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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62956完整後設資料紀錄
| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 魏慶琳(Ching-Ling Wei) | |
| dc.contributor.author | Tzu-Wen Huang | en |
| dc.contributor.author | 黃資雯 | zh_TW |
| dc.date.accessioned | 2021-06-16T16:16:22Z | - |
| dc.date.available | 2013-02-21 | |
| dc.date.copyright | 2013-02-21 | |
| dc.date.issued | 2013 | |
| dc.date.submitted | 2013-02-05 | |
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Geochimica Et Cosmochimica Acta 58, 1795-1811. Wei, C.L., Tsai, J.R., Wen, L.S., Pai, S.C., Tai, J.H., 2009b. Nearshore scavenging phenomenon elucidated by 234Th/238U disequilibrium in the coastal waters off Western Taiwan. Journal of Oceanography 65, 137-150. Whitfield, M., Turner, D.R., 1979. Water-rock partition-coefficients and the composition of seawater and river water. Nature 278, 132-137. 楊明德, 2001. 台灣北部地區大氣Pb-210沈降通量. 台灣大學碩士論文, pp 61. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62956 | - |
| dc.description.abstract | 本論文利用海研二號1345航次於2006年4月17~20日採集台灣西北淡水河口近岸海域表水樣本，量測溶解態和顆粒態234Th、210Pb及210Po三核種於表水的活度，探討和比較此三核種於近岸的清除作用，並佐以葉綠素(Chlorophyll-a)、營養鹽 (NO2、NO3、PO4、SiO2、NH3) 、顆粒有機碳 (POC) 及其他化學參數，比較三核種的生地化循環和行為，並以這三核種作為顆粒體的示蹤劑，探討親顆粒微量元素和顆粒有機碳的通量。
於研究海域， 234Th活度受到顆粒清除作用的影響相對於母核種238U的活度，呈現不足的狀態；與其他研究不同，210Pb於研究海域的活度低於母核種226Ra活度，可能為226Ra於近岸的活度高於SiO2估算值使然； 210Po與210Pb活度於顆粒相及溶解相的比值於此研究區域皆大於1， 顯示此區域210Po再礦化作用相對於母核種210Pb有過剩的現象。 本論文以清除模式估算台灣西北近岸海域234Th、210Pb及210Po的移除通量及滯留時間。234Th於此研究區域的滯留時間範圍為3~15天，210Pb於此研究區域的滯留時間範圍為1~3天，210Po於此的滯留時間範圍則為13~40天。經過清除模式得到的234Th、210Pb及210Po三核種在台灣西北近岸的移除通量，分別為1093 ± 61 dpm/m2/d、755 ± 2 dpm/m2/d、74 ± 1 dpm/m2/d。以234Th、210Po作為海洋中顆粒有機碳的示蹤劑，運算出的顆粒有機碳輸出通量為6.9~33.4 mmol/m2/d。 | zh_TW |
| dc.description.abstract | Large-volume surface seawater samples were collected during 17~20 April 2006 (OR2-1345) in the nearshore waters off northwestern Taiwan for the determinations of dissolved and particulate 234Th, 210Pb, and 210Po. Along with the radionuclides, data of chlorophyll-a, nutrients, particulate organic carbon, and other hydrographic parameters were also determined. The aim of this study is to compare the geochemical behaviors of the three particle-reactive radionuclides and, using the three radionulides as particle tracers, to estimate the removal flux of particulate organic carbon in the nearshore water.
In the study area, 234Th is deficient with respect to 238U due to enhanced particle scavenging. Different from most of the literatures, 210Pb is lower than 226Ra, which may be caused by inaccurate estimation of 226Ra activity by the SiO2-226Ra relationship. Activity ratio of 210Po to 210Pb ratios is > 1 in both dissolved and particulate phases, demonstrating regeneration of 210Po in the nearshore environment. Removal fluxes and residence times of 234Th, 210Pb, and 210Po in the nearshore waters off northwestern Taiwan were estimated by the scavenging model. The residence time ranges from 3 to 15 days, from 1 to 3 days, and from 13 to 40 days, for for 234Th, 210Pb, and 210Po, respectively. The removal fluxes of 234Th, 210Pb, and 210Po are 1093 ± 61 dpm/m2/d, 755 ± 2 dpm/m2/d, and 74 ± 1 dpm/m2/d, respectively. Using 234Th and 210Po as proxies of particulate organic carbon, the removal flux of POC ranges from 6.9 to 33.4 mmol/m2/d in the nearshore waters off northwestern Taiwan. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T16:16:22Z (GMT). No. of bitstreams: 1 ntu-102-R99241406-1.pdf: 3201029 bytes, checksum: b3ef06b3e57a7267a02ce94b35ec7897 (MD5) Previous issue date: 2013 | en |
| dc.description.tableofcontents | 口試委員會審定書 I
致謝 II 摘要 III Abstract IV 目次 V 圖次 VII 表次 IX 第一章 緒論 1 1-1 海洋清除現象與釷-234、鉛-210和釙-210 1 1-2 近岸海域清除作用文獻回顧 3 1-3 研究區域 4 1-4 研究目的 5 第二章 採樣與實驗分析 7 2-1 採樣與前處理 7 2-2 實驗與分析方法 8 2-2.1 釙-210 8 2-2.1.1 釙-210溶解相分析方法 8 2-2.1.2 釙-210顆粒相分析方法 8 2-2.2 鉛-210 9 2-2.3 釷-234 9 2-3 顆粒有機碳、葉綠素甲、營養鹽分析步驟 10 第三章 結果 11 3-1 台灣西北近岸海域表水的溫鹽變化與營養鹽分佈 11 3-2 台灣西北近岸海域表水中顆粒濃度與成分空間變化 11 3-3 釷-234、鉛-210和釙-210在台灣西北近岸的分佈狀態 12 第四章 討論 21 4-1 母子核種間的不平衡現象 21 4-2 釷-234、鉛-210和釙-210的親顆粒性 24 4-3 釷-234、鉛-210和釙-210的重量活度與顆粒體的組成關係 27 4-4 釷-234、鉛-210和釙-210的清除速率與滯留時間 28 4-5 顆粒有機碳輸出通量 32 第五章 結論 40 參考文獻 42 | |
| dc.language.iso | zh-TW | |
| dc.title | 台灣西北近岸環境中釷-234、鉛-210和釙-210的地化特性比較 | zh_TW |
| dc.title | Comparative Geochemical of 234Th, 210Pb, and 210Po in the Nearshore Waters off Northwestern Taiwan | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 101-1 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 洪慶章(Chin-Chang Hung),溫良碩 | |
| dc.subject.keyword | 清除作用,234Th,210Pb,210Po,移除速率,滯留時間,顆粒有機碳, | zh_TW |
| dc.subject.keyword | scavenging,234Th,210Pb,210Po,removal rate,residence time,particulate organic carbon, | en |
| dc.relation.page | 50 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2013-02-05 | |
| dc.contributor.author-college | 理學院 | zh_TW |
| dc.contributor.author-dept | 海洋研究所 | zh_TW |
| 顯示於系所單位： | 海洋研究所 | |
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