Time Constants for Thermal Equilibration of Leaf, Canopy, and Soil Surfaces with Change in Insolation1

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Abstract
Experiments were conducted to determine the time constant for thermal equilibration of a cotton (Gossypium hirsutum L.) plant leaf, the plant canopy, and a soil surface with a change in incident solar radiation (insolation). The time course of surface temperatures sensed by portable radiation thermometers during periods of full sun and artificial shading were the data obtained. The plant leaf and the canopy equilibrated in 40 seconds to 1 minute, but the soil required more than 10 minutes. These results have important implications in interpreting airborne thermal scanner data obtained under partly cloudy sky conditions.

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