Estimation of soil heat flux in a neotropical Wetland region using remote sensing techniques

Revista Brasileira de Meteorologia - Tập 29 Số 4 - Trang 469-482 - 2014
Victor Hugo de Morais Danelichen1, Marcelo Sacardi Bíudes1, Maísa Caldas Souza1, Nadja Gomes Machado2, Bernardo Barbosa da Silva3, José de Souza Nogueira1
1Universidade Federal de Mato Grosso (UFMT), Brazil
2Universidade Federal de Mato Grosso (UFMT), Brazil; Instituto Federal de Mato Grosso, Brazil
3Universidade Federal de Pernambuco, UFPE, Brazil

Tóm tắt

The direct estimation of the soil heat flux (G) by remote sensing data is not possible. For this, several models have been proposed empirically from the relation of G measures and biophysical parameters of various types of coverage or not vegetated in different places on earth. Thus, the objective of this study was to evaluate the relation between G/Rn ratio and biophysical variables obtained by satellite sensors and evaluate the parameterization of different models to estimate G spatially in three sites with different soil cover types. The net radiation (Rn) and G were measured directly in two pastures at Miranda Farm and Experimental Farm and and Monodominant Forest of Cambará. Rn, G, and G/Rn ratio and MODIS products, such as albedo (α), surface temperature (LST), vegetation index (NDVI) and leaf area index (LAI) varied seasonally at all sites and inter-sites. The sites were different from each other by presenting different relation between measures of Rn, G and G/Rn ratio and biophysical parameters. Among the original models, the model proposed by Bastiaanssen (1995) showed the best performance with r = 0.76, d = 0.95, MAE = 5.70 W m-2 and RMSE = 33.68 W m-2. As the reparameterized models, correlation coefficients had no significant change, but the coefficient Willmott (d) increased and the MAE and RMSE had a small decrease.

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Revista Brasileira de Meteorologia

Tập 29 Số 4

469-482

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