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研究生:謝鈞盛
論文名稱:不同海洋環境下不同粒徑沉降顆粒POC/ 234Th 比值之探討
論文名稱(外文):Ratios of POC and 234Th in different size classes of particles collected by sediment trap in different oceanic environments
指導教授:洪慶章洪慶章引用關係
指導教授(外文):Chin-Chang Hung
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:海洋環境化學與生態研究所
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:2010
畢業學年度:98
語文別:中文
論文頁數:55
中文關鍵詞:沉積物收集器顆粒性有機碳釷-234顆粒性有機碳與釷-234比值黑潮湧升區
外文關鍵詞:Sediment trapPOCTh-234POC/ Th-234 ratioKuroshioupwelling
相關次數:
  • 被引用被引用:2
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  • 下載下載:14
  • 收藏至我的研究室書目清單書目收藏:0
沉積物收集器是最直接量測顆粒性有機碳通量的方法。然而此方法會受到水動力、浮游動物及顆粒溶解的影響。除了沉積物收集器外,海洋學家也常用釷-234/ 鈾-238不平衡法來估算顆粒性有機碳通量(也就是以水體估算的釷-234通量乘以下沉顆粒之POC/ 234Th 比值)。然而,釷鈾不平衡法所推導的碳通量也產生了極大的誤差,主要是來自釷-234通量的估算與POC/ 234Th比值的選擇,其中,以POC/ 234Th比值對顆粒性有機碳通量的計算影響最大。傳統上幫浦過濾的大顆粒(>50 mm)是被假設為下沉顆粒,但是這個假設並沒有經過驗證。本研究於台灣東北湧升區與黑潮測站在不同季節的航次中,量測不同粒徑(1~10 mm, 10~50 mm, 50~150 mm, >150 mm, 本文定義<50 mm為小顆粒,>50 mm為大顆粒)沉降顆粒之顆粒性有機碳濃度與釷-234活度,發現小顆粒的碳通量與釷-234通量分別占沉降顆粒(bulk, > 1 mm)碳通量與釷-234通量的26~67 %與39~91 %,這與一般認為下沉顆粒被大顆粒 主導有很大的不同。除了碳與釷-234通量的數據外,在未經過連續過濾的沉降顆粒掃描式電顯圖片中也證實了小顆粒的存在。此外,POC/ 234Th比值在大顆粒的變化(湧升區:1.2~31.1, 黑潮:3.2~12.6)較小顆粒(湧升區:0.6~8.0, 黑潮:0.8~3.0)大,若是以大顆粒的POC/ 234Th 比值估算顆粒性有機碳通量可能會造成較大誤差。因此,本研究建議要選擇總沉降顆粒的POC/ 234Th比值來估算顆粒性有機碳的通量,而不是單單使用大顆粒的POC/ 234Th 比值去估算碳通量。
Sediment trap is directly used to determine particulate organic carbon (POC) flux, while the problem of zooplankton and the solubilization of material after collection. 234Th has been increasingly used as a tracer to estimate POC flux in the surface ocean using the product of the POC/ 234Th ratio from sinking particles (e.g. trap-collected) times the 234Th ratio flux. However, the 234Th-derived POC flux may be significantly biased due to two factors : large uncertainties in estimates of the 234Th flux, and the great variability of POC/ 234Th ratio. The POC/ 234Th ratio from large, pump- collected (>50 mm), particles are considered to be representative of sinking particles, but this hypothesis has not been thoroughly tested. In this study, we present POC and 234Th data for various particle size classes (>150, 50-150, 10-50 and 1-10 mm, (here in we defined <50 mm is the “small particle”, >50 mm is the “large particle”) from trap-collected particles in the upwelling region of northeastern Taiwan and the Kuroshio. Within the trap-collected POC pool, the small particles contained the largest proportion of POC (bulk, >1 mm)(26-67%) and 234Th (39-91%) fluxes. SEM images of bulk (without sequential filtration) sinking particles evidence that sinking particles contained many small particles. In variation of POC/ 234Th ratio in the large particle (upwelling area: 1.2~31.1, Kuroshio: 3.2~12.6) was higher than that of POC/ 234Th ratio in the small particle (upwelling area: 0.6~8.0, Kuroshio: 0.8~3.0). The results indicate that 234Th-derived POC flux will be significantly overestimated of POC/ 234Th ratio in the large particle is used. Therefore, we suggest that the POC/ 234Th ratio in bulk sinking particles should be used in estimating POC flux when using the 234Th approach.
致謝i
摘要iii
ABSTRACTv
目錄vii
圖目錄ix
表目錄x
第一章前言1
1.1顆粒性有機碳通量的重要性1
1.2研究現況2
1.3研究動機與目的5
1.4研究區域水文環境之介紹7
1.4.1台灣東北湧升區7
1.4.2黑潮區8
第二章材料與方法11
2.1研究區域與採樣項目11
2.2沉降顆粒之採集與分析11
第三章結果17
3.1沉降顆粒(bulk)之顆粒性有機碳通量與釷-234通量之變化17
3.2不同大小顆粒之顆粒性有機碳與釷-234通量19
3.3不同海域之沉降顆粒(bulk)的POC/ 234Th比值變化21
3.4不同海域之大小沉降顆粒的POC/ 234Th比值季節變化22
3.5有無添加毒藥對POC/ 234Th比值的影響23
第四章討論30
4.1連續過濾對顆粒特性之可能影響30
4.2沉降顆粒之顆粒大小分布(SEM) 31
4.3顆粒性有機碳通量之約束32
第五章結論38
參考文獻40

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