Abstract
By using the global atmospheric general circulation model CAM4.0 including an urban canopy parameterization scheme, the possible impacts of large-scale urbanization in East China on East Asian winter monsoon was investigated via idealized numerical experiments. Results suggest that large-scale urbanization can cause a significant warming effect in both surface temperature and air temperature near the surface over most areas of East China. Meanwhile, large-scale urbanization also alters the surface energy balance, causing evident increases in net surface long-wave radiation and sensible heat flux as well as intensified surface thermal heating to the atmosphere. Forced by the surface thermal heating anomalies induced by the large-scale urban expansion, East Asian winter monsoon circulation exhibits distinct changes. Overall, the extensive urbanization over East China will weaken East Asian winter monsoon, but intensify winter monsoon in northeast China.
Highlights
By using the global atmospheric general circulation model CAM4.0 including an urban canopy parameterization scheme, the possible impacts of large-scale urbanization in East China on East Asian winter monsoon was investigated via idealized numerical experiments
2.1 Control run Firstly, simulation results of CTL run are compared with NCEP/National Center of Atmospheric Research (NCAR) reanalysis to evaluate the model performance in simulating climate over East Asia
CAM3.1 is able to capture the basic features of winter atmospheric general circulation and temperature over East Asia, which provides the basis for the sensitivity study
Summary
By using the global atmospheric general circulation model CAM4.0 including an urban canopy parameterization scheme, the possible impacts of large-scale urbanization in East China on East Asian winter monsoon was investigated via idealized numerical experiments. Forced by the surface thermal heating anomalies induced by the large-scale urban expansion, East Asian winter monsoon circulation exhibits distinct changes. IPCC AR4 report [1] states that LULCC can affect climate at local/regional scales and at large scales through adjustments in atmospheric general circulation. The rapid expansion of urban areas in East China is unprecedented in spatial extent and intensity and is expected to modify regional land surface properties dramatically, especially the surface thermal forcing to the atmos-. As winter usually has stronger UHI than other seasons and the global climate models demonstrate better performance in simulating winter climate [27,28], only the impacts of large-scale urbanization on winter monsoon and climate are investigated in this study
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