Abstract
The aim of this study was to evaluate the errors generated on the reference evapotranspiration (ET0) estimation by Penman-Monteith FAO 56 (PMF 56) when employed simplified models to estimate the global radiation (HG) are based on the air temperature. We evaluated 28 automatic weather stations (EMA's) belonging to the National Institute of Meteorology (INMET) network, in different biomes of Mato Grosso state. Was evaluated fifteen simplified models of HG estimate calibrated regionally and five models without calibration. It was used as a reference ETo obtained by PMF 56, with HG measure. The statistical performance were employed mean bias error (MBE), root mean square error (RMSE), adjustmentindex (d) and the cumulative numerical order of the different models in each index. The regional calibration models HG estimation models improve the estimates of ETo. Can be used Bristow and Campbell (1984) and Goodin et al. (1999), De Jong and Stewart (1993) models to HGestimates and then ET0 to Amazon, Cerrado and Pantanal, respectively.
Highlights
Solar radiation can be considered as the primary source of renewable and natural energy to the environment, which are important in many physical, chemical, biological and biophysical processes that occur on Earth's surface, with applications in areas such as agronomy, ecology, solar energy systems, environment, oceanography, architecture, among others (DAUT et al, 2011; CARVALHO et al, 2011; SOUZA & ESCOBEDO, 2013)
The meteorological data collected by 28 automatic weather stations (EMA's) installed in the Mato Grosso state (Table 1) were obtained from the National Institute of Meteorology (INMET)
The annual variation in ETo values estimated by the Penman-Monteith FAO 56 (PMF 56) method for meteorological stations located at different latitudes and biomes of the Mato Grosso state, presented behavior similar of global radiation seasonality throughout the year, with higher values in summer and lower in winter (Figure 2)
Summary
The evapotranspiration (ET) is the most active variable of the hydrological cycle and the main component of the water balance in agricultural ecosystems It is an important parameter for the planning and management of water resources (RAZIEI&PEREIRA, 2013; FALAMARZI et al, 2014; MANCOSU et al, 2014). The conceptual developments of potential evapotranspiration refers to the maximum loss of water from a vegetated surface, low size, in full development and without water deficit, in order to reduce the effect of local advective energy. In this context, evapotranspiration can be directly proportional to the availability of solar energy and radiation balance (CHANG, 1968; PEREIRA et al, 1997; ALLEN et al, 1998; ALLEN et al, 2011)
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