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研究生:林筱雨
研究生(外文):Hsiao-Yu Lin
論文名稱:南海北部輸出生產力季節變化:釷-234/鈾-238不平衡估算及沈降顆粒收集器量測
論文名稱(外文):Seasonal variation of export production in the northern South China Sea: 234Th/238U disequilibrium and floating trap approaches
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:2008
畢業學年度:97
語文別:中文
論文頁數:55
中文關鍵詞:南海時間序列研究234Th/238U不平衡法沈降顆粒收集器收集效率輸出生產力篩粒顆粒
外文關鍵詞:SEATS234Th/238U disequilibriumsediment traptrapping efficiencyexport productionsize-fractionated particles
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The time-series station, SEATS (18°N, 116°E) was visited four times during October 2006~October 2007 to carry out seawater sampling and floating trap deployments. This study is aimed to estimate and to directly measure export production using 234Th/238U disequilibrium and floating trap, respectively.
234Th fluxes in the euphotic layer estimated from the steady-state irreversible scavenging model showed small seasonal variation, which increased from 57 dpm/m2/d at 5 m to 1857 dpm/m2/d at 100 m in summer, 42 dpm/m2/d at 5 m to 1105 dpm/m2/d at 100 m in fall, and 161 dpm/m2/d at 5 m to 1584 dpm/m2/d at 100 m in winter.
The floating traps were deployed at three depths, i.e., mixed depth (30 m), euphotic depth (100 m), subsurface (160 m). Large variations of total mass fluxes and 234Th fluxes were found at the mixed depth, ranging from 441 mg/m2/d in summer to 3548 mg/m2/d in winter and from 353 dpm/m2/d in summer to 3395 dpm/m2/d in winter, respectively. In contrast to the fluxes at the mixed depth, the total mass and 234Th fluxes at the euphotic depth (100 m) fell in a smaller range, from 597 to 1215 mg/m2/d and from 1201 to 2108 dpm/m2/d, respectively.
Calculated from the ratio of measured 234Th fluxes and modeled 234Th fluxes, the trapping efficiencies of the floating traps at the euphotic depth (100 m) ranged from 0.8 to 1.3, giving a reliable POC fluxes measured by the floating trap. The POC flux at 100 m ranged from 9.8 mmol/m2/d in summer to 17.4 mmol/m2/d in fall. With trapping efficiency correction, POC fluxes ranged from 9.6 mmolC/m2/d in winter to 21.0 mmolC/m2/d in fall.
The ratio in the particles is the determining factor in using the 234Th/238U disequilibria to estimate export flux. In order to investigate the relationship of ratio with different particle size, this study measured POC and particulate 234Th contents in size-fractionated particles (0.45-10 μm, 10-63 μm, 63-153 μm, >153 μm). The results showed that the ratio in 0.45-10 μm particles is close to that in the sinking particles, from which the POC flux was calculated. Using 234Th as a carbon proxy, the POC flux at the euphotic depth ranged from 10.6 mmolC/m2/d in summer to 25.4 mmolC/m2/d in fall.
口試委員會審定書 i
致謝 ii
摘要 iii
Abstract iv
目次 v
表次 vii
圖次 viii
第一章 緒論 1
1.1 南海時間序列研究簡介 1
1.2 南海環境背景概述 2
1.3 生物群落結構 2
1.4 輸出生產力 3
1.5 釷-234:顆粒有機碳示蹤劑 4
1.6 研究目的 5
第二章 分析方法 8
2.1 採樣與前處理 8
2.1.1 航次資訊 8
2.1.2 採水 8
2.1.3 顆粒體 8
2.1.3.1 過濾 8
2.1.3.2 顆粒篩集器 9
2.1.3.3 沈降顆粒收集器 9
2.2 分析工作 10
2.2.1 釷-234 10
2.2.1.1 溶解相 10
2.2.1.2 顆粒相 10
2.2.1.2.1 懸浮顆粒 (>0.45 μm) 10
2.2.1.2.2 篩粒顆粒 (0.45-10 μm, 10-63 μm, 63-153 μm, >153 μm) 10
2.2.1.2.3 沈降顆粒 11
2.2.2 顆粒有機碳與無機碳 11
2.2.2.1懸浮顆粒 (>0.45 μm) 11
2.2.2.2篩粒顆粒 (0.45-10 μm, 10-63 μm, 63-153 μm, >153 μm) 11
2.2.2.3沈降顆粒 11
第三章 結果 12
3.1 水文參數 12
3.2 生物參數 12
3.3 釷-234分佈 13
3.4 釷-234於篩粒顆粒分佈 13
3.5 沈降顆粒收集器量測結果 14
第四章 討論 29
4.1 清除模式 29
4.2 沈降顆粒收集器之收集效率 30
4.3 顆粒有機碳輸出通量 31
4.4 總懸浮顆粒、篩粒顆粒及沈降顆粒之比較 33
4.5 顆粒體、顆粒相234Th及POC於光透層之滯留時間 35
第五章 結論 46
參考文獻 47
附錄 53
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