Boundary-Layer Meteorology

, Volume 23, Issue 4, pp 415–424

Urban albedo as a function of the urban structure — A two-dimensional numerical simulation

Part II
  • Masaru Aida
  • Kiyoshi Gotoh

DOI: 10.1007/BF00116270

Cite this article as:
Aida, M. & Gotoh, K. Boundary-Layer Meteorol (1982) 23: 415. doi:10.1007/BF00116270


Urban albedo change as a function of urban geometrical structure has been examined by using a two-dimensional urban block-canyon array model. The complex multiple reflections of incident photons in the urban canyon are simulated by using a Monte-Carlo method. The photons are tracked until they leave the canyon or are completely absorbed. In the model, the direct and diffuse components of incident solar radiation are introduced and the specular and isotropic reflection characteristics are considered for the relevant urban surfaces. The result shows that the urban albedo decreases as the urban irregularity increases as indicated by the model experiment of Aida (1982). The dependence of albedo on the incident solar zenith angle observed in the experiment is also confirmed for various urban models.

As an application, some actual urban structures in the Marunouchi area in Tokyo are examined. Urban planning for absorption and reflection of solar radiation in urban areas is also discussed based on the analysis of the change in albedo with canyon dimensions and solar zenith angle.

Copyright information

© D. Reidel Publishing Co 1982

Authors and Affiliations

  • Masaru Aida
    • 1
  • Kiyoshi Gotoh
    • 1
  1. 1.Meteorological Laboratory, Yokohama National UniversityYokohamaJapan