| 摘要: |
| 在1993和1994年两个航次中，利用震动式取样器从东海陆架取得3个柱状岩芯样品。对其进行了POC，PIC，PON含量和粒度分析，并同其上覆水体的POC，PIC以及总颗粒物的垂直通量和悬浮体作了比较。结果表明，东海海底表层沉积物中的总碳含量中陆架冷涡泥质区最高，浙江近岸泥质区次之，中陆架砂质区最低。PIC含量均大于POC。中陆架砂质区海底沉积物缺乏碳的保存条件，在生物大量繁殖期（夏半季）许多颗粒碳可从水体转入海底沉积物，在非生物繁殖期的冬半季；可能主要表现为去碳作用，年尺度上海底沉积物-海水间面碳的收支处于动态平衡，固碳作用有限。中陆架冷涡泥质区和浙江近岸泥质区海底沉积物具有良好的碳保存条件，是东海海底固定碳的“汇”。近岸泥质区固定的碳量远高于中陆架冷涡泥质区。水体中生物作用生成颗粒碳的“汇”并非都与海底沉积物固定碳的“汇”相吻合。 |
| 关键词: 颗粒碳 垂直转移过程 颗粒碳汇 东海 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金!49636210 |
附件 |
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| VERTICAL TRANSFER PROCESSES FOR THE PARTICULATE CARBON IN THE EAST CHINA SEA |
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Guo Zhigang, Yang Zuosheng
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College of Marine Geosciences, Ocean University of Qingdao, Qingdao 266003
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| Abstract: |
| Three cores in three typical areas of the East China Sea, including St 111 from the cold eddy mud area in the middle continental shelf, St. 410 from the
middle continental shelf sand area, and St. 403 from the Zhejiang coastal mud area, were taken using a vibro-corer during the Chinese JGOFS Cruises supported by the Natural Science Foundation of China in 1993 and 1994 respectively. The contents of particulate organic carbon (POC), particulate inorganic carbon (PIC), particulate organic nitrogen (PON) and grain size from the three cores were analyzed. Their relation to the vertical fluxes of suspended particulate matter (SPM), POC and PIC, and the composition and concentrations of total suspended matter in the seawater at St. 111 and St. 410 were discussed. The results indicate that the content of PIC in the surface sediments is higher than those of POC. Although there is a considerable high vertical flux of particulate carbon (PC) in the bottom seawater at St. 410, the maintenance of PC in the surface sediments is almost impossible due to the low depositional rate, relatively high energy dynamic condition, and oxidative environment of the sea-floor in that area. The PC may be transferred from the seawater to the surface sediments during the blooming season (i. e. the summer) of marine organisms, but part of them will be transferred back to the seawater again. Possibly, surface sediments dominate in the dis-carbon process during the winter. Therefore, the budget of PC on the sea-floor sediment-seawater interface is in dynamic equilibrium, making the contribution of carbon's catch very limited in the middle continental shelf sand area. The cold eddy mud area and Zhejiang coastal mud area are the PC sinks since the two areas have relatively high vertical fluxes of PC and the conditions for PC's maintenance on the surface sediments are satisfied. The catch amount of carbon in the Zhejiang coastal mud area is much more than that of the cold eddy mud area because the former has a much higher depositional rate. The PC sinks in the seawater controlled by the marine organism production and other carbon origins do not always coincide with the PC sinks of the sea-floor surface sediments in the East China Sea. |
| Key words: Particulate carbon, Vertical transfer processes, Particulate carbon sink, The East China Sea |
