| Summary: | 碩士 === 國立嘉義大學 === 史地學系研究所 === 99 === This study is aimed to explore the climatic characteristic and urban-rural difference of temperature in the Chung-Chang-Tao area. We use the surface measurements of eight air quality stations of Taiwan Environmental Protection Administration in 1996-2009. Analyzed parameters include daily maximum temperature, daily minimum temperature, daily average temperature and diurnal temperature range. The comparison of land-use maps in 1996 and 2009 shows that monitoring stations of Dali, Nantou and Xianxi are located at the inland-urban, inland-rural and coastal-rural sites, respectively.
In respect of yearly and seasonal averages, Dali and Nantou have the maximums of daily maximum temperature, daily average temperature and diurnal temperature range, and Xianxi has the maximum of daily minimum temperature. The maximum of daily average temperature has a diurnal change of Dali in the daytime and Xianxi in the nighttime. It implies the effect of land-sea distribution on the climatic characteristic of temperature over this area.
The interannual variation of temperature shows that daily maximum temperature of Xianxi has an upward trend, daily minimum temperatures of Dali, Nantou and Xianxi have an upward trend, and diurnal temperature ranges of Dali, Nantou and Xianxi have a downward trend. It implies the possibility of global warming effect. Note that the upward trend of daily maximum temperature of Xianxi suggests a global warming effect rather than an urban heat island effect due to least-developed status. Therefore, we must be cautious when we choose Xianxi to be a rural station to analyze the urban-rural difference of temperature with Dali. On the contrary, Nantou, in the inland site, seems to be a better rural station due to a downward trend of daily maximum temperature. The comparison between Dali and Nantou shows that the urban-rural temperature differences are larger in the daily maximum temperature and diurnal temperature range than daily minimum and daily average temperatures, larger in the summer than in the winter, and larger in the nighttime than in the daytime.
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