Data/hora: 09/06/2024 09:26:24

Provedor de dados: 	42	
País: 	Brazil	
Título: 	Modeling radiative transfer in tropical rainforest canopies: sensitivity of simulated albedo to canopy architectural and optical parameters	
Autores: 	Yanagi,Sílvia N. M.; Costa,Marcos H.	
Data: 	2011-12-01	
Ano: 	2011	
Palavras-chave: 	Amazonian Tropical Forest; Albedo; Radiative transfer; Modeling.	
Resumo: 	This study evaluates the sensitivity of the surface albedo simulated by the Integrated Biosphere Simulator (IBIS) to a set of Amazonian tropical rainforest canopy architectural and optical parameters. The parameters tested in this study are the orientation and reflectance of the leaves of upper and lower canopies in the visible (VIS) and near-infrared (NIR) spectral bands. The results are evaluated against albedo measurements taken above the K34 site at the INPA (Instituto Nacional de Pesquisas da Amazônia) Cuieiras Biological Reserve. The sensitivity analysis indicates a strong response to the upper canopy leaves orientation (x up) and to the reflectivity in the near-infrared spectral band (rNIR,up), a smaller sensitivity to the reflectivity in the visible spectral band (rVIS,up) and no sensitivity at all to the lower canopy parameters, which is consistent with the canopy structure. The combination of parameters that minimized the Root Mean Square Error and mean relative error are Xup = 0.86, rVIS,up = 0.062 and rNIR,up = 0.275. The parameterizations performed resulted in successful simulations of tropical rainforest albedo by IBIS, indicating its potential to simulate the canopy radiative transfer for narrow spectral bands and permitting close comparison with remote sensing products.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400010	
Editor: 	Academia Brasileira de Ciências	
Relação: 	10.1590/S0001-37652011000400010	
Formato: 	text/html	
Fonte: 	Anais da Academia Brasileira de Ciências  v.83 n.4 2011	
Fonte: 	info:eu-repo/semantics/openAccess