Figure S1. Sensitivity of heat fluxes and relevance scores over a range of saturation for CH-Fru and US-Whs. We illustrate this by selecting the timestep where the relevance from air temperature to latent and sensible heats was largest, since it is a large driving factor in both heat fluxes. We then varied the soil moisture content near the surface from the wilting point to saturation, while keeping all other inputs constant, and computed latent heat, sensible heat, and the corresponding relevances for surface moisture (figure 5). Over the full range of soil moisture conditions, both CH-Fru and US-Whs show negative correlations between the fluxes and soil moisture relevance scores.