裸地面におけるエネルギー輸送の研究

Abstract

An air-ground interaction observing facility is developed for the long term observationof the energy and water exchange between the atmosphere and the earth. To search for simpleand reliable method to measure the turbulent energy flux near the ground, an intensive obser-vation was carried out including the turbulent fluctuations and mean quantities near the ground.The obtained results are as follows: 1) The effect of humidity fluctuations is found to be im-portant in measuring the sensible heat flux accurately. 2) The layer very close to the surfaceis too unsteady most of the time to apply the similarity law. 3) The estimation of the surfacetemperature through the bulk method is in agreement with the measurement with the radiationthermometer within 2 degrees. The estimated surface relative humidity and the measuredrelative humidity at 5 cm height is in good agreement, suggesting the usefulness of the relativehumidity in the investigation of the humidity field near the surface.