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Quantification of surface energy fluxes from a small water body using scintillometry and eddy covariance
Author(s) -
McGloin Ryan,
McGowan Hamish,
McJannet David,
Cook Freeman,
Sogachev Andrey,
Burn Stewart
Publication year - 2014
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1002/2013wr013899
Subject(s) - eddy covariance , scintillometer , sensible heat , environmental science , latent heat , covariance , energy balance , flux (metallurgy) , evaporation , atmospheric sciences , turbulence , meteorology , statistics , mathematics , geology , geography , materials science , ecosystem , physics , ecology , atmospheric turbulence , metallurgy , biology , thermodynamics
Accurate quantification of evaporation from small water storages is essential for water management and planning, particularly in water‐scarce regions. In order to ascertain suitable methods for direct measurement of evaporation from small water bodies, this study presents a comparison of eddy covariance and scintillometry measurements from a reservoir in southeast Queensland, Australia. The work presented expands on a short study presented by McJannet et al. (2011) to include comparisons of eddy covariance measurements and scintillometer‐derived predictions of surface energy fluxes under a wide range of seasonal weather conditions. In this study, analysis was undertaken to ascertain whether important theoretical assumptions required for both techniques are valid in the complex environment of a small reservoir. Statistical comparison, energy balance closure, and the relationship between evaporation measurements and key environmental controls were used to compare the results of the two techniques. Reasonable agreement was shown between the sensible heat flux measurements from eddy covariance and scintillometry, while scintillometer‐derived estimates of latent heat flux were approximately 21% greater than eddy covariance measurements. We suggest possible reasons for this difference and provide recommendations for further research for improving measurements of surface energy fluxes over small water bodies using eddy covariance and scintillometry.