Long-term energy flux measurements over an irrigation water storage using scintillometry

McJannet, David, Cook, Freeman, McGloin, Ryan, McGowan, Hamish, Burn, Stewart and Sherman, Brad (2013) Long-term energy flux measurements over an irrigation water storage using scintillometry. Agricultural and Forest Meteorology, 168 93-107. doi:10.1016/j.agrformet.2012.08.013

Author McJannet, David
Cook, Freeman
McGloin, Ryan
McGowan, Hamish
Burn, Stewart
Sherman, Brad
Title Long-term energy flux measurements over an irrigation water storage using scintillometry
Journal name Agricultural and Forest Meteorology   Check publisher's open access policy
ISSN 0168-1923
Publication date 2013-01-15
Sub-type Article (original research)
DOI 10.1016/j.agrformet.2012.08.013
Volume 168
Start page 93
End page 107
Total pages 5
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2014
Language eng
Abstract An analysis is presented of the long-term energy balance of a small water body in south-east Queensland, Australia. The main focus of this study was on the use of scintillometry to determine the turbulent fluxes of sensible and latent heat. A novel approach is utilized for identifying periods where the scintillometry measurement footprint extends beyond the water surface. This approach relies on comparison of ‘inferred’ water surface temperature and measured skin temperature. The ‘inferred’ temperature is an independent assessment of water skin temperature derived through rearrangement of key equations in the scintillometry calculation scheme. An extensive dataset is used to investigate the processes controlling heat and vapour fluxes and to develop simple relationships that can be used for reliable predictions. These relationships are used to fill missing measurements in the dataset and to construct a complete energy balance for an 18 month period. The long-term data set is used to describe the diurnal, seasonal and annual variations in energy fluxes and to explore issues related to energy balance closure. Average energy balance closure across the study was 82%, however closure was much better during the winter than the summer. The key factors likely to lead to errors in energy balance closure are considered and it is concluded that the most likely causes are underestimation of latent heat fluxes, advection of energy that is not measured by the scintillometer, or overestimation of net radiation.
Keyword Energy budget
Latent heat flux
Sensible heat flux
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2014 Collection
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Citation counts: TR Web of Science Citation Count  Cited 8 times in Thomson Reuters Web of Science Article | Citations
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Created: Fri, 19 Oct 2012, 09:49:39 EST by Claire Lam on behalf of School of Geography, Planning & Env Management