Predicting bare soil temperature. II. Experimental testing of multi‐day models

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Summary: Two agroclimatic models described earlier are tested against measurements of temperature at the soil surface, T0, and in bulk soil, T(z,t), at an experimental site near Aberdeen during spring, summer and autumn. Soil temperature is predicted most accurately in spring and autumn, when the constant‐windspeed model ENBL1 predicts the mean within 0.3 K of measurement. Thedynamic‐windspeed model ENBL2 predicts within 0.1 K in all intervals, and with errorz=32 cm in spring and autumn. A sensitivity analysis of the output diurnal wave, T0(t), shows that maximum input economy requires only time‐dependent shortwave radiation, Rs(t), and air temperature, Ta(t), other inputs being constant. Two or three harmonics in ENBL1 should suffice, requiring four or six measurements per day, depending mainly on the time‐structure of the primary driving function Rs.

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