Determining sensible and latent heat fluxes at satellite grid scales by two-wavelength scintillometry

摘要

A novel two-wavelength scintillometry system was deployed to determine the large-area averaged evaporation over topographically complex mixed-use farmland, at scales comparable to satellite data. Good average energy balance closure of 94% indicates reliable scintillometer fluxes. For near-zero crosswind speeds the surface energy balance is up to 30% under-closed, and at high wind speeds (and high friction velocity) there is up to 25% over-closure. The method has been shown to be powerful in capturing large-area land- atmosphere heat flux information, and is a convenient, cost effective, non-invasive ground- based remote sensing technique.