【摘要】：根據(jù)2009年和2014年夏季在乳山灣口及鄰近海域的綜合調(diào)查結(jié)果,分析了該海域夏季有機(jī)碳的時(shí)空分布、底界面過(guò)程與影響因素.結(jié)果表明,2009年夏季乳山灣近海水體溶解有機(jī)碳(DOC)含量介于0.70~3.19mg/L之間,平均值為1.80mg/L;DOC的平均值在8月最高,7月與9月次之,6月最低;2014年8月份DOC的變化范圍為1.79~15.2mg/L,高于2009年同期水平,顆粒有機(jī)碳(POC)的變化范圍為0.04~1.33mg/L;水體有機(jī)碳的分布受陸源輸入、海洋初級(jí)生產(chǎn)以及潮汐的顯著影響.研究區(qū)域夏季顆粒有機(jī)碳(POC)的沉降通量為(25±0.8)g/m~2,約占初級(jí)生產(chǎn)固碳量的66%;沉積物上層(0~4cm)間隙水中DOC的濃度是沉積物上覆水的8~9倍,DOC在沉積物—水界面存在向上覆水釋放的現(xiàn)象;乳山灣灣口DOC交換通量為14.4 97g/(m~2·a),占水體存量的1.1%~13.4%.人類(lèi)活動(dòng)一定程度上影響了乳山灣及其近海有機(jī)碳的構(gòu)成與循環(huán)收支過(guò)程,是區(qū)域環(huán)境變化的重要驅(qū)動(dòng)因子之一.有超過(guò)50%的有機(jī)碳會(huì)隨潮流輸送到外海,顯示潮流在有機(jī)碳輸送中巨大作用;沉積物-水界面DOC的交換會(huì)影響底界面有機(jī)碳的收支與循環(huán)過(guò)程,有機(jī)碳的收支表明研究海域底界面有機(jī)碳的降解所產(chǎn)生的溶解有機(jī)碳是水體DOC的重要來(lái)源,最終保存在沉積物中的碳其埋藏量約占初級(jí)生產(chǎn)的13%;相對(duì)較低的溶解氧水平可能會(huì)增加DOC的交換通量,影響碳在陸架邊緣海的埋藏.
[Abstract]:Based on the results of a comprehensive survey in 2009 and 2014 in the Rushan Bay estuary and adjacent sea areas, the spatial and temporal distribution of organic carbon in summer, the bottom interface process and the influencing factors were analyzed. The results showed that the content of dissolved organic carbon (DOC) in the coastal waters of Rushan Bay in summer 2009 was between 0.70~3.19mg/L and the average value was 1.80 mg / L in August, followed by July and September, and the lowest in June. The change range of DOC in August 2014 was 1.79 ~ 15.2 mg / L, which was higher than that in the same period of 2009. The range of particulate organic carbon (POC) was 0.04 ~ 1.33 mg / L; The distribution of organic carbon in water is significantly affected by terrestrial inputs, marine primary production and tides. The deposition flux of particulate organic carbon (POC) in summer was (25 鹵0.8) g / m ~ (2), accounting for 66% of carbon sequestration in primary production. The concentration of DOC in the upper layer (0~4cm) interstitial water was 89 times higher than that in the sediment overlying water, and DOC was released to the overlying water at the sediment-water interface. The exchange flux of DOC at the mouth of Rushan Bay is 14. 4 97g/ (1. 1% of the total water stock with mt2 a),) and 13. 4%. Human activities, to some extent, affect the composition and circulation of organic carbon in Rushan Bay and its offshore waters, and are one of the important driving factors of regional environmental change. More than 50% of the organic carbon is transported to the sea with the tidal current, indicating that the tidal current plays an important role in the organic carbon transport. The exchange of DOC at the sediment-water interface will affect the budget and cycling of organic carbon at the bottom interface. The budget of organic carbon indicates that the dissolved organic carbon produced by the degradation of organic carbon in the bottom interface of the sea area is an important source of DOC in the water body. The amount of carbon stored in sediments accounts for about 13% of primary production. The relatively low dissolved oxygen level may increase the exchange flux of DOC and affect the burial of carbon in the marginal sea of continental shelf.
【作者單位】： 國(guó)家海洋局第一海洋研究所海洋生態(tài)研究中心;國(guó)家海洋局第一海洋研究所海洋地質(zhì)與地球物理研究室;
【基金】：中央級(jí)公益性科研院所基本科研業(yè)務(wù)費(fèi)專(zhuān)項(xiàng)(GY0216Q03) 國(guó)家自然科學(xué)基金(41376093,41106072)
【分類(lèi)號(hào)】：P734;X145

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