| 长江口盐度梯度下不同形态碳的分布、来源与混合行为 |
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| 引用本文： | 叶君,姚鹏,徐亚宏,王金鹏,赵彬.长江口盐度梯度下不同形态碳的分布、来源与混合行为[J].海洋学报,2019,41(4):15-26. |
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| 作者姓名： | 叶君 姚鹏 徐亚宏 王金鹏 赵彬 |
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| 作者单位： | 海洋化学理论与工程技术教育部重点实验室,山东 青岛,266100;海洋化学理论与工程技术教育部重点实验室,山东 青岛 266100;青岛海洋科学与技术试点国家实验室 海洋生态与环境科学功能实验室,山东 青岛 266071;青岛海洋科学与技术试点国家实验室 海洋高端装备联合实验室(中船重工集团部分),山东 青岛,266071 |
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| 基金项目： | 国家重点研发计划项目（2016YFA0600902）；国家自然科学基金项目（41676063，41620104001，41521064）。 |
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| 摘 要： | 河口碳的生物地球化学过程是全球碳循环的重要组成。通过测定溶解无机碳（DIC）及其稳定同位素丰度（δ13CDIC），溶解有机碳（DOC），有色溶解有机物（CDOM），颗粒有机碳（POC）及其稳定同位素丰度（δ13CPOC）与元素比值（N/C）及相关指标，研究了2014年7月长江口盐度梯度下不同形态碳的分布、来源和混合行为。结果表明，DIC浓度、DOC浓度、POC含量分别为1 583.2~1 739.6 μmol/L，128.4~369.4 μmol/L和51.2~530.8 μmol/L，这些不同形态碳及CDOM的荧光组分的分布模式相似，均是从口内到口外，整体呈现先增大后减小的趋势，并与盐度呈现非保守混合行为。添加作用主要发生在在口门处最大浑浊带附近。与含量相反，从口内到口外，δ13CDIC和δ13CPOC均呈现逐渐减小再增大的趋势，在口门附近达到最低值，分别为-9.7‰和-26.7‰。在口门附近不同形态碳含量上升及δ13CDIC、δ13CPOC的降低可能主要与沉积物再悬浮及微生物作用有关。基于蒙特卡洛模拟的三端元混合模型的结果显示，河口内外POC来源变化明显，口内POC以陆源有机碳贡献为主，平均为62.3%，口外海源贡献逐渐增加。CDOM相关参数结果表明长江口CDOM主要来自陆源输入，海源及人类活动等也对其产生影响。
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| 关 键 词： | 长江口 最大浑浊带 无机碳 有机碳 同位素 有色溶解有机物 |
| 收稿时间： | 2018/5/4 0:00:00 |
| 修稿时间： | 2018/7/9 0:00:00 |
Distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary |
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| Ye Jun,Yao Peng,Xu Yahong,Wang Jinpeng and Zhao Bin.Distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary[J].Acta Oceanologica Sinica (in Chinese),2019,41(4):15-26. |
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| Authors: | Ye Jun Yao Peng Xu Yahong Wang Jinpeng and Zhao Bin |
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| Institution: | 1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, China2.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Qingdao 266100, China;Marine Ecology and Environmental Science Laboratory, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China3.Joint Laboratory for Maritime Equipment Technology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China |
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| Abstract: | The biogeochemical processes of carbon in estuaries are an important part of global carbon cycle. Dissolved inorganic carbon (DIC), stable carbon isotopic abundance of (δ13CDIC), dissolved organic carbon (DOC), chromophoric dissolved organic matter (CDOM), particle organic carbon (POC), stable carbon isotopic abundance of POC (δ13CPOC), atomic element ratios (N/C) and other related parameters were analyzed in order to study the distribution, sources and mixing behavior of different carbon species along a salinity gradient in the Changjiang Estuary in July 2014. The concentrations of DIC, DOC and POC range from 1 583.2 to 1 739.6 μmol/L, 128.4 to 369.4 μmol/L, 51.2 to 530.8 μmol/L, respectively. Similar with CDOM, these carbon species increase first and then decrease from the inner estuary to outer estuary, showing non-conservative mixing behaviors with salinity. The addition behavior of these carbon species mostly occurs in the turbidity maximum zone. In contrast, the values of δ13CDIC and δ13CPOC first decrease and then increase from the inner estuary to outer estuary, with the minimum values are found in the river mouth (-9.7‰ and -26.7‰, respectively). The increasing of carbon concentrations and decreasing of δ13CDIC, δ13CPOC values near the river mouth could be attributed to sediment re-suspension and/or microbial processes. The results of a three end-member mixing model based on Monte-Carlo Simulation indicate that the sources of POC vary greatly from the inner estuary to outer estuary. Terrestrial organic carbon is the main source of POC in the inner estuary, with the average value of 62.3%, whereas contribution of marine organic carbon gradually increase in the outer estuary. The results of CDOM related parameters show that the CDOM is mainly derived from terrestrial input, however, marine sources and human activities may also have impacts in the Changjiang Estuary. |
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| Keywords: | Changjiang Estuary Turbidity Maximum Zone inorganic carbon (IC) organic carbon (OC) isotope chromophoric dissolved organic matter (CDOM) |
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