National Centre for Groundwater Research and Training, College of Science and Engineering, Flinders University, Australia
School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, USA
Abstract. The aim of this research is to develop evaporation and transpiration products for Australia based on the maximum entropy production model (MEP). We introduce a method into the MEP algorithm of estimating the required model parameters over the entire Australia through the use of pedotransfer function, soil properties and remotely sensed soil moisture data. Our algorithm calculates the evaporation and transpiration over Australia on daily timescales at the 5 km2 resolution for 2003–2013.
The MEP evapotranspiration (ET) estimates are validated using observed ET data from 20 Eddy Covariance (EC) flux towers across 8 land cover types in Australia. We also compare the MEP ET at the EC flux towers with two other ET products over Australia; MOD16 and AWRA-L products. The MEP model outperforms the MOD16 and AWRA-L across the 20 EC flux sites, with average root mean square errors (RMSE), 8.21, 9.87 and 9.22 mm/8 days respectively. The average mean absolute error (MAE) for the MEP, MOD16 and AWRA-L are 6.21, 7.29 and 6.52 mm/8 days, the average correlations are 0.64, 0.57 and 0.61, respectively. The percentage Bias of the MEP ET was within 20 % of the observed ET at 12 of the 20 EC flux sites while the MOD16 and AWRA-L ET were within 20 % of the observed ET at 4 and 10 sites respectively. Our analysis shows that evaporation and transpiration contribute 38 % and 62 %, respectively, to the total ET across the study period which includes a significant part of the “millennium drought” period (2003–2009) in Australia. The data (Abiodun et al., 2019) is available at https://doi.org/10.25901/5ce795d313db8.
How to cite. Abiodun, O., Batelaan, O., Guan, H., and Wang, J.: A Maximum Entropy Production Evaporation – Transpiration Product for Australia, Earth Syst. Sci. Data Discuss. [preprint], https://doi.org/10.5194/essd-2019-70, 2019.
Received: 03 May 2019 – Discussion started: 18 Jul 2019
Evaporation, Transpiration, and Evapotranspiration Products for Australia based on the Maximum Entropy Production model (MEP). We produce each of these datasets over the entire Australia for the years 2003–2013 on daily timescales at the 5 km spatial resolution. The data have been tested across various land covers and regions of Australia where measured data is available. These products may be used for research, education and other relevant studies and/or analysis.
Evaporation, Transpiration, and Evapotranspiration Products for Australia based on the Maximum...