Abstract
The estimation of evapotranspiration (ET) is essential for meteorological modeling of surface exchange processes, as well as for the agricultural practice of irrigation management. Hitherto, a number of methods for estimation of ET at different temporal scales and climatic conditions are constantly under investigation and improvement. One of these methods is surface renewal (SR). Therefore, the premise of this review is to present recent developments and applications of SR for ET measurements. The SR method is based on estimating the turbulent exchange of sensible heat flux between plant canopy and atmosphere caused by the instantaneous replacement of air parcels in contact with the surface. Additional measurements of net radiation and soil heat flux facilitate extracting ET using the shortened energy balance equation. The challenge, however, is the calibration of SR results against direct sensible heat flux measurements. For the classical SR method, only air temperature measured at high frequency is required. In addition, a new model suggests that the SR method could be exempted from calibration by measuring additional micrometeorological variables. However, further improvement of the SR method is required to provide improved results in the future.
Highlights
Agrometeorology deals with the interaction between climate and agriculture and the processes of energy and mass exchange between biosphere and atmosphere
In the surface renewal (SR) method, the estimation of H is based on high-frequency measurements of air temperature and LE is obtained as the residual of the shortened energy balance equation
Where H is uncalibrated sensible heat flux measured by SR and H is sensible heat flux measured with Eddy Covariance (EC). α is the calibration factor estimated by calibrating the SR method against any independent method (i.e., EC and Bowen Ratio (BR))
Summary
Agrometeorology deals with the interaction between climate and agriculture and the processes of energy and mass exchange between biosphere and atmosphere. Different micrometeorological methods have been used for the estimation of ET, such as Bowen Ratio (BR), Eddy Covariance (EC), Optical Scintillation (OS), and Advances in Meteorology weighing lysimeter methods. These methods are expensive and the sensors used are sensitive and vulnerable to damage and require extensive fetch and site homogeneity [5]. The Bowen Ratio (BR) method requires extensive fetch and responsiveness to the biases of instrument used for estimating the air temperature and water vapour pressure at two levels [10]. This review article aims to provide a broad outlook for the researchers working on ET estimation using the SR method
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