| 基于ADCP回声的黑潮-亲潮混合区浮游动物昼夜垂直迁移研究 |
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| 引用本文： | 李琦,陈朝晖.基于ADCP回声的黑潮-亲潮混合区浮游动物昼夜垂直迁移研究[J].海洋与湖沼,2022,53(2):305-319. |
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| 作者姓名： | 李琦 陈朝晖 |
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| 作者单位： | 中国海洋大学 深海圈层与地球系统前沿科学中心/物理海洋教育部重点实验室 山东青岛 266100,中国海洋大学 深海圈层与地球系统前沿科学中心/物理海洋教育部重点实验室 山东青岛 266100;青岛海洋科学与技术试点国家实验室 山东青岛 266237 |
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| 基金项目： | 中央高校基本科研业务费专项,202172001号； |
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| 摘 要： | 利用深海潜标所搭载的声学多普勒流速剖面仪(acoustic doppler current profiler,ADCP)得到的后向散射强度Sv,研究了黑潮-亲潮混合区浮游动物的垂向分布、其昼夜垂直迁移(diel vertical migration;DVM)的基本特征、多时间尺度变化及对反气旋式中尺度暖涡的响应.结果表...
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| 关 键 词： | 声学多普勒流速剖面仪回声 黑潮-亲潮混合区 浮游动物昼夜垂直迁移 多时间尺度变化 中尺度涡 |
| 收稿时间： | 2021/10/18 0:00:00 |
| 修稿时间： | 2021/11/28 0:00:00 |
DIEL VERTIAL MIGRATION OF ZOOPLANKTON IN THE KUROSHIO-OYASHIO MIXED ZONE BASED ON ADCP ECHO |
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| LI Qi,CHEN Zhao-Hui.DIEL VERTIAL MIGRATION OF ZOOPLANKTON IN THE KUROSHIO-OYASHIO MIXED ZONE BASED ON ADCP ECHO[J].Oceanologia Et Limnologia Sinica,2022,53(2):305-319. |
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| Authors: | LI Qi CHEN Zhao-Hui |
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| Institution: | Frontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China; Frontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China;Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China |
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| Abstract: | The backscattering strength Sv is calculated with echo intensity measured by acoustic doppler current profilers (ADCPs) that are mounted on a subsurface mooring in the Kuroshio-Oyashio mixed zone. Based on Sv derived from ADCP, we studied the vertical distribution of zooplankton, the basic feature of its diel vertical migration (DVM), and the multi-time scale variations and response to anticyclonic warm-core mesoscale eddy of DVM. Results show that the zooplankton are mainly distributed in the upper layer above 200 m and the intermediate layer between 300 and 800 m. Zooplankton in the upper layer is controlled by phytoplankton, with high biomass in spring and autumn while low in summer and winter, and the depth of distribution is the shallowest in summer and gradually deepening from autumn to winter. Differently, zooplankton in the intermediate layer is closely related to water temperature, with its biomass and depth of distribution both elevated in spring and summer and decreased in autumn and winter. It was found that zooplankton show significant DVM behavior in the depth of 400 m, which is characterized by daytime sinking and nighttime floating, with the average mean DVM amplitude, duration and velocity of about 200 m, 2 h and 2.8 cm/s, respectively, and a instantaneous velocity as high as 9.0 cm/s. The DVM shows apparent multi-time scale variations. Affected by the biomass and vertical distribution of phytoplankton, the DVM intensity is the strongest in spring, second strorg in autumn and winter, and weak in summer, and the DVM amplitude is the largest in summer, second large in spring, and small in autumn and winter. The starting and ending time of DVM is controlled by the sunlight, and synchronously follows the change of sunset and sunrise, respectively. The intra-seasonal variation of DVM strength is correlated to the changes of water temperature and current. The DVM strength enhances (reduces) as the water temperature increases (decreases) and weakens as the horizontal current gets strong. Based on case analysis, it is first proposed that the warm eddies generally suppress DVM, with different influence on DVM in different parts of eddy: the strong horizontal current at the eddy periphery damp the DVM intensity, and the high temperature at the eddy center reduce DVM amplitude. The results in this paper fill in the gap of zooplankton DVM research in the Kuroshio-Oyashio mixed zone, and lays a foundation for the optimization of ecological model and the evaluation and prediction of fishery resources in this area. |
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| Keywords: | ADCP echo Kuroshio-Oyashio mixed zone diel vertical migration of zooplankton multi-time scale variations mesoscale eddy |
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