| 研究生: |
陸勁華 CHIN-HWA LU |
|---|---|
| 論文名稱: |
重力波與背景風場之關係 The relationships between gravity wave and background wind |
| 指導教授: |
郭富雄
FU-SHONG KUO |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
地球科學學院 - 太空科學研究所 Graduate Institute of Space Science |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 105 |
| 中文關鍵詞: | 重力波 、相速度 、群速與相速追跡法 、群速度 |
| 外文關鍵詞: | Rapid Communication Physical parameters of gravi, group velocity, phase velocity, gravity wave |
| 相關次數: | 點閱:13 下載:0 |
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以雷達觀測大氣時,特別是在觀測電離層時,常有許多的觀測者會將各層的回波強度以時間序列之方式,繪製成時間與高度關係之回波強度灰度圖(Range-Time-Intensity ,簡稱RTI )從這種圖中可以很容易地看出波動的活躍狀況。而重力波常會因大氣的不穩定像是雷雨、鋒面、對流、風切等……而被激發,藉由RTI圖可輕易查出波動活躍的好處,並與雷達觀測之垂直風速變化相比較、研究。藉由與其他觀測方法的比較來顯示本論文所使用方法的好處,且由RTI圖中很快可以看出波動的活躍狀況 並求出相關的物理性質,例如:重力波的垂直群速度與垂直相速度以及週期。經由RTI圖也發現了風噴流(jet stream)活動的重要性為它是重力波的激發源,並發現了垂直群速度與相速度方向相同的重力波案例,尤其是在背景風速很強時或風切很大時更是明顯。
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