Numerical Simulation Of Climate Effects Of Urbanization Over The Yangtze River Delta By LMDZ Model

Using LMDZ regional model and global model with two sets of numerical experiments to study the influence of Urbanization over the Yangtze River Delta on East-Asia climate and global atmospheric general circulation.The results suggest that the land use changing over Yangtze River Delta may induce regional and global climate anomalies, which is characterized by(1) The climate over the Yangtze river delta is getting warmer and drier, and the changing level of summer is higher than that of winter. Net radiation significantly increased, sensible heat flux increased while the latent heat flux decreased, and the local surface temperature increased significantly, monthly precipitation decreased. The Yangtze River Delta region is controlled by a large anticyclone water vapor flux anomalies, opposite the Bohai Bay region and the Northeast is controlled by a cyclonic water vapor flux anomalies. Eastern China, is the baroclinic situation, the low level of Yangtze River Delta region of negative anomalies of geopotential height, high-level positive anomaly of geopotential height. For winter, the situation of the Yangtze River Delta and the summer the situation is similar to the main local effect is still showing the warming and drying trend, but the magnitude was significantly smaller, surface temperature increased, precipitation anomalies with mainly in China East China Sea to the South China Sea area was the northeast to southwest trend, and abnormalities in this region of cyclonic vapor flux; winter low level of the Yangtze River Delta region is still negative anomalies of geopotential center, high-rise into positive anomaly potential center layer seems is still a baroclinic unusual structure, but different from the summer, this distribution pattern will enhance the winter northern high pressure;(2) Emerging wavetrains both in the Northern and Southern Hemisphere, the precipitation anomalies of the region of Equal, and the weakening of low-latitude zonal circulation.