Observations of Evaporation Efficiency and Thermal Environment in Shinjyuku-Gyoen Park

Abstract

In this paper, we show the results of micro-climatological observations performed in large park "Shinjyuku Gyoen" during summer. According to the eddy correlation measurement, latent heat flux at the lawn surface was about 2/3 of net radiation in mid-day, and evaporation efficiency was estimated about 0.4 through the observation period. The air temperature difference between under tree crown and outside sunny place is less than 1 degree even in mid-day. Therefore, the thermal comfort under the tree is mainly due to the difference of radiation environment.