蒸発量直接測定のための熱電対乾湿球温度計の補正法

Abstract

For the measurement of humidity fluctuation in the atmopheric boundary layer, wet-anddry-bulb thermocouple psychrometer has been used traditionally. However, in the directmeasurement of water vapor flux with eddy correlation method, underestimation of the flux isoften experienced due to its slow response to humidity fluctuation. The error in the watervapor flux measurement with thermocouple psychrometer was studied based on the dynamicresponse equations of wet-and dry-bulb thermometers. A new method of correction for theslow response of thermocouple psychrometer, with variable time constant in fluctuatingwind speed, is presented.