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Time Constants for Thermal Equilibration of Leaf, Canopy, and Soil Surfaces with Change in Insolation 1
Author(s) -
Wiegand C. L.,
Swanson W. A.
Publication year - 1973
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1973.00021962006500050014x
Subject(s) - canopy , insolation , environmental science , shading , atmospheric sciences , radiation , thermal , plant canopy , agronomy , hydrology (agriculture) , soil science , meteorology , botany , geology , optics , biology , climatology , physics , art , geotechnical engineering , visual arts
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.