Abstract
Observation of air temperatures was conducted simultaneously in urban and sub-urban areas in Tokyo for the validation of a one-dimensional urban canopy model. The observation results showed that the distribution of daytime temperature was inhomogeneous due to the presence of insolation, while temperature at nighttime was not remarkably different among the measurement points. Averaged temperature in sub-urban area tends to be higher than that of urban area during daytime. However, at nighttime, temperature in urban area was about 1 degree higher. This suggests that, during our measurement period, typical heat island phenomenon occurred. Using these observed results, we evaluated numerical model performance. The performance was largely affected by solar radiation used in the model, that is, calculated daytime temperature was under estimated as solar radiation was obtained from GPV of JMA-RSM. On the other hand, the performance was fairly improved using solar radiation obtained form sunshine percentage data provided by AMeDAS sites.
