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Energy Balance with Landsat 8 Satellite Images in Irrigated Areas of Juazeiro Municipality

DOI: http://dx.doi.org/10.12702/iii.inovagri.2015-a010

 

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Antônio H. de C. Teixeira1, Janice F. Leivas1, Ricardo G. Andrade1 & Fernando B. T. Hernandez2

 

Abstract: Landsat 8 satellite images were used with the SAFER (Simple Algorithm For Evapotranspiration Retrieving) algorithm for the energy balance quantification in irrigated crops inside the Juazeiro municipality, Northeast Brazil, involving different thermohydrological conditions of the years 2013 and 2014. Two images represented the wet conditions soon after the rainy period (May-June), while the other ones were inside the driest period (September-October).  The average values for the global solar radiation (RG) ranged from 19.6 ± 0.5 to 26.2 ± 0.2 MJ m-2 day-1 while for the net radiation (Rn) this range was from 8.2 ± 0.2 to 11.9 ± 0.3 MJ m-2 day-1. The mean latent λE and sensible H heat fluxes were, respectively, from 7.5 ± 3.3 to 10.5 ± 2.3 and -2.1 ± 2.3 to 4.0 ± 3.3 MJ m-2 day-1. Soil heat fluxes (G) under all irrigation conditions were around 0.4 ± 0.1 MJ m-2 dia-1. Shortly after the rainfall season, the fractions of Rn used as λE were 112 and 119% for respectively 2013 and 2014. The corresponding values for the driest period were 0.63 and 0.98. The negative H and higher λE than Rn which happened in large areas soon after the rainy period indicated horizontal heat advection from the vicinities of the irrigated crops.

Key Wordslatent heat flux, sensible heat flux, soil heat flux.

 

Resumo: Imagens do satélite Landsat 8 foram usadas com o algoritmo SAFER (Simple Algorithm For Evapotranspiration Retrieving) para a quantificação do balanço de energia nas culturas irrigadas do município de Juazeiro, Nordeste do Brasil, abrangendo diferentes condições termo hidrológicas nos anos de 2013 e 2014. Duas das imagens representaram as condições úmidas logo após o período chuvoso (maio a junho) enquanto as outras foram dentro do período de condições climáticas mais secas (setembro a outubro). Os valores médios dos pixels para radiação solar global (RG) variaram de 19,6 ± 0,5 a 26,2 ± 0,2 MJ m-2 dia-1 enquanto que para o saldo de radiação (Rn) esta faixa foi de 8,2 ± 0,2 a 11,9 ± 0,3 MJ m-2 dia-1. Para os fluxos de calor latente (λE) e calor sensível (H) estes estiveram respectivamente nas faixas de 7,5 ± 3,3 a 10,5 ± 2,3 e -2,1 ± 2,3 a 4,0 ± 3,3 MJ m-2 dia-1. O fluxo de calor no solo (G) para todas as condições irrigadas esteve em torno de 0,4 ± 0,1 MJ m-2 dia-1. Logo após o período chuvoso as frações de Rn usadas com λE foram de 112 e 119%, para respectivamente, 2013 e 2014. Os valores correspondentes para o período mais seco foram de 0,63 e 0,98. H negativo e λE maior que Rn em largas áreas ocorreram logo após o período chuvoso indicando aporte adicional de energia por advecção das áreas vizinhas às culturas irrigadas.

Palavras-chavefluxo de calor latente, fluxo de calor sensível, fluxo de calor no solo.

 

1 Researchers, Embrapa Satellite Monitoring, CEP 13070-15, Campinas-SP. Phone: 55 (19) 32116200, E-mails: heriberto.teixeira@embrapa.br; janice.leivas@embrapa.br; ricardo.andrade@embrapa.br
2 Professor , São Paulo State University, Ilha Solteira-SP. fbthtang@agr.feis.unesp.br 

 

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