP) is the most important solar-driven process missing from many chemistry-climate models today. We will study EPP, its impact on atmospheric chemistry and dynamics, and the connections to tropospheric climate. We will use the state-ofthe-art Whole Atmosphere Community Climate Model which we have designed for EPP studies, together with a novel combination of satellite-based and ground-based observations and advances mathematical methods. Our primary objective is to identify and verify the process chains related to the EPP-climate coupling. Our secondary objective is to assess the coupling in the context of advancing ozone recovery and global climate change, both of which are expected to enhance the EPP impact. Our results will assess the natural variability from solar-driven EPP, thus supporting the work of Intergovernmental Panel for Climate Change (IPCC). We will update the EPP solar forcing recommendation for climate simulations.