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ANALYTICAL SOIL–TEMPERATURE MODEL

CORRECTION FOR TEMPORAL VARIATION OF DAILY AMPLITUDE

^a Programa de Pós-graduação em Fisica do Ambiente Agricola, Departamento de Ciencias Exatas, Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ), Universidade de São Paulo (USP), Caixa Postal 9, 13418-900, Piracicaba, SP, Brazil
^b Departamento de Ciencias Exatas, Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ), Universidade de São Paulo (USP), Caixa Postal 9, 13418-900, Piracicaba, SP, Brazil
^c 394, Botanical Rd, Palmerston North-5301, New Zealand
^d Departmento de Matématic, IMECC, UNICAMP, Caixa Postal 6065, Campinas, SP 13081-970, Brazil

View larger version (15K): [in a new window]   Fig. 1. Temporal variation of daily amplitude of soil surface (a, b) and near-surface (c) temperature in three locations: (a) São Paulo, Brazil; (b) Sydney, Australia; and (c) Ribeirão Preto, Brazil. Dots refer to observed values; solid lines represent the adjusted sinusoidal equation, Eq. [11], fitted to observations, and dashed lines represent the mean value (Ad).

View larger version (16K): [in a new window]   Fig. 2. Soil temperature at day of year (DOY) 145 at four selected depths, for the usual model, Eq. [10], and for the model corrected for temporal variation of daily amplitude, Eq. [19], in São Paulo, Brazil. The daily average temperature, calculated with Eq. [8], is also shown.