Fig. 1. Temporal variation of daily amplitude of soil surface (a, b) and near-surface (c) temperature in three locations: (a) São Paulo, Brazil; (b) Sydney, Australia; and (c) Ribeirão Preto, Brazil. Dots refer to observed values; solid lines represent the adjusted sinusoidal equation, Eq. [11], fitted to observations, and dashed lines represent the mean value (Ad).