Highlights re Coupled high‐resolution land‐atmosphere modeling for hydroclimate and terrestrial hydrology in Alaska and the Yukon River basin (1990–2021)

• Overall, this study established a high-resolution, optimized model configuration for the Regional Arctic System Model (RASM) for Alaska and the Yukon River Basin.
• We generated a high‐fidelity 4 km climate data set (1990–2021) for Alaska and Yukon and evaluated it against multiple observational data sets.
• This is one of very few studies striving to maintain a decent performance for streamflow simulations in regional climate models. Iterative testing was implemented to improve both hydroclimate and terrestrial hydrology simulations in coupled land‐atmosphere models
• We used transfer entropy to investigate the discrepancy in connectivity of hydrologic and energy fluxes between the offline CTSM and coupled models, which contributed to their discrepancy in streamflow simulations.
• This is also the first study that coupled the Community Terrestrial Systems Model (CTSM) into RASM.

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