Geography Reference
In-Depth Information
REG scenario, urban land expansion in Southern Jiangsu province will
keep at a fast rate; urban land will mainly expand around the central cities,
mainly occupying cultivated land and forests. By contrast, built-up land
will expand dispersedly in the whole study area under CES scenario, and
built-up land expansion around the main cities will be restricted to some
degree.
(ii)
Monthly average temperature in Southern Jiangsu province shows a con-
sistent changing trend under different scenarios, but temperature range
shows significant difference. The highest value of monthly average tem-
perature appears in July under all scenarios, while the lowest one appears
in January. Besides, regional monthly average temperature is the highest in
2050 under REG scenario and the lowest in 2010 under CES scenario. In
addition, the difference in monthly average temperatures is the greatest in
summer and the smallest in winter.
(iii)
There is significant influence of the underlying surface on the spatial
pattern of temperature. The spatial pattern differs most greatly in 2050
under REG scenario and in 2010 under conservation scenario, especially in
July. The range of high-temperature regions is much wider in 2050 under
REG scenario than in 2010 under CES scenario. The high-temperature
regions are much wider in 2050 under REG scenario than it is under CES
scenario, especially in big cities such as Nanjing, Zhenjiang, Suzhou, and
Wuxi.
(iv)
Land use change in Southern Jiangsu province mainly influences regional
temperature through altering land surface net radiation and latent heat flux.
Land surface net radiation, which depends on land surface albedo and
emissivity, downward long-wave radiation and downward shortwave
radiation, plays a dominant role in influencing temperature. Meanwhile,
there is no significant influence of land use change on the spatial pattern of
latent heat flux. In addition, land surface albedo and emissivity play the
most important roles in influencing land surface net radiation, and there is
no significant influence of the underlying surface on downward long-wave
radiation and downward shortwave radiation.
This study revealed the influence of future land use change (especially urban
land expansion) on regional temperature in Southern Jiangsu province, and ana-
lyzed the impacts of land use change on the key biogeophysical parameters from
the perspective of land surface radiation budget and energy balance. The result of
this study is of great significance to the selection of reasonable land use mode to
mitigate regional climate change. The precipitation as another important aspect of
regional climate change has not been involved in this study. Therefore, it is still
necessary to carry out more in-depth research on the influence of land use change
on regional climate change.
