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Predicting bare soil temperature. II. Experimental testing of multi‐day models
Author(s) -
BUCHAN G. D.
Publication year - 1982
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1982.tb01759.x
Subject(s) - shortwave radiation , wind speed , spring (device) , environmental science , atmospheric sciences , air temperature , shortwave , sensitivity (control systems) , meteorology , radiation , soil science , physics , thermodynamics , optics , engineering , electronic engineering , radiative transfer
Summary Two agroclimatic models described earlier are tested against measurements of temperature at the soil surface, T 0 , 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 error<0.3 K to depth z =32 cm in spring and autumn. A sensitivity analysis of the output diurnal wave, T 0 ( t ), shows that maximum input economy requires only time‐dependent shortwave radiation, R s ( t ), and air temperature, T a ( 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 R s .