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Preprints
https://doi.org/10.5194/essd-2019-70
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-2019-70
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  18 Jul 2019

18 Jul 2019

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A revised version of this preprint is currently under review for the journal ESSD.

A Maximum Entropy Production Evaporation – Transpiration Product for Australia

Olanrewaju Abiodun1, Okke Batelaan1, Huade Guan1, and Jingfeng Wang2 Olanrewaju Abiodun et al.
  • 1National Centre for Groundwater Research and Training, College of Science and Engineering, Flinders University, Australia
  • 2School 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.

Olanrewaju Abiodun et al.

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Data sets

A Maximum Entropy Production evaporation and transpiration dataset at 0.05 degree across Australia for 2003–2013 O. Abiodun, O. Batelaan, H. Guan, and J. Wang https://doi.org/10.25901/5ce795d313db8

Olanrewaju Abiodun et al.

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Short summary
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...
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