| 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 |
| |
| 引用本文： | 贾仁明,牟新悦,陈敏,朱晶,王博,李晓鹏,Astakhov A S,郑敏芳,邱雨生.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[J].海洋学报(英文版),2020,39(9):96-108. |
| |
| 作者姓名： | 贾仁明 牟新悦 陈敏 朱晶 王博 李晓鹏 Astakhov A S 郑敏芳 邱雨生 |
| |
| 作者单位： | 厦门大学海洋与地球学院, 中国厦门, 361005;俄罗斯科学院远东分院太平洋海洋研究所, 俄罗斯符拉迪沃斯托克, 690041 |
| |
| 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. |
| |
| 摘 要： | The stable isotopic composition(δ~(13)C and δ~(15)N) 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 δ~(13)C_(POC) values were in the range of -29.5‰ to-17.5‰ with an average of -25.9‰±2.0‰, and the δ~(15)N_(PN) 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 δ~(13)C and δ~(15)N values were just the opposite. Abnormally low C/N ratios(4), low δ~(13)C_(POC)(almost-28‰) and high δ~(15)N_(PN)(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.
|
| 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 |
| 收稿时间： | 2019/7/17 0:00:00 |
Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes |
| |
| Jia Renming,Mu Xinyue,Chen Min,Zhu Jing,Wang Bo,Li Xiaopeng,Astakhov A S,Zheng Minfang,Qiu Yusheng.Sources of particulate organic matter in the Chukchi and Siberian shelves: clues from carbon and nitrogen isotopes[J].Acta Oceanologica Sinica,2020,39(9):96-108. |
| |
| Authors: | Jia Renming Mu Xinyue Chen Min Zhu Jing Wang Bo Li Xiaopeng Astakhov A S Zheng Minfang Qiu Yusheng |
| |
| Institution: | 1.College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, China2.V.I. Il’ichev Pacific Oceanological Institute, Far Eastern Branch, Russian Academy of Sciences, Vladivostok 690041, Russia |
| |
| 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. |
| |
| Keywords: | particulate organic matter carbon isotope nitrogen isotope Chukchi Shelf East Siberian Shelf polynya |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《海洋学报(英文版)》浏览原始摘要信息 |
| 点击此处可从《海洋学报(英文版)》下载免费的PDF全文 |
|
