Articles | Volume 15, issue 1
Atmos. Meas. Tech., 15, 95–115, 2022
Atmos. Meas. Tech., 15, 95–115, 2022
Research article
05 Jan 2022
Research article | 05 Jan 2022

Air temperature equation derived from sonic temperature and water vapor mixing ratio for turbulent airflow sampled through closed-path eddy-covariance flux systems

Xinhua Zhou et al.

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Revised manuscript under review for GI
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Cited articles

AmeriFlux: Data Variables, Lawrence Berkeley National Laboratory, 1–12, available at: (last access: 11 December 2021), 2018. 
Apogee Instruments Inc.: Owner's Manual: Aspirated Radiation Shield (model: TS-100), Logan, UT, USA, 19 pp., 2013. 
Aubinet, M., Vesala, T., and Papale, D. (Eds.): Eddy Covariance: A Practice Guide to Measurement and Data Analysis, Springer, NY, USA, 438 pp.,, 2012. 
Barrett, E. W. and Suomi, V. E.: Preliminary report on temperature measurement by sonic means, J. Atmos. Sci., 6, 273–276,<0273:PROTMB>2.0.CO;2, 1949. 
Blonquist, J. M. and Bugbee, B.: Air temperature, in: Agroclimatology: Linking Agriculture to Climate, Agronomy Monographs, edited by: Hatfield, J., Sivakumar, M., and Prueger, J., American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc., Madison, WI, USA, https//, 2018. 
Short summary
Air temperature from sonic temperature and air moisture has been used without an exact equation. We present an exact equation of such air temperature for closed-path eddy-covariance flux measurements. Air temperature from this equation is equivalent to sonic temperature in its accuracy and frequency response. It is a choice for advanced flux topics because, with it, thermodynamic variables in the flux measurements can be temporally synchronized and spatially matched at measurement scales.