本文利用ORIII-1192航次於2006年11月24-26日於高屏海底峽谷所採取之水漾進行放射性核種210Pb與210Po分析，並參考CR-634航次(2000年6月21至7月20日)所收集到的沉降顆粒，以及CR-642 (2000年7月21日)、CR-696 (2001年4月7日)航次於高屏峽谷所採取的岩心等210Pb與210Po的資料，探討高屏峽谷的核種分佈型態與顆粒的傳輸過程。水體中核種的活度分佈於高屏峽谷可分成兩種型態:一為峽谷前端靠近河口測站，受控於顆粒的清除作用；另一為峽谷外側測站具有大洋性質，溶解態核種活度較高。而沉降顆粒核種活度隨深度遞減，此現象與一般邊緣海的研究結果相似，可能為底部收集器顆粒受到表層沉積物低活度的顆粒稀釋。而表層沉積物由峽谷前端至外側的210Pb與210Po的分佈，每根岩心所得到的整個剖面結果都是210Pb與210Po未達到放射性平衡。一般只在表層沉積物發現這樣的特徵，此結果顯示整個高屏峽谷顆粒的沉積狀態並不穩定且長期受到擾動，影響的範圍深達40-50公分。綜合以上結果，高屏峽谷水體、沉降顆粒以及沉積物中的210Po相對於210Pb都是不足的，因此利用盒子模式估算核種於高屏峽谷的滯留時間時，需納入水平傳輸的影響。高屏陸棚水層100公尺內的溶解態、顆粒態210Po滯留時間分別為2.1天、7.0天，總量210Pb為3.8天。

Abstract
The purposes of this study are to understand the variations of the particulate and dissolved 210Pb and 210Po profiles in the water column of Gaoping Submarine Canyon(GSC) and to compare the distributions of the two nuclides in settling particles and sediments. Different types of samples taken in this area were analyzed for 210Pb and 210Po in order to understand processes involved in the particulate transport. Seawater samples were collected from Ocean Researcher III Cruise (ORIII-1192 in Nov, 2006). Sediment trap was deployed on Jun 21, 2000 and recovered on Jul 20, 2000 (ORIII-634). Sediments cores collected from ORIII-642 on Jul 21, 2000 (Core A-B) and ORIII-696 on Apr 7, 2001 (Core D-F) using multicorer.
The profiles of 210Pb and 210Po in water column could be divided into two types one is estuarine and the other is oceanic. The profiles of dissolved nuclides in estuarine stations (CW1 to 3) are lower than in the oceanic stations (CW4-5). Because stations CW1 to 3 are controlled by large amount of terrigenous particles, scavenging in the three stations is quite obvious.
The nuclide activities of the settling particles decrease with depth, probably due to dilution by resuspended surface sediment of lower activities, similar to observations in this study area. The downcore distributions of 210Pb and 210Po show clearly disequilibria between the two nuclides and suggested that sediment deposited in GSC has been disturbed down to 40-50 cm deep. All the data indicate the 210Po in the water column and in the settling particles as well as in the surface sediments is strongly deficient relative to its parent, 210Pb. Using a box-model and considering the influence of horizontal transports, we may calculate the residence times of 210Po in the 100m water layer in the GSC, to be 2.1d for the dissolved phase and 7.0 d for the particulate phase with a total 210Pb residence time is 3.8d.

目 錄
致謝……………………………………………………….I
中文摘要………………………………………………….II
英文摘要………………………………………………….III
目錄……………………………………………………….V
圖目錄…………………………………………………….VII
表目錄…………………………………………………….X
第一章
緒論……………………………………………………….1
1.1前言………………………………………………….1
1.2前人研究…………………………………………….7
1.3研究目的…………………………………………….9
第二章
研究區域……………………………………………….11
2.1研究區域背景…………………………………….11
2.2採樣地點………………………………………….18
2.3核種分析………………………………………….18
2.4樣品中210Pb與210Po活度的計算方式……… 26
第三章
結果與討論…………………………………………… 30
3.1溶解態與顆粒態之210Pb及210Pb活性分佈……………….30
3.2沉降顆粒中210Pb及210Po通量分佈與時序變化……… 61
3.3沉積物中210Pb與210Po的活性分佈……………………………… 73
3.4 210Pb活度與通量的控制因素 …………………………………… 85
3.5 210Pb budget探討………………………………………………… 88
第四章
結論…………………………………………………… 89
第五章
參考文獻……………………………………………….90

第五章 參考文獻
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