With the meteorological stations, which may cause the overestimation

With the rapid
growth of the population, the urbanization has been accelerated. The
Urbanization impacts environment and ecology by altering energy flow and
nutrient cycles. Thus, quantifying the impacts of urbanization to the
environment is important for the environmental and ecological studies. The
Impervious Surface Area (ISA) is considered as an indicator of urbanization and
environmental health. Remote sensing techniques, especially recent study
combining TMA method with improved nighttime light data (EANTLI) showed the
promising accuracy for ISA estimation. Meanwhile, the global warming is one
environment problem associated with rapid population increase. The previous
studies mainly used the near surface air temperature records obtained from the
meteorological stations, which may cause the overestimation of the observed
temperature increase.

The objectives of
this study were: (1) to generate the time-series ISA fraction map from 2001 to
2012 in East Asia, to test whether the new method can be applied appropriately
for time-series MODIS data and larger study area as a case study (2) to use the
results of ISA fraction maps from 2001 to 2012, to assess the ISA change of
metrological stations in Chinaand Japan, and then investigate how ISA change
impacts the temperature records.

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 The results showed one important finding is
that the relationship between ISA % and EANTLI was fit in one relation in East
Asia region, which differed from previous study in Southeast Asia. This result
might be caused by different light use efficiency in different economic
developing countries. In China, among 193 stations, 56 stations experienced ISA
increase and no change for the rest 137 stations, while no ISA change was
observed for all 211 Japanese stations, during the 2001 to 2012. The ISA level
20% was used to determine the rural or urban weather stations, and the results
showed there was significant difference in temperature trend between ISA 0~20%
and 20~100% groups in Japan.

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