Bridging Thermal Infrared Sensing and Physically-Based Evapotranspiration Modeling: From Theoretical Implementation to Validation Across an Aridity Gradient in Australian Ecosystems

K Mallick; E Toivonen; I Trebs; E Boegh; J Cleverly; D Eamus; H Koivusalo; D Drewry; SK Arndt; A Griebel; J Beringer; M Garcia

Journal article

Bridging Thermal Infrared Sensing and Physically-Based Evapotranspiration Modeling: From Theoretical Implementation to Validation Across an Aridity Gradient in Australian Ecosystems

K Mallick, E Toivonen, I Trebs, E Boegh, J Cleverly, D Eamus, H Koivusalo, D Drewry, SK Arndt, A Griebel, J Beringer, M Garcia

Water Resources Research | AMER GEOPHYSICAL UNION | Published : 2018

DOI: 10.1029/2017WR021357

Abstract

Thermal infrared sensing of evapotranspiration (E) through surface energy balance (SEB) models is challenging due to uncertainties in determining the aerodynamic conductance (gA) and due to inequalities between radiometric (TR) and aerodynamic temperatures (T0). We evaluated a novel analytical model, the Surface Temperature Initiated Closure (STIC1.2), that physically integrates TR observations into a combined Penman-Monteith Shuttleworth-Wallace (PM-SW) framework for directly estimating E, and overcoming the uncertainties associated with T0 and gA determination. An evaluation of STIC1.2 against high temporal frequency SEB flux measurements across an aridity gradient in Australia revealed a ..

View full abstract

University of Melbourne Researchers

Stefan Arndt Author

Related Projects (2)

MEGA-MOBILE ECOSYSTEM GAS-EXCHANGE ANALYSER FOR AUSTRALIAN LANDSCAPES

This Mobile Ecosystem Gas-exchange Analyser will be able to continuously monitor water, energy, carbon and nitrogen exchange in a multitude ..

Methane uptake of forest soils

This project will provide a detailed understanding of capacity of soils in Australia to sequester the greenhouse gas methane. It will identi..

Grants

Awarded by National Aeronautics and Space Administration

Funding Acknowledgements

This study was funded by the Luxembourg Institute of Science and Technology (LIST) under project BIOTRANS (project code 00001145). Partial funding for this research was provided through the FNR-DFG CAOS-2 project grant (INTER/DFG/14/02); and through HiWET (High-resolution modeling and monitoring of Water and Energy Transfers in wetland ecosystems) consortium funded by BELSPO and FNR under the programme STEREOIII (INTER/STEREOIII/13/03/HiWET; contract NR SR/00/301). We are grateful to all Australian and international collaborators, OzFlux PIs, and all the funding agencies that have contributed to establishing Terrestrial Ecosystem Research Network (TERN) and Ozflux. The authors declare no conflict of interest. This work utilized data collected by grants funded by the Australian Research Council (DP0344744, DP0772981, DP120101735, DP130101566, and LE0882936). Jason Beringer is funded under an ARC Future Fellowship (FT110100602). DTD acknowledges support of the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. KM designed the analysis; ET and KM performed the analysis; KM, ET, and IT developed the initial version of the manuscript; and all the coauthors make significant contribution in editing the manuscript. The authors declare no conflict of interests. Data used in the current analysis is available through the OzFlux data portal (http://data.ozflux.org.au/portal/pub/listPubCollections.jspx), and we have used data level-3 data that was available in csv format in the fluxnet repository (http://data.ozflux.org.au/portal/pub/viewColDetails.jspx?collection. id=1882723&collection.owner. id=450& viewType=anonymous).