Abstract
Numerical weather prediction models have been improved to adequately represent the growing influence of urban areas to surrounding weather. Recently, updated LES-derived empirical equations on the aero-dynamic urban surface parameters displacement height d, and roughness length for momentum z0m, have been introduced. Using a high spatial resolution d, z0m, and anthropogenic heat emission distribution, dry case simulation was conducted using Weather Research and Forecasting Model with domains covering Tokyo, Nagoya, and Osaka. It was found that default WRF generally underestimate roughness. Results were also compared with actual observations of 2 m air temperature and surface wind speed, and were found to be well represented in the model when detailed parameters were used.
