| WANG Huiwu,CHEN Hongxia,XUE Liang,LIU Na,LIU Yanliang. 2015. Zooplankton diel vertical migration and influence of upwelling on the biomass in the Chukchi Sea during summer. Acta Oceanologica Sinica, 34(5):68－74 |
| Zooplankton diel vertical migration and influence of upwelling on the biomass in the Chukchi Sea during summer |
| 2012年夏季楚科奇海浮游动物垂直迁移及上升流对其生物量的影响 |
| Received:August 20, 2014 Revised:January 30, 2015 |
| DOI：10.1007/s13131-015-0668-x |
| Key words:Chukchi Sea diel vertical migration zooplankton biomass upwelling |
| 中文关键词: 楚科奇海 垂直迁移 浮游动物生物量 上升流 |
| 基金项目:The Public Science and Technology Research Funds Projects of Ocean under contract Nos 201205007-1 and 201405031; Chinese Polar Environment Comprehensive Investigation and Assessment Programmes under contract Nos CHINARE-2014-03-01 and CHINARE2014-04-03; the Polar Science Strategic Research Foundation of China under contract No. JD201101 . |
| Author Name | Affiliation | E-mail | | WANG Huiwu | College of Physical and Enviromental Oceanography, Ocean University of China, Qingdao 266061, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | CHEN Hongxia | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | chenhx@fio.org.cn | | XUE Liang | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LIU Na | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | | | LIU Yanliang | First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China | |
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| Abstract: |
| The diel vertical migration (DVM) of zooplankton and the influence of upwelling on zooplankton biomass were examined using water column data of current velocity and mean volume backscattering strength (MVBS) collected by moored acoustic Doppler current profilers (ADCPs) deployed in the southeastern Chukchi Sea during the 5th Chinese National Arctic Research Expedition (CHINARE) in summer 2012, combined with the satellite observational data such as sea surface temperature (SST), wind, and chlorophyll a (Chl a). Hourly acoustic data were continuously collected for 49-d in the mooring site. Spectral analysis indicated that there were different migrating patterns of zooplankton, even though precisely classifying the zooplankton taxa was not available. The prevailing 24-h cycle corresponded to the normal DVM with zooplankton swimming upwards at sunrise and returning to deep waters at sunset. There was a clear DVM in the upper 17 m of the water column during the period with distinct day-night cycles, and no active DVM throughout the water column when the sun above the horizon (polar day), suggesting that light intensity was the trigger for DVM. Also there was a second migrating pattern with 12-h cycle. The upwelling event occurring in the northwest of Alaskan coastal area had important influence on zooplankton biomass at the mooring site. During the upwelling, the SST close to the mooring site dropped significantly from maximal 6.35℃ to minimal 1.31℃ within five days. Simultaneously, there was a rapid increase in the MVBS and Chl a level, suggesting the aggregation of zooplankton related to upwelling. |
| 中文摘要: |
| 基于中国第五次北极考察队2012年夏季在楚科奇海采用锚碇ADCP获取的海流和后向散射强度数据, 结合海表面温度、海面风场和海表面叶绿素浓度等卫星观测数据, 研究了观测海域是否存在浮游动物的垂直迁移, 并分析了可能影响其垂直迁移和动物量变化的外在环境因素。结果表明, 在研究海域仍然处于极昼期的观测初期, 浮游动物垂直迁移不明显。随后, 上层17米范围内清楚地观测到垂直迁移, 且其活动特性与每天的日出日落时刻表现出很好的一致性。这表明光线的强度变化是导致垂直迁移的主要因子。此外, 在观测末期, 浮游动物垂直迁移不明显但表层浮游动物有显著增加。通过分析阿拉斯加西北沿岸附近的风场数据, 发现该海域在8月底发生了一次上升流事件, 并持续了大约9天。该上升流事件通过将富含营养的冷水向楚科奇海的东北部输运, 致使该海域海表面温度显著降低、叶绿素浓度升高和浮游动物生物量的相应增加。 |
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