分析46年間日長變化的小波頻譜以及彈性地球對長期海潮的反應

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鄒致瑋(Chih-Wei Chou) 查詢紙本館藏

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地球物理研究所

論文名稱

分析46年間日長變化的小波頻譜以及彈性地球對長期海潮的反應
(Wavelet spectral analysis and the elastic earth’s response of long-period tides in 46-years length of day)

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摘要(中)

基於角動量守恆的原理，地球自轉的速度會隨著地表及地球內部質量的流動與分布改變而擾動，可藉由分析日長變化量 (variation in length of day，ΔLOD) 找出改變地球轉速的地球物理現象。本研究利用累積近50年的觀測資料，目的是想得到比先前的研究更精確的結果，以及觀察年際性週期的訊號。本文使用National Centers for Environmental Prediction (NCEP) 提供的1962-2008年LOD做以下兩種研究：第一是計算長週期潮汐相對於彈性地球的zonal response coefficient (κ值) 並與前人做比較。結果得到κ值比較大，範圍在0.315~0.34之間，標準差更小。表示在重力的影響之下，海洋對彈性地球的影響比目前的模式所得更大。第二是計算小波頻譜圖，解釋不同週期的訊息。顯示出El Nino-Southern Oscillation (ENSO)在ΔLOD之中有6年的週期變化相當規律，暗示著ENSO可能存在與其他自然現象某些關聯，進而影響了本身各年份的強弱。此外本文在小波頻譜上發現新的地球物理訊號，週期大約是13~16年，有待此後更多的研究來證明之。

摘要(英)

On the basis of conservation of angular momentum, the rotational rate of the earth varies with surface and inner earth’s mass fluid and redistribution. Some geophysical phenomena which change earth’s rotational speed will be discovered by analyzing the variation in length of day (ΔLOD). In this study, nearly 50 years ΔLOD data provided from National Centers for Environmental Prediction (NCEP) are used to calculate more accurate estimates and to observe annual signals. This work has two parts. The first part is to calculate zonal response coefficient (κ) for long-period tides relative to the elastic earth and compare with the result of previous studies. The result κ of this study is larger, between 0.315-0.34, and has smaller standard deviation. It means the ocean impacts the elastic earth greater than ocean models at present days. The second part is revealing signals of different periods with wavelet spectral analysis. It shows that the period of El Nino-Southern Oscillation (ENSO) is very regular. It implies that ENSO may have some association with other natural phenomena, which affect their strength sometimes. In addition, this work finds a new geophysics signal which has a period about 13 to 16 years, and more research is necessary to prove that.

關鍵字(中)

★ 長週期潮汐
★ 長期海潮
★ 小波頻譜
★ 日長變化

關鍵字(英)

★ length of day
★ wavelet spectral analysis
★ long-period tides
★ zonal response coefficient

論文目次

中文摘要　i
英文摘要　ii
目錄　iii
圖目　iv
表目　iv
第一章　緒論　1
1.1　研究動機　1
1.2　文獻回顧　2
第二章　研究原理及方法　5
2.1　日長變化中海潮的效應　5
2.2　小波頻譜分析　8
第三章　資料來源　9
3.1　日長量　LOD　9
3.2　大氣角動量　AAM　10
第四章　資料處理　11
4.1　大氣角動量　AAM　12
4.2　季節項、年際項的去除　14
4.3　計算κ值　15
4.4　小波頻譜分析　17
第五章　結果與討論　18
5.1　κ值　18
5.2　小波頻譜圖　21
第六章　結論　30
參考文獻　31

參考文獻

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指導教授

趙丰(Benjamin Fong Chao)

審核日期

2010-7-23

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