| Jia Renming,Mu Xinyue,Chen Min,Zhu Jing,Wang Bo,Li Xiaopeng,Astakhov A S,Zheng Minfang,Qiu Yusheng. 2020. Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes. Acta Oceanologica Sinica, 39(9):96－108 |
| Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes |
| 楚科奇和西伯利亚陆架颗粒有机物的来源：碳、氮同位素的线索 |
| Received:July 17, 2019 |
| DOI：10.1007/s13131-020-1650-9 |
| Key words:particulate organic matter carbon isotope nitrogen isotope Chukchi Shelf East Siberian Shelf polynya |
| 中文关键词: 颗粒有机物 碳同位素 氮同位素 楚科奇陆架 西伯利亚陆架 冰间湖 |
| 基金项目:The National Natural Science Foundation of China under contract No. 41721005; the China Ocean Mineral Resources R&D Association (COMRA) Program under contract No. DY135-E2-2-03; the Marine S&T Fund of Shandong Province for Pilot National Laboratory for Marine Science and Technology under contract No. 2018SDKJ0104-3; the Ministry of Science and Education of Russia Project under contract No. АААА-А17-117030110033-0. |
| Author Name | Affiliation | E-mail | | Jia Renming | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | Mu Xinyue | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | Chen Min | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | mchen@xmu.edu.cn | | Zhu Jing | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | Wang Bo | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | Li Xiaopeng | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | Astakhov A S | V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia | | | Zheng Minfang | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | | | Qiu Yusheng | College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China | |
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| Abstract: |
| The stable isotopic composition (δ13C and δ15N) and carbon/nitrogen ratio (C/N) of particulate organic matter (POM) in the Chukchi and East Siberian shelves from July to September, 2016 were measured to evaluate the spatial variability and origin of POM. The δ13CPOC values were in the range of -29.5‰ to -17.5‰ with an average of -25.9‰±2.0‰, and the δ15NPN values ranged from 3.9‰ to 13.1‰ with an average of 8.0‰±1.6‰. The C/N ratios in the East Siberian shelf were generally higher than those in the Chukchi shelf, while the δ13C and δ15N values were just the opposite. Abnormally low C/N ratios (<4), low δ13CPOC (almost -28‰) and high δ15NPN (>10‰) values were observed in the Wrangel Island polynya, which was attributed to the early bloom of small phytoplankton. The contributions of terrestrial POM, bloom-produced POM and non-bloom marine POM were estimated using a three end-member mixing model. The spatial distribution of terrestrial POM showed a high fraction in the East Siberian shelf and decreased eastward, indicating the influence of Russian rivers. The distribution of non-bloom marine POM showed a high fraction in the Chukchi shelf with the highest fraction occurring in the Bering Strait and decreased westward, suggesting the stimulation of biological production by the Pacific inflow in the Chukchi shelf. The fractions of bloom-produced POM were highest in the winter polynya and gradually decreased toward the periphery. A negative relationship between the bloom-produced POM and the sea ice meltwater inventory was observed, indicating that the net sea ice loss promotes early bloom in the polynya. Given the high fraction of bloom-produced POM, the early bloom of phytoplankton in the polynyas may play an important role on marine production and POM export in the Arctic shelves. |
| 中文摘要: |
| 为了揭示楚科奇海和东西伯利亚海颗粒有机物（POM）的来源及空间分布规律，本研究采集并分析了2016年7-9月楚科奇海和西伯利亚海陆架区POM的碳、氮同位素组成（δ13C和δ15N）和碳氮原子比（C/N比）。POM的δ13C值介于-29.5‰至-17.5‰之间，平均为-25.94 ±1.97‰；δ15N值介于3.9‰至13.1‰之间，平均为8.03 ±1.56‰。POM的C/N比总体上表现出西伯利亚陆架高于楚科奇陆架的特征，而δ13C和δ15N值则出现相反的分布趋势。在Wrangel岛冰间湖区出现C/N比和δ13C的异常低值（C/N比小于4，δ13C值约为-28‰）和δ15N的异常高值（δ15N值大于10‰），反映了冰间湖小型藻类早期水华的影响。研究中利用三端元混合模型计算了陆源POM、早期水华所产生POM和非水华生源POM的贡献。陆源POM的贡献在东西伯利亚陆架区较高，并呈现向东降低的趋势，与俄罗斯河流输入的影响有关。非水华生源POM的贡献在楚科奇陆架区较高，并呈现向西降低的趋势，最高值出现在白令海峡附近海域，反映了太平洋入流对楚科奇海生物生产力的刺激作用。早期水华所产生POM的贡献在冰间湖区最高，并向周围海域逐渐降低。研究中发现早期水华所产生POM的贡献与海冰融化水储量之间存在负相关关系，证明海冰的净损失促进了冰间湖早期水华的发生。由于楚科奇和西伯利亚陆架区水华所产生POM的贡献较高，因此冰间湖藻类的早期水华对于北极陆架海域的初级生产力和POM输出可能有着重要影响。 |
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