Issues in monitoring evapotranspiration with radiometric temperature observations Academic Article uri icon

abstract

  • Use of radiometric surface temperature in standard bulk transport equations for computing heat fluxes has not been successful in general. This has been attributed to the significant differences existing between the radiative and the so-called "aerodynamic" temperature of the surface. Numerous studies have explored ways of accounting for the discrepancies between radiometric and aerodynamic temperatures. Radiometric temperature and surface flux observations collected during the 1999 Southern Great Plains Experiment (SGP99) over four field sites comprising the major land cover types for this region are used to evaluate these approaches. The results suggest correction schemes require site-specific calibration and therefore are not useful for regional applications. A more general approach, which accounts for the main factors affecting radiometric and aerodynamic temperatures and reduces the impact of errors in radiometric temperature observations, is presented.

author list (cited authors)

  • Kustas, W. P., Albertson, J. D., Scanlon, T. M., & Cahill, A. T.

publication date

  • December 2000