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Underestimates of sensible heat flux due to vertical velocity measurement errors in non-orthogonal sonic anemometersAuthor(s): John M. Frank; William J. Massman; Brent E. Ewers
Source: Agricultural and Forest Meteorology. 171-172: 72-81.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
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Ecosystem Fluxes are Underestimated Due to Measurement Tool Errors
DescriptionSonic thermometry and anemometry are fundamental to all eddy-covariance studies of surface energy balance. Recent studies have suggested that sonic anemometers with non-orthogonal transducers can underestimate vertical wind velocity (w) and sensible heat flux (H) when compared to orthogonal designs. In this study we tested whether a non-orthogonal sonic anemometer (CSAT3, Campbell Scientific, Inc.) measures lower w and H than an orthogonal sonic anemometer (SATI/3Vx, Applied Technologies, Inc.) and through experimental manipulation we tested if this difference can be attributed to errors in the CSAT3. Four CSAT3s and one SATI/3Vx were mounted symmetrically in a horizontal array on top of the Glacier Lakes Ecosystem Experiments Site (GLEES) AmeriFlux scaffold (southeastern Wyoming, USA) and in close enough proximity to allow covariance measurements between neighboring sonic anemometers.
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CitationFrank, John M.; Massman, William J.; Ewers, Brent E. 2013. Underestimates of sensible heat flux due to vertical velocity measurement errors in non-orthogonal sonic anemometers. Agricultural and Forest Meteorology. 171-172: 72-81.
Keywordseddy covariance, energy balance closure, sonic anemometry, surface energy balance, systematic flux error
- All sonic anemometers need to correct for transducer and structural shadowing in their velocity measurements
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