| 英文摘要 |
The ground observations at National Changhua University of Education (NCUE), one of the stations collaborated with the Central Weather Bureau (CWB) has been automatically operated since November 1997. Based on the observations, the climatology of diurnal cycle, seasonal cycle and extreme weather events have been examined in this study. According to the analysis, the annual average of sunshine duration is about 5.6 hours. The surface air temperature and the relative humidity is 23.4℃ and 72%, respectively. For the precipitation, the total number of rainy days at station is about 84 days, while the total annual rainfall is 1,145mm. The major wet seasons including Meiyu season (from May to June), and typhoon season (from July to September) mainly occur in summer. The rainfall during these periods accounts for 76% of the total rainfall over a year. For the diurnal fluctuation, the surface pressure has a significantly semi-diurnal pattern with the maxima around 10 A.M. and 10 P.M. and with minima near 4 A.M. and 4 P.M. as well. The highest air temperature may occur between 11A.M. and 2:00 P.M., while the lowest air temperature usually occurs between 5:00 and 6:00 A.M. For the wind field analysis, the wind speed is greater in daytime than that in nighttime. The prevailing wind direction is also found a tendency to between north and northwest. According to the observations in the past fifteen years, the extreme weather events are mainly caused by typhoon and strong Siberian high. Due to the interaction with these systems, the highest amounts of daily and hourly rainfall generally reach 360mm and 68mm, respectively. Meanwhile, the maximum and minimum temperatures are about 38.8℃ and 6.7℃ during the events. |
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