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Influence of the Sonic Anemometer Temperature Calibration on Turbulent Heat-Flux Measurements |
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| Authors: | Renzo Richiardone Massimiliano Manfrin Silvia Ferrarese Caterina Francone Vito Fernicola Roberto Maria Gavioso Luca Mortarini |
| Institution: | 1.Dipartimento di Fisica,Università di Torino,Torino,Italy;2.Dipartimento di Ingegneria Aerospaziale,Politecnico di Torino,Torino,Italy;3.INRIM—Istituto Nazionale di Ricerca Metrologica,Torino,Italy;4.ISAC-TO Istituto di Scienze dell’Atmosfera e del Clima—Sezione di Torino,Torino,Italy |
| Abstract: | The speed of sound in moist air is discussed and a more accurate value for the coefficient of the linear dependence of sonic temperature on specific humidity is proposed. An analysis of speed-of-sound data measured by three sonic anemometers in a climate chamber and in the field shows that the temperature response of each instrument significantly influences not only the determination of sonic temperature, but also its fluctuations. The corresponding relative contribution to the error in the evaluation of the temperature fluctuations and the turbulent heat fluxes can be as high as 40%. The calibration procedure is discussed and a method of correction is proposed. |
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