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研究生:吳炫賦
研究生(外文):Shein-Fu Wu
論文名稱:南沖繩海槽深部水體顆粒體清除與傳輸作用:210Po/210Pb不平衡應用
論文名稱(外文):Particle Scavenging and Transport in the Deep Water of Southern Okinawa Trough: Application of 210Po/210Pb Disequilibria
指導教授:魏慶琳魏慶琳引用關係
指導教授(外文):Ching-Ling Wei
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:2000
畢業學年度:88
語文別:中文
論文頁數:96
中文關鍵詞:沖繩海槽顆粒體清除
外文關鍵詞:Okinawa TroughDisequilibria210Po/210PbScavenging
相關次數:
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摘 要
根據過去的研究資料顯示,沖繩海槽極有可能為東海陸棚上顆粒體向外輸出的管道、或是最後堆積之處。本研究利用了四條由陸棚向陸坡的大體積採樣測線,藉由消光度、總懸浮顆粒濃度的觀察,以及210Po/210Pb的活度分佈,觀察東海陸棚顆粒體對親顆粒性放射核種的清除機制。
利用CTD探針所得之消光度資料,配合所採顆粒相210Po、210Pb樣品所測得之總懸浮顆粒濃度,兩者之間有良好的關係,可由消光度的變化大體看出水體中顆粒體的分佈。東海陸棚的顆粒體,沿西北-東南方向測線皆有顆粒體輸出之擴散舌,而主要由基隆海谷與棉花峽谷兩條路徑輸出,北棉花峽谷輸出的現象較不強烈。
第7站在700-800 m的擴散舌輸出現象強烈,且輸出的顆粒所吸附210Pb的活度甚高,而同樣深度溶解相210Po的高值則是當地生物性顆粒分解所釋放造成。210Pb在深層水體750 m處的滯留時間只有0.24年,在底部滯留時間只有0.9年。第13站與第7站有相類似的情形但現象不若第7站強烈,深度700-800 m之間的擴散舌,輸入了富含210Pb的非生物性顆粒,210Pb的滯留時間也增長為1.4年。但此深度卻以生物性顆粒為主,清除210Po的能力很高,底層溶解相210Po滯留時間為0.1年,而顆粒相則只有0.02年。
第5站在深度1000 m左右有擴散舌的輸出,約600 m以上因其Log f值<0而以非生物性顆粒為主,且此站在210Po與210Pb單位顆粒質量的平均活度為最低。在600-800 m與1200-1550 m兩個水層的滯留時間平均約只有1.2年,顯示此站深層水體的210Pb清除現象強烈。210Po在底層水的高值,應為底部沉積物再懸浮作用的影響,亦有可能是受到海底火山之冷泉效應所造成。第15站在深度800 m擴散舌的輸出現象已不明顯,根據清除模式計算及Log f值結果,在1300-1600 m以清除210Po之生物性顆粒居多,此站為所有重點測站中單位顆粒質量平均活度最高、顆粒最小的。
第一章、前言………………………………………………………………………….1
1-1、天然放射性核種與生地化循環…………………………………………….…...1
1-2、226Ra/210Pb,210Pb/210Po放射不平衡現象在海洋清除作用上的應用…………1
1-3、研究動機及目的………………………………………………………………….6
第二章、實驗方法…………………………………………………………………….8
2-1、OR523航次介紹…………………………………………………………………8
2-1.1、研究區域…………………………………………………………………8
2-2、船上採樣工作…………………………………………………………………….8
2-3、實驗室前處理及樣品分析……………………………………………………….8
2-3.1、溶解相Po-210之分析…………………………………………………….8
2-3.2、顆粒相Po-210之樣品分析……………………………………………11
2-3.3、溶解相、顆粒相Pb-210……………………………………………… 11
2-4、樣品的計測與計測效率的校正……………………………………………… 11
2-5、推算樣品放射活度…………………………………………………………… 13
2-5.1、Po之活度計算………………………………………………………… 13
2-5.2、Pb之活度計算………………………………………………………… 13
第三章、實驗結果與討論…………………………………………………………. 15
3-1、研究區域水文特性…………………………………………………………… 15
3-1.1、溫、鹽分佈及變化………………………………………………………..15
3-1.2、總懸浮顆粒濃度與消光度變化…………………………………………23
3-1.3、南沖繩海槽的海底冷泉效應……………………………………………30
3-2、Po-210 與Pb-210的空間分佈…………………………………………………30
3-2.1、Po-210在表水中之變化…………………………………………………30
3-2.2、Pb-210在表水中之變化…………………………………………………35
3-2.3、Po-210在垂直水體中之變化……………………………………………35
3-2.4、Pb-210在垂直水體中之變化……………………………………………38
3-3、Pb-210 與Ra-226的不平衡現象………………………………………………39
3-4、Po-210 與Pb-210的不平衡現象………………………………………………45
3-5、Po-210 與Pb-210對顆粒體的親和特性………………………………………51
3-5.1、Po-210與Pb-210兩相間分佈係數Kd探討…………………………….54
3-6、Po-210、Pb-210之清除現象及模式計算………………………………………59
3-6.1、Pb-210之一維不可逆清除模式…………………………………………59
3-6.2、由Pb-210質量平衡探討東海陸棚與南沖繩海槽的物質傳輸………66
3-6.3、Pb-210在水體中之滯留時間……………….…………………………68
3-6.4、Po-210之一維不可逆清除模式及在水體之滯留時間…………………77
第四章、結論與研究方向……………………………………………………………89
4-1、結論…………………………………………………………………………….89
4-2、研究方向……………………………………………………………………….91
參考文獻……………………………………………………………………………..92
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