臺灣博碩士論文加值系統

本研究係利用衛星遙測的風應力資料，觀測太平洋赤道海域風場的變化。經由風應力年變化經驗正交函數分析，其中第一主成份顯示風應力變化主要受到行星風系的影響，使得赤道風場呈現西南與西北向。第二主成分顯示靠近陸地部分的風應力變化比較大，主要是受到陸地氣壓季節性的影響。而經由風場跨年變化經驗正交函數分析，其中第一主成份顯示在菲律賓外海暖池上的風應力有較大變化，在1998年1月變化最為顯著，主要受到西風暴發影響。第二主成分顯示太平洋赤道海域風應力呈現急劇不規則變化，在1997年6月至1998年4月間變化最明顯，主要是受到聖嬰發生過程中暖池東移的轉變影響，致使風應力也隨暖池移動而改變。

This study uses wind stress derived from satellite scatterometer data to observe the variation of wind fields in the Equatorial Pacific Ocean. From the vector empirical orthogonal function (VEOF) analysis, the results indicate that the first VEOF shows the feature of planetary wind system and the second VEOF represents the seasonal change nearby land. We also removed the annual signal from the dataset and calculated the interannual VEOF. The first interannual VEOF represents the westerly winds burst in January 1998 over the western Pacific warm pool and the second interannual VEOF is El Nino-Southern Oscillation (ENSO) related mode. The spatial mode of the second interannual VEOF reflects the response of the tropical and extra-tropical winds to ENSO events. It changes obviously during June 1997 - April 1998.

目 錄
摘要…………………………………………………..……….………… I
Abstract………………………………………………………….………II
目錄……………………………………………….…….………………III
表目錄………………………………………………….………….…….V
圖目錄……………………………………….………………….………VI
第一章 前言…………………………………………………..…………1
1.1研究動機與目的…………………………………………………..1
1.2聖嬰與反聖嬰………………………………………..……………2
1.3衛星遙測風場原理……………………………………….……….4
1.4研究區域概述………………………………………..……………5
第二章 研究資料與研究方法……………………………..…………..6
2-1研究資料…………………………………………..….……….…..6
2-1.1風場資料來源…………………………………..…….………6
2-1.2風場資料前處理………………………………..…….………6
2-1.3風場資料振幅調整………………………………..…….……7
2-1.4聖嬰與反聖嬰時期海表溫資料來源…………..……….……8
2-2研究方法……………………………………………….…….……8
2-2.1月平均風應力……………………………………..…….……8
2-2.2向量經驗正交函數（VEOF）…..………………….………9
第三章 結果與討論………………………….…………………..………16
3-1月平均風應力分析結果……………………………......….………16
3-2向量經驗正交函數分析結果……….………….……..…...………16
3-2.1年變化經驗正交函數分析結果………….……….......………16
3-2.2跨年變化經驗正交函數分析結果……………….…..….……18
3-2.3 Nino3.4指標與風場跨年變化結果比較………...……...……20
第四章 結論與展望……………………………………...……...……21
參考文獻……………………………………………………..………….23

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