By G. Gerosa
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Example text
In micrometeorological methods, which depend on the measurements of the gradients, such as Bowen Ratio Energy Budget (BREB), advective, or flux-gradient methods, calibrated and carefully matched sensors are needed. In addition, other requirements and limitations exist for each of these methods. To obtain the sensible heat flux density, the BREB requires measurements of the ground heat flux, biomass storage, and net radiation, and two pairs of high resolution matched Evapotranspiration Estimation Using Micrometeorological Techniques 23 temperature and humidity measurements.
1997) noted that the ramps observed by Gao et al. (1989) and Paw U et al. (1992) had non-instantaneous terminations. They developed a set of equations to obtain the ramp dimensions, with the assumption that the spacing between ramps (s) was zero. Surface Renewal (SR) analysis, as used in plant canopies, was originally conceived of as a simple “transilient” theory (Stull, 1984) in a pseudo-Lagrangian sense (Paw U et al. 1995). In SR only two heights are considered, some height above a plant canopy, and a height representing the entire plant canopy.
These include eddy-covariance (Swinbank 1955), the eddy-accumulation method (Desjardins, 1972), and gradient/micrometeorological methods (Pruitt, 1963). All of these methods require data logging capable of recording at a range of acceptable frequencies. In the Eddy Covariance method, high frequency logging (10 Hz or higher) is needed for the 3-D velocity field and the scalar of interest. This, generally, requires sonic anemometer, which is relatively complicated and expensive. The scalar must also be sampled with costly, complex sensors at similar frequencies.
