Geography Reference
In-Depth Information
is widest and strongest among three urban land expansion scenarios. The
warming effect of decentralized urban land expansion scenario is on the
opposite.
(ii)
The different effects of different urban land expansion scenarios on
regional average precipitation are not very significant. Overall, regional
precipitation is largest under decentralized urban land expansion scenario,
slightly higher than the other two scenarios. On the opposite, regional
precipitation under centralized urban land expansion scenario is smallest.
Precipitations under difference scenarios are comparatively consistent
temporally. Meanwhile, spatial distribution of precipitation has significant
differences. The spatial distribution of precipitation is more concentrated
under centralized urban land expansion scenario, and presents a wider
scope, greater intensity of rainfall center. The distribution of precipitation
is more dispersed and the rainfall centers are still dispersed under decen-
tralized urban land expansion.
(iii)
Decentralized urban land expansion pattern is the suitable urbanization
pattern for mitigating climate change. Under decentralized urban land
expansion scenario, underlying surface change has little effect on climate
change, and showing a uniform distribution pattern in space. Under cen-
tralized urban land expansion scenario, there is a greater impact on climate
change, and the distribution is more concentrated in the space.
By analyzing effects of urban land expansion on regional temperature and
precipitation under different urban land expansion patterns, we concluded that
decentralized urban land expansion pattern is rational for ''resources-saving and
environment-friendly'' society construction. In further studies, we need to discuss
in-depth the spatial and temporal laws of regional underlying surface change on
other parameters that could affect ecological environment and its effect on human
welfare under different urban land expansion scenarios.
6.4 Summary
This chapter includes three case studies on the impact of future urbanization on
surface climate in China.
First, we analyzed the impact of urban land use change on regional temperature
and precipitation in summer in the Great Beijing area during 2030-2040 based on
the simulation results of WRF and archived data land use change and climate
change during 1995-2005. Results showed that urbanization in this area has
affected regional climate and has the potential to the increase of temperature and
precipitation in summer during 2030-2040. These results can support sustainable
urban planning to mitigate and adapt to climate change in the future.
Second, we performed a scenario-based simulation of influence of land use
change on regional temperature in Southern Jiangsu province, a typical region of
