The daily maximum soil-surface temperature is 40°C and the minimum is 15°C. Assuming that the diurnal temperature wave is symmetrical, that the mean temperature is equal throughout the profile (with the surface to the mean value at 6 A.M. and 6 P.M.), and that the “damping depth” is 15 cm, calculate the surface temperature at 8 A.M. What would be the temperature amplitude at a depth of 10 cm?
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