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Remote Sens. 2015, 7(11), 14597-14619; doi:10.3390/rs71114597

Use of MODIS Images to Quantify the Radiation and Energy Balances in the Brazilian Pantanal

1
Embrapa Satellite Monitoring, Campinas, 13070-115 SP, Brazil
2
Embrapa Pantanal, Corumbá, 79320-900 MS, Brazil
*
Author to whom correspondence should be addressed.
Academic Editors: Richard Müller and Prasad S. Thenkabail
Received: 28 August 2015 / Revised: 21 October 2015 / Accepted: 29 October 2015 / Published: 4 November 2015
(This article belongs to the Special Issue Remote Sensing of Solar Surface Radiation)
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Abstract

MODIS images during the year 2012 were used for modelling of the radiation and energy balance components with the application of the SAFER algorithm (Simple Algorithm for Evapotranspiration Retrieving) in the Brazilian Pantanal area. Pixels from the main sub-regions of Barão de Melgaço (BR), Paiaguás (PA) and Nhecolândia (NH) were extracted in order to process microclimatic comparisons. In general, the net radiation (Rn) relied much more on the global solar radiation (RG) levels than on water conditions and ecosystem types, in accordance with the low Rn standard deviation values. The fraction of the available energy used as latent heat flux (λE) were, on average, 65, 50 and 49% for the BR, PA and NH sub-regions, respectively. Horizontal heat advection, identified by the negative values of sensible heat flux (H), made several pixels with λE values higher than those for Rn in the middle of the year. Taking the evaporative fraction (Ef) as a surface moisture indicator, the Tree-Lined Savanna (TLS) was considered the moister ecosystem class, with 58% of the available energy being used as λE, while the driest one was the modified ecosystem Anthropogenic Changes (AC), presenting a λE/Rn fraction of 0.46. According to the spatial and temporal consistencies, and after comparisons with other previous point and large-scale studies, the SAFER algorithm proved to have sensibility to quantify and compare the large-scale radiation and energy balance components in the different ecosystems of the Brazilian Pantanal. The algorithm is useful for monitoring the energy exchange dynamics among the different terrestrial and aquatic ecosystem types throughout the seasons of the year. View Full-Text
Keywords: remote sensing; net radiation; latent heat flux; sensible heat flux; evaporative fraction; wetlands remote sensing; net radiation; latent heat flux; sensible heat flux; evaporative fraction; wetlands
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Teixeira, A.H.C.; Padovani, C.R.; Andrade, R.G.; Leivas, J.F.; Victoria, D.C.; Galdino, S. Use of MODIS Images to Quantify the Radiation and Energy Balances in the Brazilian Pantanal. Remote Sens. 2015, 7, 14597-14619.

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