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研究生:謝凱倫
研究生(外文):Xie, Kai-Lun
論文名稱:利用福衛七號觀測2022年東加火山噴發所引起之大氣波動傳播特性
論文名稱(外文):Observation of atmospheric wave propagation triggered by the 2022 Tonga Volcanic Eruption using FORMOSAT-7/COSMIC-2
指導教授:陳佳宏陳佳宏引用關係
指導教授(外文):Chen, Chia-Hung
口試委員:林映岑孫楊軼
口試日期:2023-06-16
學位類別:碩士
校院名稱:國立成功大學
系所名稱:地球科學系
學門:自然科學學門
學類:地球科學學類
論文種類:學術論文
論文出版年:2023
畢業學年度:111
語文別:中文
論文頁數:67
中文關鍵詞:東加火山福衛七號離子速度儀地面氣壓小波分析海潮計帶通濾波器
外文關鍵詞:Tonga VolcanoFORMOSAT-7/COSMIC-2 SatelliteIon Velocity MeterGround-level Atmospheric PressureWavelet AnalysisTidal GaugeBandpass Filter
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西元2022年1月15日當地時間17:14:45 LT東加火山大規模噴發,造成多人死亡及大規模破壞,是30年來最嚴重的一次火山噴發事件。次此的火山噴發能量以多種波動的方式在地球上傳遞,次聲波、Lamb waves、聲波、重力波、海嘯……等,其中造成的大氣波動在24小時內傳遞到全世界。
本研究主要在探討2022年東加火山噴發對不同高度所引起之大氣波動傳播特性,使用福衛七號IVM現地量測電離層電漿資料、福衛七號掩星電漿垂直剖面濃度(ionPrf)、對流層水氣壓垂直剖面(wetPf2)、對流層氣溫垂直剖面(atmPrf)、地面氣壓站和海潮計資料,對其進行觀測和分析。福衛七號IVM觀測結果顯示,東加火山的噴發對衛星高度550公里的電漿濃度產生顯著變化,並且有往西傳播的趨勢。同時,東加火山噴發也對地面氣壓和海潮計的觀測值造成明顯的波動。為了更深入地瞭解東加火山噴發後大氣波動傳播的特性,本研究利用福衛七號電離層掩星反演剖面資料(ionPrf)與大氣層掩星反演資料(atmPrf,wetPf2),嘗試尋找東加火山噴發前後大氣波動向上傳播的證據。接著,進一步利用小波分析法(wavelet)和帶通濾波器(bandpass filter)等濾波方法對資料進行頻譜分析,結果表明這些波動具有明顯的週期變化。根據分析結果,本研究提出了東加火山噴發後大氣波傳播的可能方式,推測火山噴發產生的氣壓擾動主要是以水平方向傳播為主,然後再影響海平面高度變化以及垂直傳遞影響到電離層電漿變化,觀測資料顯示上、下層耦合的證據。這些結果對於深入瞭解東加火山噴發及其對周圍環境的影響具有重要的意義。
On January 15, 2022, a major volcanic eruption occurred in Tonga, resulting in significant casualties and widespread destruction. This study focuses on investigating the propagation characteristics of atmospheric waves generated by the eruption at different altitudes. Using measurements from the FORMOSAT-7/COSMIC-2 satellite, including in-situ ionospheric plasma density and profiles (IVM and ionPrf), water vapor profiles (wetPf2), and atmospheric temperature profiles (atmPrf), together with surface air pressure and tidal gauge data, this study analyzes the effects of the Tonga volcano eruption on the atmosphere. The analysis, including wavelet analysis and bandpass filtering, reveals distinct periodic variations in the observed waves. It is proposed that the air pressure waves generated by the eruption propagated horizontally, induceding an in-situ sea level change, and then propagated vertically to disturb the ionospheric plasma. These results contribute to a better understanding of the 2022 Tonga volcanic eruption and its environmental impacts.
第一章 緒論 1
1.1 東加火山 1
1.2 前人文獻 1
1.3 研究動機 7
第二章 資料來源 9
2.1 福爾摩沙衛星七號任務 9
2.2 地面氣壓觀測站 11
2.3 海潮計 12
第三章 研究方法 15
3.1 小波分析 15
3.2 帶通濾波器 17
第四章 研究成果與討論 20
4.1海潮計研究成果與討論 20
4.2 美國地面氣壓觀測站研究成果與討論 29
4.3 福衛七號IVM研究成果與討論 36
4.4 利用福衛七號掩星剖面資料證明本研究推論 48
第五章 結論 60
參考文獻 61
附錄 64
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吳祚任.東加海嘯為何那樣?物理專文 - 新聞訊息, 2022.
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