The urban effect on climate changes in Beijing-Tianjin-Tnagshan (BTT) regions over China

Overpopulation, the rapid development of industrialization and the acceleration of urban expansion, all of these factors have changed the characteristics of underlying surface and atmospheric environment, especially in the urban area. The urban effect on regional climate changes in BTT regions was analyzed by the Regional Atmospheric Model System (RAMS). We simulate and analyze three days changes during the time from July 1^st to 4^th, 2003 in the BTT areas. The results show that simulation and observation is almost the same. Furthermore, the rapid urbanization makes temperature and sensible heat flux increase significantly, but latent heat flux decrease in BTT regions.