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| 苏北浅滩海底地下水排放及其对海域营养盐通量的贡献 |
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赵世彬1,2, 姚庆祯1,3, 于志刚1,3, 许博超1,3, 韦钦胜4, 南海明1,2
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1.中国海洋大学海洋化学理论与工程技术教育部重点实验室 青岛 266100;2.中国海洋大学化学化工学院 青岛 266100;3.青岛海洋科学与技术国家实验室海洋生态与环境科学功能实验室 青岛 266237;4.国家海洋局第一海洋研究所 青岛 266061
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| 摘要: |
| 海底地下水排放（SGD）是近海海域的一个重要的营养盐来源。本研究借助多种天然镭同位素对春季苏北浅滩海域的SGD及其携带入海的营养盐通量进行量化评估。研究发现：苏北浅滩海域的224Ra、223Ra和226Ra等镭同位素的浓度水平较高，呈现近岸高、远岸低的分布趋势；根据224Ra/226Ra的“表观年龄模型”估算的水龄的分布情况推断，春季该海域表层水体主体流向为东北向，流速约为0.1m/s，这与前人物理海洋数值模拟结果一致；最终利用226Ra质量平衡模型发现海域的SGD通量为（46±29） cm/d，由其携带入海的溶解态无机氮、磷、硅营养盐（DIN、DIP、DSi）等的通量分别为（2.6±3.1）×109、（3.0±2.5）×106和（5.5±4.2）×108mol/d。 |
| 关键词: 苏北浅滩 镭 水龄 海底地下水排放(SGD) 营养盐 |
| DOI：10.11693/hyhz20180700161 |
| 分类号: |
| 基金项目:鳌山科技创新计划项目，2016ASKJ02号；国家自然科学基金资助项目，41576075，41876075号。 |
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| SUBMARINE GROUNDWATER DISCHARGE AND ITS CONTRIBUTION TO NUTRIENTS FLUXES IN THE SUBEI SHOAL, CHINA |
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ZHAO Shi-Bin1,2, YAO Qing-Zhen1,3, YU Zhi-Gang1,3, XU Bo-Chao1,3, WEI Qin-Sheng4, NAN Hai-Ming1,2
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1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;2.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;3.Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China;4.First Institute of Oceanography, SOA, Qingdao 266061, China
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| Abstract: |
| Submarine groundwater discharge (SGD) is an important nutrients source in a coastal water. Using multiple natural radium isotopes, we quantitatively evaluated the SGD and its associated nutrient fluxes in the Subei coastal zones (Jiangsu, South China) in spring. The results show that the activities of 224Ra, 223Ra, and 226Ra in the study area were relatively high, presenting an increasing trend from nearshore to offshore. Based on the Apparent Radium Age Model with 224Ra/226Ra ratios, the distribution of water ages was portrayed, which indicated that the surface water mainly flowed to the northeast direction at~0.1m/s, which is consistent with a previously reported result of physical ocean numerical simulation. The SGD flux was (46±29)cm/d determined by a mass balance model of 226Ras. The SGD discharged nutrient fluxes of DIN, DIP and DSi were (2.6±3.1)×109, (3.0±2.5)×106 and (5.5±4.2)×108mol/d, respectively. |
| Key words: Subei shoal radium water ages submarine groundwater discharge (SGD) nutrients |