A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da FURG (RI FURG) |
Texto Completo: | http://repositorio.furg.br/handle/1/3355 |
Resumo: | Evapotranspiration (ET) plays an important role in global climate dynamics and in primary production of terrestrial ecosystems; it represents the mass and energy transfer from the land to atmosphere. Limitations to measuring ET at large scales using ground-based methods have motivated the development of satellite remote sensing techniques. The purpose of this work is to evaluate the accuracy of the SEBAL algorithm for estimating surface turbulent heat fluxes at regional scale, using 28 images from MODIS. SEBAL estimates are compared with eddy-covariance (EC) measurements and results from the hydrological model MGB-IPH. SEBAL instantaneous estimates of latent heat flux (LE) yielded r 2= 0.64 and r2 = 0.62 over sugarcane croplands and savannas when compared against in situ EC estimates. At the same sites, daily aggregated estimates of LE were r 2 = 0.76 and r2 = 0.66, respectively. Energy balance closure showed that turbulent fluxes over sugarcane croplands were underestimated by 7% and 9% over savannas. Average daily ET from SEBAL is in close agreement with estimates from the hydrological model for an overlay of 38,100 km2 (r2 = 0.88). Inputs to which the algorithm is most sensitive are vegetation index (NDVI),gradient of temperature (dT) to compute sensible heat flux (H) and net radiation (Rn). It was verified that SEBAL has a tendency to overestimate results both at local and regional scales probably because of low sensitivity to soil moisture and water stress. Nevertheless the results confirm the potential of the SEBAL algorithm, when used with MODIS images for estimating instantaneous LE and daily ET from large areas. |
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Ruhoff, Anderson LuisPaz, Adriano Rolim daCollischonn, WalterAragão, Luiz Eduardo Oliveira e Cruz deRocha, Humberto Ribeiro daMalhi, Yadvinder2013-05-02T18:53:45Z2013-05-02T18:53:45Z2012RUHOFF, Anderson Luis et al. A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas. Remote Sensing, v. 4, p. 703-725, 2012. Disponível em: <http://www.mdpi.com/2072-4292/4/3/703>. Acesso em: 02 mai. 2013.2072-4292http://repositorio.furg.br/handle/1/335510.3390/rs4030703Evapotranspiration (ET) plays an important role in global climate dynamics and in primary production of terrestrial ecosystems; it represents the mass and energy transfer from the land to atmosphere. Limitations to measuring ET at large scales using ground-based methods have motivated the development of satellite remote sensing techniques. The purpose of this work is to evaluate the accuracy of the SEBAL algorithm for estimating surface turbulent heat fluxes at regional scale, using 28 images from MODIS. SEBAL estimates are compared with eddy-covariance (EC) measurements and results from the hydrological model MGB-IPH. SEBAL instantaneous estimates of latent heat flux (LE) yielded r 2= 0.64 and r2 = 0.62 over sugarcane croplands and savannas when compared against in situ EC estimates. At the same sites, daily aggregated estimates of LE were r 2 = 0.76 and r2 = 0.66, respectively. Energy balance closure showed that turbulent fluxes over sugarcane croplands were underestimated by 7% and 9% over savannas. Average daily ET from SEBAL is in close agreement with estimates from the hydrological model for an overlay of 38,100 km2 (r2 = 0.88). Inputs to which the algorithm is most sensitive are vegetation index (NDVI),gradient of temperature (dT) to compute sensible heat flux (H) and net radiation (Rn). It was verified that SEBAL has a tendency to overestimate results both at local and regional scales probably because of low sensitivity to soil moisture and water stress. Nevertheless the results confirm the potential of the SEBAL algorithm, when used with MODIS images for estimating instantaneous LE and daily ET from large areas.engEvapotranspirationHydrological modellingMODISSEBALTropical biomesA MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannasinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da FURG (RI FURG)instname:Universidade Federal do Rio Grande (FURG)instacron:FURGORIGINALA MODIS-Based Energy Balance to Estimate.pdfA MODIS-Based Energy Balance to Estimate.pdfapplication/pdf1396632https://repositorio.furg.br/bitstream/1/3355/1/A%20MODIS-Based%20Energy%20Balance%20to%20Estimate.pdfd4e164d6d0f0008fc03064cc14a1bb0bMD51open accessLICENSElicense.txtlicense.txttext/plain; charset=utf-81724https://repositorio.furg.br/bitstream/1/3355/2/license.txt5b92b9704b4f13242d70e45ddef35a68MD52open access1/33552013-05-02 15:53:45.557open accessoai:repositorio.furg.br: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Repositório InstitucionalPUBhttps://repositorio.furg.br/oai/request || http://200.19.254.174/oai/requestopendoar:2013-05-02T18:53:45Repositório Institucional da FURG (RI FURG) - Universidade Federal do Rio Grande (FURG)false |
dc.title.pt_BR.fl_str_mv |
A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas |
title |
A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas |
spellingShingle |
A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas Ruhoff, Anderson Luis Evapotranspiration Hydrological modelling MODIS SEBAL Tropical biomes |
title_short |
A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas |
title_full |
A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas |
title_fullStr |
A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas |
title_full_unstemmed |
A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas |
title_sort |
A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas |
author |
Ruhoff, Anderson Luis |
author_facet |
Ruhoff, Anderson Luis Paz, Adriano Rolim da Collischonn, Walter Aragão, Luiz Eduardo Oliveira e Cruz de Rocha, Humberto Ribeiro da Malhi, Yadvinder |
author_role |
author |
author2 |
Paz, Adriano Rolim da Collischonn, Walter Aragão, Luiz Eduardo Oliveira e Cruz de Rocha, Humberto Ribeiro da Malhi, Yadvinder |
author2_role |
author author author author author |
dc.contributor.author.fl_str_mv |
Ruhoff, Anderson Luis Paz, Adriano Rolim da Collischonn, Walter Aragão, Luiz Eduardo Oliveira e Cruz de Rocha, Humberto Ribeiro da Malhi, Yadvinder |
dc.subject.por.fl_str_mv |
Evapotranspiration Hydrological modelling MODIS SEBAL Tropical biomes |
topic |
Evapotranspiration Hydrological modelling MODIS SEBAL Tropical biomes |
description |
Evapotranspiration (ET) plays an important role in global climate dynamics and in primary production of terrestrial ecosystems; it represents the mass and energy transfer from the land to atmosphere. Limitations to measuring ET at large scales using ground-based methods have motivated the development of satellite remote sensing techniques. The purpose of this work is to evaluate the accuracy of the SEBAL algorithm for estimating surface turbulent heat fluxes at regional scale, using 28 images from MODIS. SEBAL estimates are compared with eddy-covariance (EC) measurements and results from the hydrological model MGB-IPH. SEBAL instantaneous estimates of latent heat flux (LE) yielded r 2= 0.64 and r2 = 0.62 over sugarcane croplands and savannas when compared against in situ EC estimates. At the same sites, daily aggregated estimates of LE were r 2 = 0.76 and r2 = 0.66, respectively. Energy balance closure showed that turbulent fluxes over sugarcane croplands were underestimated by 7% and 9% over savannas. Average daily ET from SEBAL is in close agreement with estimates from the hydrological model for an overlay of 38,100 km2 (r2 = 0.88). Inputs to which the algorithm is most sensitive are vegetation index (NDVI),gradient of temperature (dT) to compute sensible heat flux (H) and net radiation (Rn). It was verified that SEBAL has a tendency to overestimate results both at local and regional scales probably because of low sensitivity to soil moisture and water stress. Nevertheless the results confirm the potential of the SEBAL algorithm, when used with MODIS images for estimating instantaneous LE and daily ET from large areas. |
publishDate |
2012 |
dc.date.issued.fl_str_mv |
2012 |
dc.date.accessioned.fl_str_mv |
2013-05-02T18:53:45Z |
dc.date.available.fl_str_mv |
2013-05-02T18:53:45Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
RUHOFF, Anderson Luis et al. A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas. Remote Sensing, v. 4, p. 703-725, 2012. Disponível em: <http://www.mdpi.com/2072-4292/4/3/703>. Acesso em: 02 mai. 2013. |
dc.identifier.uri.fl_str_mv |
http://repositorio.furg.br/handle/1/3355 |
dc.identifier.issn.none.fl_str_mv |
2072-4292 |
dc.identifier.doi.pt_BR.fl_str_mv |
10.3390/rs4030703 |
identifier_str_mv |
RUHOFF, Anderson Luis et al. A MODIS-based energy balance to estimate evapotranspiration for clear-sky days in Brazilian tropical Savannas. Remote Sensing, v. 4, p. 703-725, 2012. Disponível em: <http://www.mdpi.com/2072-4292/4/3/703>. Acesso em: 02 mai. 2013. 2072-4292 10.3390/rs4030703 |
url |
http://repositorio.furg.br/handle/1/3355 |
dc.language.iso.fl_str_mv |
eng |
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eng |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Repositório Institucional da FURG (RI FURG) |
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