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Open AccessArticle

An Assessment of Coordinate Rotation Methods in Sonic Anemometer Measurements of Turbulent Fluxes over Complex Mountainous Terrain

1
Department of Earth Sciences “Ardito Desio”, Università degli Studi di Milano, Via Mangiagalli, 34, 20133 Milano, Italy
2
Department of Physics, Università degli Studi di Torino, Via Pietro Giuria, 1, 10125 Torino, Italy
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(6), 324; https://doi.org/10.3390/atmos10060324
Received: 14 May 2019 / Revised: 5 June 2019 / Accepted: 8 June 2019 / Published: 13 June 2019
(This article belongs to the Special Issue Turbulence in Atmospheric Boundary Layers)
The measurement of turbulent fluxes in the atmospheric boundary layer is usually performed using fast anemometers and the Eddy Covariance technique. This method has been applied here and investigated in a complex mountainous terrain. A field campaign has recently been conducted at Alpe Veglia (the Central-Western Italian Alps, 1746 m a.s.l.) where both standard and micrometeorological data were collected. The measured values obtained from an ultrasonic anemometer were analysed using a filtering procedure and three different coordinate rotation procedures: Double (DR), Triple Rotation (TR) and Planar Fit (PF) on moving temporal windows of 30 and 60 min. A quality assessment was performed on the sensible heat and momentum fluxes and the results show that the measured turbulent fluxes at Alpe Veglia were of a medium-high quality level and rarely passed the stationary flow test. A comparison of the three coordinate procedures, using quality assessment and sensible heat flux standard deviations, revealed that DR and TR were comparable, with significant differences, mainly under low-wind conditions. The PF method failed to satisfy the physical requirement for the multiple planarity of the flow, due to the complexity of the mountainous terrain. View Full-Text
Keywords: coordinate rotation methods; sonic anemometers; turbulence; boundary layer; complex mountainous terrain; sensible heat flux; quality assessment; Veglia–Devero natural park coordinate rotation methods; sonic anemometers; turbulence; boundary layer; complex mountainous terrain; sensible heat flux; quality assessment; Veglia–Devero natural park
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MDPI and ACS Style

Golzio, A.; Bollati, I.M.; Ferrarese, S. An Assessment of Coordinate Rotation Methods in Sonic Anemometer Measurements of Turbulent Fluxes over Complex Mountainous Terrain. Atmosphere 2019, 10, 324.

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