Ehdotuksen tiedot

The document specifies a test method for estimating the magnitude of radiosonde temperature sensor warming, induced by direct solar radiation, based on variations in air pressure, temperature, ventilation speed, tilt angle of its supporting sensor boom, and light illumination angle on the boom through a laboratory evaluation. This document will describe the following: The essential components of the laboratory setup are a climate chamber, wind-tunnel, a test cell, thermometers, pressure and vacuum gauges, a laser anemometer and a solar simulator. These components are summarised in Clause 5. Clauses 6–8 provide details on test preparation, the procedure for installing a radiosonde in the test cell, the operation of the laboratory setup, the experimental range and sequence, and data processing. In Clauses 9 and 10, a method to evaluate and report uncertainty of the determined radiation errors on the temperature using the uncertainty propagation law, based on a mathematical model, is proposed.