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研究生:黃鈴珺
論文名稱:彭佳嶼海域大氣懸浮微粒中金屬元素的濃度、來源及粒徑分佈研究
指導教授:林斐然林斐然引用關係
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:海洋研究所
學門:自然科學學門
學類:海洋科學學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:77
中文關鍵詞:彭佳嶼大氣懸浮微柆元素粒徑分佈沙塵暴
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本研究分析2000年1月至2001年7月在彭佳嶼島上採集的116個總量大氣懸浮微粒標本及10組粒徑分級標本,這些標本分別以石墨爐式及火焰式原子吸光儀分析其中的Al、Fe、Mn、Cu、Zn、Pb、Cd、Na、Mg、Ca及K等11個元素。
分析結果顯示,彭佳嶼海域大氣懸浮微粒中各元素的濃度變化十分劇烈,且有明顯的季節性變化,最高濃度出現在春、冬兩季,最低濃度則出現在夏季。春季時大氣中各元素的濃度較高主要是沙塵暴入侵所造成的。大氣中的微量元素依來源及粒徑可分為四類:Al、Fe和Mn以地殼來源為主,其中Al和Fe的質量平均直徑介於2.0∼3.0 μm,而Mn則介於1.0∼2.0 μm;Na、Mg和Ca以海水來源為主,其質量平均直徑介於4.0∼5.0 μm;K有地殼、海水及污染三重來源,其質量平均直徑為1.6 μm;Cu、Zn、Pb及Cd主要為污染來源,質量平均直徑小於1.0 μm。
K的三重來源所佔比例隨季節變化而有所不同:春、冬兩季,污染源的K所佔比例最高,海水源的K所佔比例最低;而夏、秋兩季則是海水源的K所佔比例最高,陸源的K所佔比例最低。
本文研究期間共偵測到12次大小不等的沙塵暴,其中2000年5次,2001年7次,沙暴發生時大氣懸浮微粒中Al的濃度皆高於3 μg/m3。2000年及2001年彭佳嶼海域大氣中Al的最高濃度分別為10.7 μg/m3及16.0 μg/m3。通量計算結果顯示春季時大氣中Al之沈降通量為全年沈降通量的7成以上,說明沙暴季節有相當可觀的陸源物質被傳輸並沈積至彭佳嶼海域。此外,在沙塵暴發生時,幾乎所有的元素其地殼源的比例均大幅提高。
目錄
摘要……………………………………………………………..Ⅰ
目錄…………………………………………………………….Ⅲ
圖目錄………………………………………………………….Ⅳ
表目錄………………………………………………………….Ⅴ
一、 前言
1-1研究背景………………………………………………1
1-2背景氣候概況…………………………………………3
二、研究方法
2-1標本的採集……………………………………………9
2-2標本的前處理………………………………………..10
2-3標本的消化處理……………………………………..11
2-4儀器分析……………………………………………..12
三、結果與討論
3-1分析方法的準確度及精密度……………………… 13
3-2懸浮微粒中元素的濃度分佈…………………… 14
3-3懸浮微粒中元素的來源
3-3.1元素間的相關性…………………………….21
3-3.2富集因子分析……………………………….24
3-3.3元素的粒徑分佈…………………………….31
3-3.4各粒徑中元素之EF值…………………….37
3-4綜論元素之濃度變化與來源……………………… 40
3-5沈降通量的估算…………………………………….47
四、結論………………………………………………………. 52
五、誌謝……………………………………………………… 54
六、參考文獻…………………………………………………..55
七、附錄………………………………………………………..63
六、參考文獻
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