Estimating sensible and latent heat fluxes over rice using surface renewal

Abstract

The performance of surface renewal (SR) analysis for estimating sensible (H) and latent (λE) heat fluxes has been analysed over a sprinkler irrigated rice. Similarity principles were not fully met during the experiment and the (H+λE) measured values with the eddy covariance did not close the surface energy-balance. H and λE estimates using SR analysis were reliable and provided a reasonable energy-balance closure. The Bowen ratio was also estimated using SR analysis. Good estimates were obtained though mainly under unstable atmospheric conditions.

Water balances and evapotranspiration in water- and dry-seeded rice systems

“…Since the H from SR was quite similar to H from EC, it also implies that the lack of closure is likely due to the EC measurement of LE. Castellví et al (2006) also reported good closure for SR measurements over rice and poor closure for EC measurements over rice. Thus, using the REB method to determine ET c and K c values seems much more reasonable than direct usage of LE from EC measurements.…”

Quantifying the prediction accuracy of a 1-D SVAT model at a range of ecosystems in the USA and Australia: evidence towards its use as a tool to study Earth's system interactions

“…In this study, EBC was principally evaluated by performing a regression analysis (e.g. see Wilson and Baldocchi, 2000;Wilson et al, 2002;Castellvi et al, 2006). The linear regression coefficients (slope and intercept) as well as the coefficient of determination (R 2 ) were calculated from the ordinary least squares (OLS) relationship between the 30 min estimates of the dependent flux variables (LE+H ) and the independently derived available energy (R net −G−S).…”

Surface layer scintillometry for estimating the sensible heat flux component of the surface energy balance

“…Besides some of the technical limitations related to the required horizontal homogeneity of the surface layer, measurement methods for determining H such as EC, Bowen ratio energy balance (BREB), 3,8,[14][15][16] surface renewal (SR), [17][18][19][20] and others are also very expensive if used at multiple points or locations for wider areas since that would require a number of such units. 10,21 The scintillometer method has been applied and tested by several authors 1,3,4,9,10,[21][22][23] and studies carried out in the past have revealed that the scintillometer method is an attractive alternative to the commonly-used measurement methods, such as EC, for the estimation of H and τ.…”