Pan-Atlantic compound extremes between North America and Europe in a nested regional climate model setup

Teleconnections and the dynamics of extreme event co-occurrence across continents are relevant for understanding compounding risks and improving early warning systems. Pan-Atlantic compound extremes between climate extremes in North America and Europe have been receiving increasing attention lately, also due to the occurrence of recent events e.g., the February 2020 cold wave in North America that co-occurred with warm anomalies over Europe and wet and windy extremes in the UK, or the summer 2016 heat wave over Europe that was linked to upstream high-amplitude Rossby-wave packets originating from North America several days before the event. Previous studies furthermore suggest that wet extremes in Europe (e. g., 2021 floods in Germany) could be linked to particularly persistent atmospheric circulation and blocking patterns associated with upstream Rossby wave breaking over North America and the Atlantic.While recent research increasingly recognizes co-occurring extreme events over North America and Europe as interconnected phenomena—often mediated by Rossby wave breaking and atmospheric blocking—studies explicitly linking specific North American extremes (e.g., cold spells) to simultaneous European extremes (e.g., heavy precipitation) remain limited. This is particularly true when moving beyond individual historical cases to systematically analyze pan-Atlantic compound extremes using reanalysis data and climate model simulations. A key challenge lies in achieving high-resolution climate simulations that can accurately capture precipitation-related extremes, while also encompassing the broad spatial scale required to represent large-scale pan-Atlantic circulation patterns.To address these gaps, we take advantage of a large ensemble of high-resolution climate simulations over a North American and a European domain, which are nested in the atmospheric, westerly flow of a global earth system model. This dataset provides us a large data base of regional extremes in high-resolution of 0.11° while allowing us to study large-scale teleconnections of extreme events at both sides of the Atlantic. The regional nested climate simulations consist of 50 members of the Canadian Earth System Model version 2 (CanESM-2) as well as four members of the Max Planck Earth System Model (MPI-ESM), both dynamically downscaled with the Canadian Regional Climate Model version 5 (CRCM5) over the North-American and European CORDEX domain.Here, we present our research concept and preliminary results from analyzing pan-Atlantic compound extremes in reanalysis data, a reanalysis-driven CRCM5 simulation, and our ensemble of nested regional climate model simulations. This research aims to advance our understanding of the processes underlying co-occurring extreme events across the North Atlantic by identifying and investigating specific compound events in high resolution.

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