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研究生:劉玲伶
研究生(外文):Lin-Lin Liu
論文名稱:以海研二號CTD觀測資料分析宜蘭灣1994 ~ 2010年分層水溫變化
論文名稱(外文):Analysis of sublayer temperature changes in I-Lan Bay during 1994-2010 using CTD data obtained from Ocean Researcher II
指導教授:呂學榮
指導教授(外文):Hsueh-Jung Lu
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:環境生物與漁業科學學系
學門:農業科學學門
學類:漁業學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:89
中文關鍵詞:宜蘭灣表水溫溫深鹽儀聖嬰/南方震盪海洋數據視圖
外文關鍵詞:I-Lan BaySSTCTDENSOOcean Data View
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本研究嘗試以CTD觀測資料分析海洋環境的長期變化與氣候變異的關係,選定海研二號歷年探測密度頗高的宜蘭灣為實驗場,透過ODV的彙整與繪圖功能處理1994~2010年春季(3~5月)的CTD原始觀測資料,希望瞭解實測水文資料變動情形及其如何反映近期的聖嬰與反聖嬰事件。經由分析結果證實了以下幾點:
1. 1994~2010年期間宜蘭灣附近海域之衛星遙測表水溫(SST)呈現逐年上升趨勢,春季與冬季的趨勢最為明顯。水溫上升過程中,宜蘭灣水溫會受到聖嬰與反聖嬰影響而產生波動。宜蘭灣海表溫距平值(SSTA)與海洋聖嬰指數(ONI)之時序列交叉相關分析顯示,SSTA與ONI有顯著相關性,但時間上有落差。
2. CTD觀測資料顯示上層水溫與SST相同有逐年趨勢,聖嬰時期海溫明顯上升,反聖嬰產生時則會下降。較深水層(100 m以深)則無此現象,100~250m水層為溫度變化快速並漸趨於穩定的躍溫層,以及300m以深的深層水域,其溫度變化值差距不大。
3. 從各年垂直水溫斷面及定點垂直水溫之經時變化觀察近岸與外洋水溫變動情形顯示,近岸海域之年間差異較外洋來得大。距離海岸20km以外的海域,終年受到黑潮高溫、高鹽特性的影響,受到氣候短期變異的影響較近岸區來得小。
本研究以長達17年CTD觀測數據分析宜蘭灣的水文變動,初步探討了氣候變異對表層及次表層水溫變動的影響,也證實了ODV的資料彙整與繪圖功能可有效展現測站的水溫變動訊息,未來可參考此模式,對其他海域的水層進行解析探究。受限於目前研究船的CTD觀測數據以個別型研究計畫為主,不論在時間與空間上均為非系統性採樣,作為長期性的海洋生態系監測有其不足,未來應可在特定樣區,強制規定CTD投放任務,以建立長期而穩定的海洋觀測資料庫。

In this study, we tried to analyze the relationship between local ocean environmental change and climatic variability using data obtained from long term CTD observation. I-Lan Bay with high coverage of surveys by the Ocean Researcher II was selected as the target area of this study. We used a professional software, Ocean Data View (ODV), to integrate and process the CTD data of the spring seasons (March ~ May) during 1994-2010, with which the in situ oceanographic fluctuation in relation to El Niño and La Niña events were observed. The followings are the major results:
1. The monthly sea surface temperature (SST) in I-Lan Bay obtained from satellite remote sensing indicated a rising trend year by year during 1994~2010, especially for spring and winter seasons. During the rising process, El Niño and La Niña events may cause variability. The cross-correlation analysis between SST anomaly in I-Lan Bay and Ocean El Niño Index (ONI) implied that the SSTA were correlated to ONI however the response of SSTA were with time lag.
2. The trends of temperature in upper sub-layers revealed by CTD data were consistent with SST, going up and down during El Niño and La Niña, respectively. However, such phenomena were not found in the depths below 100 m. Both in the depths of 100-250m, where temperature changed rapidly and became stable gradually, and in the depths below 300m, the changes of temperature were relatively minor.

3. According to the temperature contours of fixed section and fixed areas against time, the temperature variability in coastal stations were much higher than those of open ocean stations. In those stations of more than 20km off the coast, being affected all year around by Kuroshio featured high temperature and high salt, the temperature did not change a lot by short-term climatic variability (El Niño and La Niña).
We compiled 17-year CTD data in I-Lan Bay and conducted a fundamental analysis of fluctuation characteristics in sub surface ocean environment as well as its relationship with climatic variability. It has been confirmed that ODV is a useful tool for data compilation and graphs generation for exploring information of CTD data. The process procedure can be applied in other areas. However, the major constraint of CTD availability is from the present cruise arrangement scheme. It is very difficult to have a long-term systematic sampling data in space and time. We strongly suggest that a fixed monitoring area should be identified, where compulsory CTD deployment has to be carried out in every single cruise, then a long-term, more stable and reliable database of oceanographic observation can be established。



摘要 I
Abstract III
目錄 V
表目錄 VI
圖目錄 VII
壹、 前言 1
貳、 材料與方法 7
一、資料來源 7
二、資料彙整與篩選 10
三、資料分析 12
參、 結果 17
一、衛星遙測歷年表水溫變化分析 17
二、歷年CTD的水文資料觀測 19
三、ONI與分層水溫的關係 21
肆、 討論與結論 25
一、水溫長期上升趨勢與短期變異 26
二、海流對海溫變化的影響 27
三、其他觀測參數變動的探討 29
四、結論與展望 31
參考文獻 33


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