Estimation of Sensible and Latent Heat Fluxes Using Surface Renewal Method: Case Study of a Tea Plantation

An experiment of sensible and latent heat flux measurement was conducted in a tea plantation near the Yangtze River within Danyang of Jiangsu Province, China. High-frequency (similar to 10 Hz) air temperature measurement with fine-wire thermocouples (circle divide = 50 mu m) was used for the estimation of sensible heat flux (H), and latent heat flux (LE) was extracted as a residual of the energy balance equation using additional measurements of net radiation (R-n) and soil heat flux (G). Results were compared against the eddy covariance (EC) system under unstable conditions only, and days with high precipitation were excluded from further analysis. Half-hourly datasets of the sensible heat flux estimated using the surface renewal method (SR) (H-SR) and measured by the EC system (H-EC) were analyzed. Results showed good agreement with R-2 = 0.80, root mean square error (RMSE) = 27.87 W m(-2), relative error (RE) = 9.02%, and a regression slope of 0.68-this slope was used for the calibration of the uncalibrated H-SR estimated by SR. On the other hand, the half-hourly dataset of LESR was regressed against EC, and it showed good agreement with relatively high R-2 = 0.93, RMSE = 32.99 W.m(-2), and RE = 5.67%. Hence, the SR method may estimate the surface fluxes at a relatively low cost, ultimately improving calculations of evapotranspiration. Thus, the SR method could provide an economical tool for improving crop water management of tea plantations.

Automated summary

An experiment on sensible and latent heat flux measurement was conducted in a tea plantation in Jiangsu Province, China. The study showed that the surface renewal method could estimate sensible heat flux at a relatively low cost and provide an economical tool for improving crop water management in tea plantations with good accuracy.