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Sensors 2016, 16(7), 956;

Use of MODIS Sensor Images Combined with Reanalysis Products to Retrieve Net Radiation in Amazonia

Remote Sensing Division, National Institute for Space Research, 1758 Astronautas Avenue, São José dos Campos, SP 12227-010, Brazil
Department of Geography and Atmospheric Science, University of Kansas, 1475 Jayhawk Boulevard, Lawrence, KS 66045, USA
Department of Soil, Water and Climate, University of Minnesota, 1991 Upper Bufford Circle, Saint Paul, MN 55108, USA
College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter EX4 4RJ, UK
Author to whom correspondence should be addressed.
Academic Editor: Barrett Rock
Received: 30 March 2016 / Revised: 17 May 2016 / Accepted: 13 June 2016 / Published: 24 June 2016
(This article belongs to the Section Remote Sensors)
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In the Amazon region, the estimation of radiation fluxes through remote sensing techniques is hindered by the lack of ground measurements required as input in the models, as well as the difficulty to obtain cloud-free images. Here, we assess an approach to estimate net radiation (Rn) and its components under all-sky conditions for the Amazon region through the Surface Energy Balance Algorithm for Land (SEBAL) model utilizing only remote sensing and reanalysis data. The study period comprised six years, between January 2001–December 2006, and images from MODIS sensor aboard the Terra satellite and GLDAS reanalysis products were utilized. The estimates were evaluated with flux tower measurements within the Large-Scale Biosphere-Atmosphere Experiment in Amazonia (LBA) project. Comparison between estimates obtained by the proposed method and observations from LBA towers showed errors between 12.5% and 16.4% and 11.3% and 15.9% for instantaneous and daily Rn, respectively. Our approach was adequate to minimize the problem related to strong cloudiness over the region and allowed to map consistently the spatial distribution of net radiation components in Amazonia. We conclude that the integration of reanalysis products and satellite data, eliminating the need for surface measurements as input model, was a useful proposition for the spatialization of the radiation fluxes in the Amazon region, which may serve as input information needed by algorithms that aim to determine evapotranspiration, the most important component of the Amazon hydrological balance. View Full-Text
Keywords: Amazon region; net radiation; MODIS sensor; GLDAS data; LBA project Amazon region; net radiation; MODIS sensor; GLDAS data; LBA project

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de Oliveira, G.; Brunsell, N.A.; Moraes, E.C.; Bertani, G.; dos Santos, T.V.; Shimabukuro, Y.E.; Aragão, L.E.O.C. Use of MODIS Sensor Images Combined with Reanalysis Products to Retrieve Net Radiation in Amazonia. Sensors 2016, 16, 956.

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