Eddy-correlation measurements of sensible heat fluxes over a grass surface

摘要: Direct measurements of sensible heat fluxes were conducted over a grass surface at Ladner, British Columbia, using yaw-sphere-thermometer eddy-correlation systems. The results show that for half-hour averaging periods, there is no phase-lag between and net radiation flux densities. Field comparison two systems gave good consistent agreement. At height 2 m above ground horizontal crosswind separation 1.5 m, less than 5% variability was noted in the measured fluxes. For 19-m separation, 20%. aridity index (α) advanced by Priestley Taylor (1972), shown to be potentially useful climatic indicator.