The study defines the thermodynamic trend component as HIST minus NAT and the dynamic component as the trend in NAT, where external forcing is fixed.

Evidence (1)

European summer drying largely driven by atmospheric circulation changes since the 1980s — Circulation-storyline design and validation of nudged simulations

we derive the thermodynamic component of the trend from the difference between the HIST and NAT simulations and the dynamic component from the NAT simulations

https://doi.org/10.1038/s41561-026-02050-w#unit-2-p4

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