Effects of solar radiation and correction of surface temperature by net radiation estimates in northern Pantanal

Vagner Marques Pavão; Marcelo Sacardi Biudes; Nadja Gomes Machado; Carlos Alexandre Santos Querino

doi:10.1117/1.JRS.12.046004

10 October 2018 Effects of solar radiation and correction of surface temperature by net radiation estimates in northern Pantanal

Vagner Marques Pavão, Marcelo Sacardi Biudes, Nadja Gomes Machado, Carlos Alexandre Santos Querino

Author Affiliations +

Journal of Applied Remote Sensing, Vol. 12, Issue 4, 046004 (October 2018). https://doi.org/10.1117/1.JRS.12.046004

Abstract

Net radiation (Rn) is a critical variable in estimating energy balance and evapotranspiration by remote sensing techniques on a regional scale. The objective of this paper is to evaluate the effect of estimated and measured instantaneous solar radiation (Rg) and the atmospheric correction of surface temperature by Landsat 8 images on the estimated surface Rn in northern Pantanal. Rn and meteorological factors were measured on a floodplain and on two nonflooded areas in northern Pantanal. Rg was estimated by models proposed by Zillman et al. (Rg_Zillman) and Allen et al. (Rg_Allen). Surface temperature was corrected by atmospheric and emissivity effects. Annual and seasonal averages of solar radiation were not different among the experimental sites. The floodplain area featured higher net radiation than both nonflooded areas. Instantaneous Rn_inst estimated by measured Rg and with Rg_Allen were not different from measured Rn_inst. Rn_inst estimated by surface temperature was, on average, 5.7% higher, with a 22% error lower than Rn_inst estimated with brightness temperature. The current study highlights the possibility of estimating Rn_inst by Rg_Allen and the need for correcting the effect of the atmosphere and surface emissivity to estimate surface temperature and Rn_inst.

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Vagner Marques Pavão, Marcelo Sacardi Biudes, Nadja Gomes Machado, and Carlos Alexandre Santos Querino "Effects of solar radiation and correction of surface temperature by net radiation estimates in northern Pantanal," Journal of Applied Remote Sensing 12(4), 046004 (10 October 2018). https://doi.org/10.1117/1.JRS.12.046004

Received: 23 May 2018; Accepted: 18 September 2018; Published: 10 October 2018

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