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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 陳維婷(Wei-Ting Chen) | |
| dc.contributor.author | Tzu-Han Hsu | en |
| dc.contributor.author | 徐子涵 | zh_TW |
| dc.date.accessioned | 2022-11-24T03:04:44Z | - |
| dc.date.available | 2021-07-08 | |
| dc.date.available | 2022-11-24T03:04:44Z | - |
| dc.date.copyright | 2021-07-08 | |
| dc.date.issued | 2021 | |
| dc.date.submitted | 2021-06-22 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/80339 | - |
| dc.description.abstract | "本研究使用觀測資料和高解析模式，探討細懸浮微粒濃度(fine particulate matter, PM2.5)的空間分布在台灣冬春季連續弱綜觀天氣下的變化。 根據台灣天氣型態資料庫、地面降雨和位於台灣東南風場下的上游測站石垣島探空資料，在2008至2019年台灣冬春季中，有302天被定義為弱綜觀天氣型態。另外，將台灣各個地面空氣品質測站的日均PM2.5濃度與各個測站該年冬春季均PM2.5濃度的比值定義為各測站的PM2.5比率，再計算弱綜觀天氣的日子下各個地面測站PM2.5比率大於1的頻率，此無因次頻率指標(無單位)代表各個測站在弱綜觀天氣下PM2.5相較於季節背景的加強程度。在弱綜觀天氣下PM2.5被增強的高頻率(大於0.65)測站位置，和背景東南風場下的背風側弱風區域相符。在連續弱綜觀天氣的日子下，台灣區域綜觀風場會由東南東風向轉為南南東風向，而位於背風側測站的頻率指標也會提高至大於0.8；此外，在連續弱綜觀天氣下，台北盆地PM2.5加強的頻率會在第二天大幅增加。觀測分析結果顯示連續弱綜觀日在台灣北部的日均PM2.5相較於各個測站冬春季背景有最顯著的增加；此外，在台灣複雜地形下，上游風場的風向改變對於背風側局地環流有重要的影響，並且會進一步影響粒狀汙染物在背風側的分布和傳送方向。 為了進一步探討背景風場的方向轉移對細粒狀汙染物傳送的影響，我們利用具有高解析度台灣地形的渦度向量模式，在兩組不同風向110度(東南東風)和140度(南南東風) 的背景風場下，以被動示蹤物(tracer) 模擬台灣重要人為排放源的的局地傳送。兩組實驗皆顯示白天台灣中北部地區的氣流由背風渦漩所引導的西南風場主導，因此從中部排放的被動示蹤物容易傳向台灣北部陸地，並且多數汙染物會局限在背風渦漩和山區之間。此外，南南東風的模擬中，台灣西北端背風渦漩的向北移動能在背風側引發更大範圍的西南回流，將被動示蹤物傳至更北的地區。整體而言，數值模擬結果顯示台灣複雜地形背風側渦漩的位置和移動，對上游風向十分敏感，並且對汙染物的向北傳送扮演著重要角色。" | zh_TW |
| dc.description.provenance | Made available in DSpace on 2022-11-24T03:04:44Z (GMT). No. of bitstreams: 1 U0001-2106202113370400.pdf: 3453276 bytes, checksum: eb2b3824e9ab96ab1f79bb5a9f87b99e (MD5) Previous issue date: 2021 | en |
| dc.description.tableofcontents | 誌謝 i 中文摘要 ii Abstract iv Contents vii Figure Captions viii Table Captions xi 1. Introduction 1 2. Method 7 2.1 Meteorological and PM2.5 Data 7 2.2 Definition of Weak Synoptic Weather Days 7 2.3 The Enhanced PM2.5 ratio index 9 2.4 Model Description and Experiment Setup 9 3 Results 13 3.1 The Enhanced PM2.5 ratio index and Wind Flow under Weak Synoptic Weather Days 13 3.2 The Pollutant Enhancement in Consecutive Weak Synoptic Weather Days 14 3.3 Numerical Simulations 17 4 Discussion 20 4.1 The Quantification of Mountain Blocking Effect and Lee Vortices 20 4.2 The Vertical Distribution of the Particulate Pollution 21 5 Conclusion and Future Work 24 References 26 Figures 32 Tables 43 | |
| dc.language.iso | en | |
| dc.subject | 細懸浮微粒 | zh_TW |
| dc.subject | 局部環流 | zh_TW |
| dc.subject | 複雜地形 | zh_TW |
| dc.subject | local circulation | en |
| dc.subject | mountainous terrain | en |
| dc.subject | fine particulate matter | en |
| dc.title | 冬春季連續弱綜觀天氣日細粒狀汙染物在台灣複雜地形背風側之分布 | zh_TW |
| dc.title | The Fine Particulate Pollutants Distribution over the Lee Side of Mountains in Taiwan under Consecutive Cold-season Weak Synoptic Days | en |
| dc.date.schoolyear | 109-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 吳健銘(Hsin-Tsai Liu),蘇世顥(Chih-Yang Tseng),Christopher Moseley | |
| dc.subject.keyword | 細懸浮微粒,局部環流,複雜地形, | zh_TW |
| dc.subject.keyword | fine particulate matter,local circulation,mountainous terrain, | en |
| dc.relation.page | 44 | |
| dc.identifier.doi | 10.6342/NTU202101073 | |
| dc.rights.note | 同意授權(限校園內公開) | |
| dc.date.accepted | 2021-06-22 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 大氣科學研究所 | zh_TW |
| 顯示於系所單位： | 大氣科學系 | |
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