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標題: | 台北都會區午後雷陣雨週間變化 Weekly Variations of Summertime Thunderstorms in the Urban Area of Taipei |
作者: | Shih-Chieh Wang 王世傑 |
指導教授: | 游政谷(Cheng-Ku Yu) |
關鍵字: | 週間變化,都會區,台北盆地,降雨強度,懸浮微粒,細懸浮微粒,五分山雷達,午後熱對流,弱綜觀環境, weekly variation,urban area,Taipei basin,rainfall intensity,PM10,PM2.5,RCWF,thunderstorm,weak synoptic forcing, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 本研究利用氣象局與環保署地面觀測站氣象參數資料,針對台北盆地1999~2015年6~8月弱綜觀環境下之午後熱對流進行週間變化分析。結果顯示盆地內雨量站平均降雨強度的最大值發生在週三,次大值則發生在週五,而最小值則出現在週一或週六,而整體而言是週間的平均降雨強度大於週末的平均降雨強度,而雷達觀測分析也顯示出一致性的結果。
為了瞭解台北盆地降雨週間變化的可能原因,本研究也針對懸浮微粒與熱動力參數進行週間分析。結果顯示PM10與PM2.5具有明顯的週間變化,其平均粒子濃度最大值發生在週四或週三,最小值在週日,而週三具有最小的靜力穩定度與最大的對流不穩定度。然而,溫度、相對濕度、混合比、海風強度與垂直風切之週間變化不明顯。從這些分析結果隱含著懸浮微粒可能對於降雨週間變化較有貢獻。 另外,當不考量弱綜觀環境的天數進行雨量週間分析,發現到平均降雨強度就不存在週間變化,此一點確定了在弱綜觀環境下的午後熱對流才具有降雨週間變化。 The study utilizes Central Weather Bureau (CWB) surface observations and Environmental Protection Administration (EPA) observations hourly meteorological parameters to analyze weekly variations of precipitation associated with thunderstorms in the Taipei urban area between Jun. and Aug. of 1999-2015 during the weak synoptic forcing. The result indicates that the maximum of rainfall intensity is on Wednesday and secondary maximum of rainfall intensity is on Friday whereas the minimum of rainfall intensity is on Monday or Saturday. On the whole, the rainfall intensity is stronger on weekday than weekend. Moreover, the rainfall intensity derived from radar measurements also indicates consistent results. To understand the causes of the weekly variations of precipitation associated with thunderstorms in the Taipei urban area, the study analyzes aerosols and thermodynamic and dynamic meteorological parameters. The weekly variations of PM10 and PM2.5 also exist. However, the largest concentrations of PM10 and PM2.5 are found on Thursday or Wednesday and the smallest concentrations are found on Sunday. The lowest static stability is found on Wednesday, but the highest convective instability is found on Wednesday. Nevertheless, the weekly variations of temperature, relative humidity, mixing ratio, sea breeze, vertical wind shear are not significant. Therefore, the result implies that aerosols have stronger impact on the weekly variation of rainfall than other meteorological parameters. Finally, the weekly variations disappear if analysis is performed for all days between Jun. and Aug. of 1999-2015. This result indicates that the weekly variation of precipitation associated with thunderstorms exists only during the weak synoptic forcing. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70137 |
DOI: | 10.6342/NTU201704227 |
全文授權: | 有償授權 |
顯示於系所單位: | 大氣科學系 |
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