| Gao Meng,Huang Baoqi,Liu Zhifei,Zhao Yulong,Zhang Yanwei. 2020. Observations of marine snow and fecal pellets in a sediment trap mooring in the northern South China Sea. Acta Oceanologica Sinica, 39(3):141－147 |
| Observations of marine snow and fecal pellets in a sediment trap mooring in the northern South China Sea |
| 南海北部底层沉积物捕获器中海雪和生物粪粒组成及来源探究 |
| Received:May 23, 2019 |
| DOI：10.1007/s13131-020-1561-9 |
| Key words:northern South China Sea sediment trap marine snow fecal pellets |
| 中文关键词: 南海北部 沉积物捕获器 海雪 粪便颗粒 |
| 基金项目:The National Natural Science Foundation of China under contract Nos 91528304 and 41376043. |
| Author Name | Affiliation | E-mail | | Gao Meng | School of Earth and Space Sciences, Peking University, Beijing 100871, China | | | Huang Baoqi | School of Earth and Space Sciences, Peking University, Beijing 100871, China | bqhuang@pku.edu.cn | | Liu Zhifei | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | Zhao Yulong | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | | | Zhang Yanwei | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China | |
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| Abstract: |
| Sediment traps are an important tool for studying the source, composition and sedimentation processes of sinking particulate matter in the ocean. An in situ observational mooring (TJ-A-1) is located in the northern South China Sea (20.05°N, 117.42°E) at a water depth of 2 100 m and equipped with two sediment traps deployed at 500 m and 1 950 m. Samples were collected at 18-day intervals, and 20 samples were obtained at both depths from May 2014 to May 2015. Large amounts of fecal matter and marine snow were collected in the lower trap. The fluxes of marine snow and fecal pellets exhibited a fluctuating decrease between May 2014 and early August 2014 and then stabilized at a relatively low level. Scanning electron microscopy observations revealed that the main components of the marine snow and fecal pellets were diatoms, coccolithophores, radiolarians, and other debris, all of which are planktons mostly produced in photic zone. Used in conjunction with the particle collection range estimates from the lower trap and data on ocean surface chlorophyll, these marine snow and fecal pellets were related to the lateral transport of deep water and not vertical migrations from overlying water column. Moreover, the source area might be southwest of Taiwan. |
| 中文摘要: |
| 沉积物捕获器是研究海洋中颗粒物质的来源、组成和沉降过程的重要工具。时间系列沉积物捕获器TJ-A-1位于南海北部（117.42°E，20.05°N，水深2100米），在500米和1950米处分别布置捕获器。样品收集的时间间隔为18天，从2014年5月到2015年5月两个深度的捕获器分别收集到20个样品，在底层沉积物捕获器样品中收集到大量海雪和海洋生物产生的粪便颗粒。2014年5月到2014年8月初期间，海雪和粪粒的通量呈现波动性下降趋势，2014年8月到2015年5月，通量稳定在相对较低水平。扫描电镜观察显示，海雪和粪粒的主要成分是硅藻、颗石藻、放射虫等碎片，均为来自海水上部真光层的浮游动生物。结合底层捕获器收集颗粒物质来源的计算和海洋表面的叶绿素数据，推断TJ-A-1站位2014-2015年底层海雪和粪便颗粒的来源并非垂直沉降，可能与南海北部深层海水的侧向搬运有关，其来源区域可能是台湾岛西南海区。 |
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