Automatic Eddy-Flux Measurement with the Evapotron

Abstract

The Evapotron, an instrument designed to measure vertical fluxes of heat and water vapor in the lower atmosphere, is described. Completely transistorized, the instrument consumes 50–100 watts and can be operated by a scientific technician. By means of an energy balance comparison the accuracy of the instrument has been demonstrated to be within about 5%. A detailed technical description is to be published separately.